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Printing Semiconductor-Insulator Polymer Bilayers for High-Performance Coplanar Field-Effect Transistors EI SCIE PubMed Scopus
期刊论文 | 2018 , 30 (2) | ADVANCED MATERIALS
WoS CC Cited Count: 4
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Abstract :

Source-semiconductor-drain coplanar transistors with an organic semiconductor layer located within the same plane of source/drain electrodes are attractive for next-generation electronics, because they could be used to reduce material consumption, minimize parasitic leakage current, avoid crosstalk among different devices, and simplify the fabrication process of circuits. Here, a one-step, drop-casting-like printing method to realize a coplanar transistor using a model semiconductor/insulator [poly(3-hexylthiophene) (P3HT)/ polystyrene (PS)] blend is developed. By manipulating the solution dewetting dynamics on the metal electrode and SiO2 dielectric, the solution within the channel region is selectively confined, and thus make the top surface of source/drain electrodes completely free of polymers. Subsequently, during solvent evaporation, vertical phase separation between P3HT and PS leads to a semiconductor-insulator bilayer structure, contributing to an improved transistor performance. Moreover, this coplanar transistor with semiconductor- insulator bilayer structure is an ideal system for injecting charges into the insulator via gate-stress, and the thus-formed PS electret layer acts as a "nonuniform floating gate" to tune the threshold voltage and effective mobility of the transistors. Effective field-effect mobility higher than 1 cm(2) V-1 s(-1) with an on/off ratio > 10(7) is realized, and the performances are comparable to those of commercial amorphous silicon transistors. This coplanar transistor simplifies the fabrication process of corresponding circuits.

Keyword :

polymer blends organic electronics coplanar transistors printing vertical phase separation

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GB/T 7714 Bu, Laju , Hu, Mengxing , Lu, Wanlong et al. Printing Semiconductor-Insulator Polymer Bilayers for High-Performance Coplanar Field-Effect Transistors [J]. | ADVANCED MATERIALS , 2018 , 30 (2) .
MLA Bu, Laju et al. "Printing Semiconductor-Insulator Polymer Bilayers for High-Performance Coplanar Field-Effect Transistors" . | ADVANCED MATERIALS 30 . 2 (2018) .
APA Bu, Laju , Hu, Mengxing , Lu, Wanlong , Wang, Ziyu , Lu, Guanghao . Printing Semiconductor-Insulator Polymer Bilayers for High-Performance Coplanar Field-Effect Transistors . | ADVANCED MATERIALS , 2018 , 30 (2) .
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Dopant/Semiconductor/Electret Trilayer Architecture for High-Performance Organic Field-Effect Transistors EI SCIE Scopus
期刊论文 | 2018 , 4 (9) | ADVANCED ELECTRONIC MATERIALS
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Abstract :

Polycrystalline organic semiconductors are widely used for thin-film organic electronics; however, such films are usually featured with charge traps due to various crystalline defects and domain boundaries. Chemical doping and applying external electric field are two representative methods to fill traps and induce free charges to modulate charge transport behaviors. However, for organic field-effect transistors (OFETs) with high threshold voltages usually induced by charge traps, increasing doping concentration and electric field are frequently inaccessible, energy-consuming, or even deteriorative to device performance. In this work, using the organic semiconductor 2,7-dialkyl[1]benzothieno[3,2-b][1]benzothiophene, a combined approach is proposed to synergistically utilize chemical doping and electret induced electric potential for OFET applications, via constructing dopant/semiconductor/electret trilayer architecture. Charges induced by dopant are mainly confined near the dopant/semicondcutor interface, while electrostatic field provided by electret accumulates/depletes charges near semiconductor/electret interface. Although both of doping concentration and charge density in electret are relatively low, which is crucial to warrant high-performance stable device, the performance of the OFETs is greatly modulated. Moreover, the dopant/semiconductor/electret trilayer structure is optically transparent. Using this method, high-performance OFETs with field-effect mobility of approximate to 6 cm(2) V-1 s(-1), subthreshold-swing of 0.3 V decade(-1), on-off ratio exceeding 10(6), and tunable threshold voltages are realized.

Keyword :

electrets doping organic semiconductors low voltage devices organic field-effect transistors

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GB/T 7714 Wei, Peng , Hu, Yupeng , Zhu, Yuanwei et al. Dopant/Semiconductor/Electret Trilayer Architecture for High-Performance Organic Field-Effect Transistors [J]. | ADVANCED ELECTRONIC MATERIALS , 2018 , 4 (9) .
MLA Wei, Peng et al. "Dopant/Semiconductor/Electret Trilayer Architecture for High-Performance Organic Field-Effect Transistors" . | ADVANCED ELECTRONIC MATERIALS 4 . 9 (2018) .
APA Wei, Peng , Hu, Yupeng , Zhu, Yuanwei , Jiang, Yihang , Feng, Xiaoshan , Li, Shengtao et al. Dopant/Semiconductor/Electret Trilayer Architecture for High-Performance Organic Field-Effect Transistors . | ADVANCED ELECTRONIC MATERIALS , 2018 , 4 (9) .
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Reconstructing Space- and Energy-Dependent Exciton Generation in Solution-Processed Inverted Organic Solar Cells EI SCIE PubMed Scopus
期刊论文 | 2018 , 10 (16) , 13741-13747 | ACS APPLIED MATERIALS & INTERFACES
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Abstract :

Photon absorption-induced exciton generation plays an important role in determining the photovoltaic properties of donor/acceptor organic solar cells with an inverted architecture. However, the reconstruction of light harvesting and thus exciton generation at different locations within organic inverted device are still not well resolved. Here, we investigate the film depth-dependent light absorption spectra in a small molecule donor/acceptor film. Including depth-dependent spectra into an optical transfer matrix method allows us to reconstruct both film depth- and energy-dependent exciton generation profiles, using which short-circuit current and external quantum efficiency of the inverted device are simulated and compared with the experimental measurements. The film depth-dependent spectroscopy, from which we are able to simultaneously reconstruct light harvesting profile, depth-dependent composition distribution, and vertical energy level variations, provides insights into photovoltaic process. In combination with appropriate material processing methods and device architecture, the method proposed in this work will help optimizing film depth-dependent optical/electronic properties for high-performance solar cells.

Keyword :

optical simulation inverted devices organic photovoltaics light absorption small molecule solar cells vertical phase separation

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GB/T 7714 Wang, Yuheng , Zhang, Yajie , Lu, Guanghao et al. Reconstructing Space- and Energy-Dependent Exciton Generation in Solution-Processed Inverted Organic Solar Cells [J]. | ACS APPLIED MATERIALS & INTERFACES , 2018 , 10 (16) : 13741-13747 .
MLA Wang, Yuheng et al. "Reconstructing Space- and Energy-Dependent Exciton Generation in Solution-Processed Inverted Organic Solar Cells" . | ACS APPLIED MATERIALS & INTERFACES 10 . 16 (2018) : 13741-13747 .
APA Wang, Yuheng , Zhang, Yajie , Lu, Guanghao , Feng, Xiaoshan , Xiao, Tong , Xie, Jing et al. Reconstructing Space- and Energy-Dependent Exciton Generation in Solution-Processed Inverted Organic Solar Cells . | ACS APPLIED MATERIALS & INTERFACES , 2018 , 10 (16) , 13741-13747 .
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Regulating the vertical phase distribution by fullerene-derivative in high performance ternary organic solar cells EI SCIE Scopus
期刊论文 | 2018 , 46 , 81-90 | NANO ENERGY
WoS CC Cited Count: 4
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Abstract :

The vertical phase distribution of components in bulk heterojunction is diversified in organic solar cells (OSCs). The electron donors (acceptors) can be accumulated (depleted) at the interface of active layer and charge extraction layer. The variation of vertical phase distribution significantly influences device performance because of its impact on the charge transport and charge recombination. In order to achieve favorable vertical phase distribution in OSCs based on poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene))-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl) benzo[1,2-c:4,5-c']dithiophene-4,8-dione)] (PBDB-T):3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']-dithiophene (ITIC), phenyl-C71-butyric-acid-methyl ester (PC71BM) was incorporated into the binary system to fabricate ternary OSCs. In the ternary blend, PC71BM can effectively regulate the phase distribution of PBDB-T and ITIC in vertical direction, which provides favorable vertical phase distribution for charge transport. Moreover, the addition of PC71BM can also effectively increase the pi-pi stacking coherence length of both donor and acceptor, which facilitates charge transport and reduces the bimolecular recombination. The addition of an appropriate quantity of PC71BM can obviously improve both fill factor and short-circuit current density of the OSC based on PBDB-T:ITIC while open-circuit voltage reduces only about 0.01 V, which indicates a rational low energy loss. Consequently, the ternary OSC exhibits a best PCE of 11.0% compared to the 9.6% PCE of the binary counterpart.

Keyword :

Vertical phase distribution Charge transport Ternary organic solar cells Non-fullerene acceptor

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GB/T 7714 Bi, Pengqing , Xiao, Tong , Yang, Xiaoyu et al. Regulating the vertical phase distribution by fullerene-derivative in high performance ternary organic solar cells [J]. | NANO ENERGY , 2018 , 46 : 81-90 .
MLA Bi, Pengqing et al. "Regulating the vertical phase distribution by fullerene-derivative in high performance ternary organic solar cells" . | NANO ENERGY 46 (2018) : 81-90 .
APA Bi, Pengqing , Xiao, Tong , Yang, Xiaoyu , Niu, Mengsi , Wen, Zhenchuan , Zhang, Kangning et al. Regulating the vertical phase distribution by fullerene-derivative in high performance ternary organic solar cells . | NANO ENERGY , 2018 , 46 , 81-90 .
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Manipulating Doping of Organic Semiconductors by Reactive Oxygen for Field-Effect Transistors EI SCIE Scopus
期刊论文 | 2018 , 12 (10) | PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
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Thin film organic field-effect transistors (OFETs) are usually featured with charge traps, limiting charge transport and leading to low mobility especially at low gate voltages. In this work, doping process of a model organic semiconductor 2,7-didodecyl[1]benzothieno[3,2-b][1]benzothiophene (C12-BTBT) has been manipulated, using low-cost reactive oxygen namely oxygen plasma or ozone. It is found that low-pressure (20Pa) oxygen plasma can induce a low-moderate doping concentration, which is, however, sufficient to warrant field-effect mobilities over 5cm(2)V(-1)s(-1) in a large gate voltage range and sharp subthreshold swings, without degradation of on/off ratio. Low-pressure oxygen plasma can also positively shift the threshold voltage of the device, thus largely reducing the working voltages. Oxygen plasma with higher pressure than 100Pa induces higher doping concentration, more significantly shifting the threshold voltage and deteriorating on/off ratio due to substantial bulk electrical conductivity, which is similar to the treatment by UV-ozone at atmospheric pressure. As compared with the well-studied organic dopant F4-TCNQ, the doping process of reactive oxygen can be more easily in situ manipulated to reach an appropriate range of doping concentration, warranting higher performance and larger tunability for OFETs.

Keyword :

organic semiconductors doping charge transport oxygen plasma organic field-effect transistors

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GB/T 7714 Qiu, Yuming , Wei, Peng , Wang, Zihao et al. Manipulating Doping of Organic Semiconductors by Reactive Oxygen for Field-Effect Transistors [J]. | PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS , 2018 , 12 (10) .
MLA Qiu, Yuming et al. "Manipulating Doping of Organic Semiconductors by Reactive Oxygen for Field-Effect Transistors" . | PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS 12 . 10 (2018) .
APA Qiu, Yuming , Wei, Peng , Wang, Zihao , Lu, Wanlong , Jiang, Yihang , Zhang, Chaofan et al. Manipulating Doping of Organic Semiconductors by Reactive Oxygen for Field-Effect Transistors . | PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS , 2018 , 12 (10) .
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Giant Transconductance of Organic Field-Effect Transistors in Compensation Electric Fields Scopus
期刊论文 | 2018 , 10 (5) | Physical Review Applied
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© 2018 American Physical Society. In field-effect transistors (FETs) that typically have three electrodes, the charge density and electrical conductance of semiconductor films are tuned by an electric field provided by the gate electrode. However, the other two electrodes (source and drain) are inevitably applied with different voltages to generate a source-drain current to make the FET work, which causes a continuous evolution of charge accumulation (or depletion) in the three-dimensional semiconducting films during gate-voltage scanning and thus leads to an intrinsic delay between on and off states. To avoid the delay and accelerate the switching speed, here we propose that transconductance of semiconducting films can be significantly increased (denoted as "giant transconductance" here) when the transport channel is within extra static compensation electric fields and experimentally verify it in organic FETs. The giant transconductance is theoretically derived as super transconductance, corresponding to an abrupt current variation at a fixed gate voltage and thus ideally zero subthreshold swing as well as infinite effective field-effect mobility (μFET). Giant transconductance is compatible with high temperature (up to 400 K), but both the doping concentration and the film thickness should be synergically optimized to warrant the super-rapid switching. For practical applications, we choose poly(3-hexylthiophene) and 2,7-didodecyl[1]benzothieno[3,2-b][1]benzothiophene to experimentally demonstrate the giant transconductance and its capability of current modulation. Giant transconductance could be potentially used in oscillator circuits, sensors, and high-performance circuits.

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GB/T 7714 Hu, Yupeng , Wei, Peng , Wang, Xudong et al. Giant Transconductance of Organic Field-Effect Transistors in Compensation Electric Fields [J]. | Physical Review Applied , 2018 , 10 (5) .
MLA Hu, Yupeng et al. "Giant Transconductance of Organic Field-Effect Transistors in Compensation Electric Fields" . | Physical Review Applied 10 . 5 (2018) .
APA Hu, Yupeng , Wei, Peng , Wang, Xudong , Bu, Laju , Lu, Guanghao . Giant Transconductance of Organic Field-Effect Transistors in Compensation Electric Fields . | Physical Review Applied , 2018 , 10 (5) .
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Enhancing the Photovoltaic Performance via Vertical Phase Distribution Optimization in Small Molecule: PC71BM Blends EI SCIE Scopus
期刊论文 | 2017 , 7 (22) | ADVANCED ENERGY MATERIALS | IF: 21.875
WoS CC Cited Count: 8
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Bulk heterojunction (BHJ) morphologies are vital to the device performance of organic solar cells (OSCs), including phase separation in lateral and vertical directions. However, the morphology developed from the blend solution is not easily predicted and controlled, especially in the vertical direction, because the BHJ morphology is kinetically frozen during the rapid solvent evaporation process. Here, a simple approach to control BHJ morphologies with optimized phase distribution for small molecule:[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) blends by enhancing the substrate temperature during the spin-coating process. Three molecules with various fluorine atoms in the end acceptor units are selected. The relationship among molecular structures, substrate temperature effects on the morphology, and device performances are symmetrically investigated. Low temperature induces a multiple-sublayer-like architecture with significantly varied distributions of composition, morphology, and localized state energy, while high processing temperature induces more uniform film. The short-circuit current, opencircuit voltage, and fill factor of the devices are tuned with synergic improvement of efficiency toward over 10% and 11% for conventional and inverted devices. This work reveals the origination of vertical phase segregation, and provides a facile strategy to optimize the hierarchical phase separation for enhancing the performance of OSCs.

Keyword :

vertical phase distribution small molecules temperature effect organic photovoltaic devices

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GB/T 7714 Zhang, Yajie , Deng, Dan , Wang, Zaiyu et al. Enhancing the Photovoltaic Performance via Vertical Phase Distribution Optimization in Small Molecule: PC71BM Blends [J]. | ADVANCED ENERGY MATERIALS , 2017 , 7 (22) .
MLA Zhang, Yajie et al. "Enhancing the Photovoltaic Performance via Vertical Phase Distribution Optimization in Small Molecule: PC71BM Blends" . | ADVANCED ENERGY MATERIALS 7 . 22 (2017) .
APA Zhang, Yajie , Deng, Dan , Wang, Zaiyu , Wang, Yuheng , Zhang, Jianqi , Fang, Jin et al. Enhancing the Photovoltaic Performance via Vertical Phase Distribution Optimization in Small Molecule: PC71BM Blends . | ADVANCED ENERGY MATERIALS , 2017 , 7 (22) .
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Gate-voltage-dependent charge transport in multi-dispersed polymer thin films EI SCIE Scopus
期刊论文 | 2017 , 110 (9) | APPLIED PHYSICS LETTERS | IF: 3.495
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In semiconductor polymers, charge transport usually occurs via hopping between localized states, which are generally multi-dispersed due to multi-dispersed chemical structures, crystallinities, and phase segregations. We report a combined modeling and experimental study to investigate gate-voltage-dependent charge transport in field-effect transistors based on multi-dispersed polymers including semiconductor: semiconductor and semiconductor: insulator blends. Film-depth-dependent charge accumulation and transport are correlated with vertical composition profiles and film-depth-dependent energetic distribution of localized states. Even low gate-voltage could accumulate charges in any depth of the films, greatly increasing charge density in some (sub-) components for effective charge transport. Therefore, neither overall high crystallinity nor molecular ordering near the semiconductor-dielectric interface is necessarily required for high field-effect mobility (mu(FET)). This study not only proposes a model for high effective lFET recently reported in some nearly amorphous polymer films and the "bislope feature" in their transfer characteristics but also helps improve transistor performances and exploit transistor operations via manipulating charge distribution in multi-dispersed films. Published by AIP Publishing.

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GB/T 7714 Zhou, Ling , Bu, Laju , Li, Dongfan et al. Gate-voltage-dependent charge transport in multi-dispersed polymer thin films [J]. | APPLIED PHYSICS LETTERS , 2017 , 110 (9) .
MLA Zhou, Ling et al. "Gate-voltage-dependent charge transport in multi-dispersed polymer thin films" . | APPLIED PHYSICS LETTERS 110 . 9 (2017) .
APA Zhou, Ling , Bu, Laju , Li, Dongfan , Lu, Guanghao . Gate-voltage-dependent charge transport in multi-dispersed polymer thin films . | APPLIED PHYSICS LETTERS , 2017 , 110 (9) .
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Probing film-depth-related light harvesting in polymer solar cells via plasma etching EI SCIE Scopus
期刊论文 | 2017 , 7 (4) | AIP ADVANCES | IF: 1.653
WoS CC Cited Count: 2
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Light harvesting is the first step of photovoltaic process in polymer solar cells. However, such donor: acceptor bulk junction layers are usually featured with vertical phase segregation as well as film-depth-dependent molecular aggregation, chain orientation and crystallinity, leading to a significant variation of photon absorption and exciton generation at different film-depths. We propose an experimentally and numerically accessible method to investigate the depth-dependent light harvesting behaviors in the active layer in polymer solar cells. A low-pressure oxygen plasma is utilized to etch the active layer gradually which is monitored by a light absorption spectrometer. Including the obtained sublayer absorption spectra into transfer matrix optical model yields depth-dependent optical properties and exciton generation profiles, which contribute to quantum efficiency and short-circuit current. This approach is helpful to optimize vertical material variation and provide insights into photovoltaic process. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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GB/T 7714 Gao, Shuang , Bu, Laju , Zheng, Zhong et al. Probing film-depth-related light harvesting in polymer solar cells via plasma etching [J]. | AIP ADVANCES , 2017 , 7 (4) .
MLA Gao, Shuang et al. "Probing film-depth-related light harvesting in polymer solar cells via plasma etching" . | AIP ADVANCES 7 . 4 (2017) .
APA Gao, Shuang , Bu, Laju , Zheng, Zhong , Wang, Xudong , Wang, Weichen , Zhou, Ling et al. Probing film-depth-related light harvesting in polymer solar cells via plasma etching . | AIP ADVANCES , 2017 , 7 (4) .
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Influence of fluorination on the properties and performance of isoindigo-quaterthiophene-based polymers EI SCIE Scopus
期刊论文 | 2016 , 4 (14) , 5039-5043 | JOURNAL OF MATERIALS CHEMISTRY A | IF: 8.867
WoS CC Cited Count: 16
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Here a series of isoindigo (ID) and quaterthiophene (T4)-based donoracceptor copolymers are synthesized and compared. The polymer with fluorination on the donor unit exhibits the strongest extent of temperature-dependent aggregation, which leads to a higher hole mobility of the polymer and PSCs with efficiencies up to 7.0% without using any processing additives. Our results provide important insights into how fluorination affects the aggregation properties and performance of isoindigo-based polymers.

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GB/T 7714 Hu, Huawei , Jiang, Kui , Kim, Joo-Hyun et al. Influence of fluorination on the properties and performance of isoindigo-quaterthiophene-based polymers [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2016 , 4 (14) : 5039-5043 .
MLA Hu, Huawei et al. "Influence of fluorination on the properties and performance of isoindigo-quaterthiophene-based polymers" . | JOURNAL OF MATERIALS CHEMISTRY A 4 . 14 (2016) : 5039-5043 .
APA Hu, Huawei , Jiang, Kui , Kim, Joo-Hyun , Yang, Guofang , Li, Zhengke , Ma, Tingxuan et al. Influence of fluorination on the properties and performance of isoindigo-quaterthiophene-based polymers . | JOURNAL OF MATERIALS CHEMISTRY A , 2016 , 4 (14) , 5039-5043 .
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