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Top and bottom electrode optimization enabled high-performance flexible and semi-transparent organic solar cells EI SCIE
期刊论文 | 2021 , 5 (11) , 4310-4316 | MATERIALS CHEMISTRY FRONTIERS
WoS CC Cited Count: 2
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Abstract :

The fabrication of highly efficient flexible and semitransparent large-area organic solar cells (OSCs) is an utmost requirement for the effective commercialization and industrialization of this technology. However, obtaining such large-area flexible devices with high transparency and high performance is a tremendous task. Herein, a series of high performing devices, with more than 8% power conversion efficiency (PCE) for large-area (1.25 cm(2)) flexible semitransparent OSCs have been successfully developed. The semitransparency has been maintained at around 16-24% average visible light transmittance (AVT), whereas even after 1000 bending cycles at a bending radius of 10 mm, the corresponding devices still maintained about 95% of their initial efficiency. This outstanding performance has been attributed to the rather unique top and bottom silver grid architecture. The bottom transparent flexible silver grid substrate (bottom electrode) produces the cavity effect with the top silver electrode, resulting in enhanced device performance with high transparency. Furthermore, the top metal electrode, which is composed of laser processed semitransparent charge-transporting busbars over the thin metal surface, guarantees efficient transmittance while enhancing the charge collection ability. Hence, such top busbar structures might be a general solution for overcoming the trade-off between the AVT and the PCE. Overall, this study provides a promising strategy for the transfer of large-area flexible semitransparent OSCs into practical industrial applications.

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GB/T 7714 Wang, Yuheng , Wang, Guodong , Xing, Yi et al. Top and bottom electrode optimization enabled high-performance flexible and semi-transparent organic solar cells [J]. | MATERIALS CHEMISTRY FRONTIERS , 2021 , 5 (11) : 4310-4316 .
MLA Wang, Yuheng et al. "Top and bottom electrode optimization enabled high-performance flexible and semi-transparent organic solar cells" . | MATERIALS CHEMISTRY FRONTIERS 5 . 11 (2021) : 4310-4316 .
APA Wang, Yuheng , Wang, Guodong , Xing, Yi , Adil, Muhammad Abdullah , Memon, Waqar Ali , Chang, Yilin et al. Top and bottom electrode optimization enabled high-performance flexible and semi-transparent organic solar cells . | MATERIALS CHEMISTRY FRONTIERS , 2021 , 5 (11) , 4310-4316 .
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High-performance all-small-molecule organic solar cells without interlayers EI SCIE
期刊论文 | 2021 , 14 (5) , 3174-3183 | ENERGY & ENVIRONMENTAL SCIENCE
WoS CC Cited Count: 2
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Abstract :

In this work, we report a two-step solvent treatment (TSST) strategy to construct high-performance all-small-molecule solar cells (all-SMSCs) without interfacial layers (IFLs), which only consist of an active layer (AL) sandwiched between two electrodes. The chlorinated ITO (ITO-Cl) anode exhibits down-shifted work functions and improved surface energy enabled by the presence of a large density of chloride ions caused by the surface chlorination of ITO. Moreover, the Al cathode shows elevated vacuum level and reduced interfacial trap density enabled by surface treatment of the active layer with polar methanol. The ITO-Cl/AL/Al-based devices form Ohmic contacts and boost the efficiency of the B1:BTP-eC9 system to 14.86%, which is higher than that of the control device (13.92%) with two IFLs. The use of this TSST strategy in the other two all-small-molecule systems is also confirmed, demonstrating its good generality. This strategy can significantly improve device stabilities, extend the life cycles of ITO substrates, and reduce modules' production costs.

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GB/T 7714 Sun, Rui , Wu, Yao , Guo, Jie et al. High-performance all-small-molecule organic solar cells without interlayers [J]. | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (5) : 3174-3183 .
MLA Sun, Rui et al. "High-performance all-small-molecule organic solar cells without interlayers" . | ENERGY & ENVIRONMENTAL SCIENCE 14 . 5 (2021) : 3174-3183 .
APA Sun, Rui , Wu, Yao , Guo, Jie , Wang, Yuheng , Qin, Fei , Shen, Bingxiu et al. High-performance all-small-molecule organic solar cells without interlayers . | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (5) , 3174-3183 .
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Surface Etching of Polymeric Semiconductor Films Improves Environmental Stability of Transistors EI SCIE
期刊论文 | 2021 , 33 (7) , 2673-2682 | CHEMISTRY OF MATERIALS
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Abstract :

Solution-processed polymeric semiconductor films are attracting wide interest for applications in flexible electronics, wherein environmental stability is still a big obstacle. In many polymeric thin-film electronic devices, vertical phase separation has been observed, which leads to film depth dependences of electronic properties. Here, a soft plasma-assisted surface etching method to improve the environmental stability and maintain the electronic properties of organic field-effect transistors (OFETs) is proposed, by which the unwanted thin-film surface (exposed to air) is selectively taken away upon soft plasma etching, and the layer beneath the surface (subsurface) is preserved without any damage to the subsurface's structure or electronic function. Investigation of frequently used polymeric semiconductors poly(3-hexylthiophene) and poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4b']dithiophen-2-yl)-alt [1,2,5]thiadiazolo[3,4-c]pyridine] shows that the crystallinity of the surface layer is higher than that of the subsurface layer. However, for p-type polymeric semiconductors, higher crystallinity usually leads to a lower ionization energy and higher doping concentration during exposure to air and thus a higher background conductivity, deteriorating the switching-off capability of the organic field-effect transistors (OFETs). Therefore, by removing this surface layer, the lifetime of OFETs in air is effectively increased by over 50%.

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GB/T 7714 Zhai, Chenyang , Yang, Xiaohui , Han, Songyu et al. Surface Etching of Polymeric Semiconductor Films Improves Environmental Stability of Transistors [J]. | CHEMISTRY OF MATERIALS , 2021 , 33 (7) : 2673-2682 .
MLA Zhai, Chenyang et al. "Surface Etching of Polymeric Semiconductor Films Improves Environmental Stability of Transistors" . | CHEMISTRY OF MATERIALS 33 . 7 (2021) : 2673-2682 .
APA Zhai, Chenyang , Yang, Xiaohui , Han, Songyu , Lu, Guanghao , Wei, Peng , Chumakov, Andrei et al. Surface Etching of Polymeric Semiconductor Films Improves Environmental Stability of Transistors . | CHEMISTRY OF MATERIALS , 2021 , 33 (7) , 2673-2682 .
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Self-Powered Organic Photodetectors with High Detectivity for Near Infrared Light Detection Enabled by Dark Current Reduction SCIE
期刊论文 | 2021 | ADVANCED FUNCTIONAL MATERIALS
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Abstract :

Organic photodetectors (OPDs) for near infrared (NIR) light detection represents cutting-edge technology for optical communication, environmental monitoring, biomedical imaging, and sensing. Herein, a series of self-powered OPDs with high detectivity are constructed by the sequential deposition (SD) method. The dark currents (J(d)) of SD devices are effectively reduced in comparison to blend casting (BC) ones due to the vertical phase segregation structure. Impressively, the J(d) values of SD devices based on D18 and Y6 system is reduced to be 2.1 x 10(-11) A cm(-2) at 0 V, which is two orders of magnitude lower than those of the BC devices. The D* value of the SD device is superior to that of BC device under different bias voltages (0, -0.5, -1.0, and -2.0 V) due to the reduction of dark current, which originates from the fine vertical phase separation structure of the SD device. The mechanism studies shows that the vertical phase segregation structure can effectively suppress the unfavorable charge injection, thus reducing the dark current. Also, the surface energy is proven to play a key role in the photocurrent stability. In addition, the flexible OPDs demonstrate excellent performance in photoplethysmography test.

Keyword :

organic photodetectors self-powered photodetectors stability detectivity

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GB/T 7714 Wei, Yanan , Chen, Hao , Liu, Tianhua et al. Self-Powered Organic Photodetectors with High Detectivity for Near Infrared Light Detection Enabled by Dark Current Reduction [J]. | ADVANCED FUNCTIONAL MATERIALS , 2021 .
MLA Wei, Yanan et al. "Self-Powered Organic Photodetectors with High Detectivity for Near Infrared Light Detection Enabled by Dark Current Reduction" . | ADVANCED FUNCTIONAL MATERIALS (2021) .
APA Wei, Yanan , Chen, Hao , Liu, Tianhua , Wang, Song , Jiang, Yihang , Song, Yu et al. Self-Powered Organic Photodetectors with High Detectivity for Near Infrared Light Detection Enabled by Dark Current Reduction . | ADVANCED FUNCTIONAL MATERIALS , 2021 .
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Infrared spectroscopy depth profiling of organic thin films EI SCIE
期刊论文 | 2021 , 8 (5) , 1461-1471 | MATERIALS HORIZONS
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Organic thin films are widely used in organic electronics and coatings. Such films often feature film-depth dependent variations of composition and optoelectronic properties. State-of-the-art depth profiling methods such as mass spectroscopy and photoelectron spectroscopy rely on non-intrinsic species (vaporized ions, etching-induced surface defects), which are chemically and functionally different from the original materials. Here we introduce an easily-accessible and generally applicable depth profiling method: film-depth-dependent infrared (FDD-IR) spectroscopy profilometry based on directly measuring the intrinsic material after incremental surface-selective etching by a soft plasma, to study the material variations along the surface-normal direction. This depth profiling uses characteristic vibrational signatures of the involved compounds, and can be used for both conjugated and non-conjugated, neutral and ionic materials. A film-depth resolution of one nanometer is achieved. We demonstrate the application of this method for investigation of device-relevant thin films, including organic field-effect transistors and organic photovoltaic cells, as well as ionized dopant distributions in doped semiconductors.

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GB/T 7714 Yu, Jinde , Xing, Yifan , Shen, Zichao et al. Infrared spectroscopy depth profiling of organic thin films [J]. | MATERIALS HORIZONS , 2021 , 8 (5) : 1461-1471 .
MLA Yu, Jinde et al. "Infrared spectroscopy depth profiling of organic thin films" . | MATERIALS HORIZONS 8 . 5 (2021) : 1461-1471 .
APA Yu, Jinde , Xing, Yifan , Shen, Zichao , Zhu, Yuanwei , Neher, Dieter , Koch, Norbert et al. Infrared spectroscopy depth profiling of organic thin films . | MATERIALS HORIZONS , 2021 , 8 (5) , 1461-1471 .
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Balancing the efficiency, stability, and cost potential for organic solar cells via a new figure of merit EI SCIE
期刊论文 | 2021 , 5 (5) , 1209-1230 | JOULE
WoS CC Cited Count: 1
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Abstract :

In spite of the great success in device efficiency resulting from the excessive design of photovoltaic materials, the stability and cost issues concerning basic commercial requirements of organic solar cells (OSCs) remain unresolved or controversial, slowing down the introduction of market-ready applications. We proposed an exciting discovery that as the active layer thickness decreases, the thermal stability increases gradually, even exceeding 100% of the initial efficiency under 150 degrees C thermal stress. This trend was further confirmed by investigating thermodynamics and kinetics of morphology evolution for PM6:Y6 as a reference example, Extended research found that there is a similar correlation between photo-thermal stability and blend thickness. Consequently, a new reliable industrial figure of merit (i-FOM2.0), including four main factors: efficiency, photo-thermal stability, synthesis complexity, and active layer thickness, is presented here. Our work provides a promising trade-off strategy for reducing efficiency-stability-cost gap and accelerates the commercialization of OSCs.

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GB/T 7714 Yang, Wenyan , Wang, Wei , Wang, Yuheng et al. Balancing the efficiency, stability, and cost potential for organic solar cells via a new figure of merit [J]. | JOULE , 2021 , 5 (5) : 1209-1230 .
MLA Yang, Wenyan et al. "Balancing the efficiency, stability, and cost potential for organic solar cells via a new figure of merit" . | JOULE 5 . 5 (2021) : 1209-1230 .
APA Yang, Wenyan , Wang, Wei , Wang, Yuheng , Sun, Rui , Guo, Jie , Li, Hongneng et al. Balancing the efficiency, stability, and cost potential for organic solar cells via a new figure of merit . | JOULE , 2021 , 5 (5) , 1209-1230 .
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Layer-by-layer slot-die coated high-efficiency organic solar cells processed using twin boiling point solvents under ambient condition SCIE CSCD
期刊论文 | 2021 , 14 (11) , 4236-4242 | NANO RESEARCH
WoS CC Cited Count: 1
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Abstract :

Layer-by-layer (LbL) strategy has been developed to form bulk heterojunction (BHJ) structure for processing efficient organic solar cells (OSCs). Herein, LbL slot-die coating with twin boiling point solvents (TBPS) strategy was developed to fabricate highly efficient OSCs, which matches with large-scale, high throughput roll-to-roll (R2R) industrialized mass process. The TBPS strategy could produce high-quality thin film without any additive, leading to the optimized vertical phase separation with interpenetrating nanostructures, as well as the enhanced charge transport and extraction. Thus, the power conversion efficiency up to 14.42% was achieved for [(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo [1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)]:2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2 '',3 '':4 '',5 '']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene)) bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (PM6:Y6) OSCs fabricated via sequentially LbL slot-die coating using the TBPS strategy under ambient condition. The research provides a potential route for industrialized production of high-efficiency and large-area OSC devices.

Keyword :

layer-by-layer (LbL) twin boiling point solvent slot-die coating vertical phase separation organic solar cells

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GB/T 7714 Yang, Yu , Feng, Erming , Li, Hengyue et al. Layer-by-layer slot-die coated high-efficiency organic solar cells processed using twin boiling point solvents under ambient condition [J]. | NANO RESEARCH , 2021 , 14 (11) : 4236-4242 .
MLA Yang, Yu et al. "Layer-by-layer slot-die coated high-efficiency organic solar cells processed using twin boiling point solvents under ambient condition" . | NANO RESEARCH 14 . 11 (2021) : 4236-4242 .
APA Yang, Yu , Feng, Erming , Li, Hengyue , Shen, Zichao , Liu, Wanrong , Guo, Jingbo et al. Layer-by-layer slot-die coated high-efficiency organic solar cells processed using twin boiling point solvents under ambient condition . | NANO RESEARCH , 2021 , 14 (11) , 4236-4242 .
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Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications SCIE PubMed
期刊论文 | 2021 , 14 (19) | MATERIALS
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Abstract :

Power equipment operates under high voltages, inducing space charge accumulation on the surface of key insulating structures, which increases the risk of discharge/breakdown and the possibility of maintenance workers experiencing electric shock accidents. Hence, a visualized non-equipment space charge detection method is of great demand in the power industry. Typical electrochromic phenomenon is based on redox of the material, triggered by a voltage smaller than 5 V with a continuous current in mu A~mA level, which is not applicable to high electric fields above 10(6) V/m with pA~nA operation current in power equipment. Until now, no naked-eye observation technique has been realized for space charge detection to ensure the operation of power systems as well as the safety of maintenance workers. In this work, a viologen/poly(vinylidene fluoride-co-hexafluoropropylene)(P(VDF-HFP)) composite is investigated from gel to insulating bulk configurations to achieve high-voltage electrical-insulating electrochromism. The results show that viologen/P(VDF-HFP) composite bulk can withstand high electric fields at the 10(7) V/m level, and its electrochromism is triggered by space charges. This electrochromism phenomenon can be visually extended by increasing viologen content towards 5 wt.% and shows a positive response to voltage amplitude and application duration. As viologen/P(VDF-HFP) composite bulk exhibits a typical electrical insulating performance, it could be attached to the surface of insulating structures or clamped between metal and insulating materials as a space charge accumulation indicator in high-voltage power equipment.

Keyword :

electrochromism high voltage space charge insulation polymer

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GB/T 7714 Nie, Yongjie , Zhang, Meng , Zhu, Yuanwei et al. Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications [J]. | MATERIALS , 2021 , 14 (19) .
MLA Nie, Yongjie et al. "Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications" . | MATERIALS 14 . 19 (2021) .
APA Nie, Yongjie , Zhang, Meng , Zhu, Yuanwei , Jing, Yu , Shi, Wenli , Li, Guoping et al. Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications . | MATERIALS , 2021 , 14 (19) .
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Film-Depth-Dependent Light Reflection Spectroscopy for Photovoltaics and Transistors EI SCIE
期刊论文 | 2021 , 8 (22) | ADVANCED MATERIALS INTERFACES
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Organic thin films are widely investigated for solar cells, field-effect transistors, and other thin film devices. However, rare methods are available to characterize the film-depth dependent variations of materials. Here, a film-depth-dependent light reflection spectroscopy of polymer thin films is proposed to sequentially show the optical properties at each film-depth and consequently characterize the vertical phase segregation of polymer thin films, which is applicable for both transparent and opaque systems. Synchronic acquirement of light reflection and transmission spectra during soft plasma etching optimizes the film-depth profiling resolution toward 1 nm, which is applied to organic solar cells and organic field-effect transistors characterizations.

Keyword :

photovoltaics film-depth profiling organic field-effect transistors light reflection organic electronics

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GB/T 7714 Shen, Zichao , Jiang, Yihang , Yu, Jinde et al. Film-Depth-Dependent Light Reflection Spectroscopy for Photovoltaics and Transistors [J]. | ADVANCED MATERIALS INTERFACES , 2021 , 8 (22) .
MLA Shen, Zichao et al. "Film-Depth-Dependent Light Reflection Spectroscopy for Photovoltaics and Transistors" . | ADVANCED MATERIALS INTERFACES 8 . 22 (2021) .
APA Shen, Zichao , Jiang, Yihang , Yu, Jinde , Zhu, Yuanwei , Bu, Laju , Lu, Guanghao . Film-Depth-Dependent Light Reflection Spectroscopy for Photovoltaics and Transistors . | ADVANCED MATERIALS INTERFACES , 2021 , 8 (22) .
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Crystallization Control of N,N '-Dioctyl Perylene Diimide by Amphiphilic Block Copolymers Containing poly(3-Hexylthiophene) and Polyethylene Glycol SCIE PubMed
期刊论文 | 2021 , 9 | FRONTIERS IN CHEMISTRY
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The preparation of micron- to nanometer-sized functional materials with well-defined shapes and packing is a key process to their applications. There are many ways to control the crystal growth of organic semiconductors. Adding polymer additives has been proven a robust strategy to optimize semiconductor crystal structure and the corresponding optoelectronic properties. We have found that poly(3-hexylthiophene) (P3HT) can effectively regulate the crystallization behavior of N,N '-dioctyl perylene diimide (C8PDI). In this study, we combined P3HT and polyethylene glycol (PEG) to amphiphilic block copolymers and studied the crystallization modification effect of these block copolymers. It is found that the crystallization modification effect of the block copolymers is retained and gradually enhanced with P3HT content. The length of C8PDI crystals were well controlled from 2 to 0.4 mu m, and the width from 210 to 35 nm. On the other hand, due to the water solubility of PEG block, crystalline PEG-b-P3HT/C8PDI micelles in water were successfully prepared, and this water phase colloid could be stable for more than 2 weeks, which provides a new way to prepare pollution-free aqueous organic semiconductor inks for printing electronic devices.

Keyword :

crystallization modifiers N,N '-dioctyl perylene diimide amphiphilic block copolymers sonocrystallization hydrosol

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GB/T 7714 Yang, Xiaohui , Lu, Wanlong , Cao, Jingning et al. Crystallization Control of N,N '-Dioctyl Perylene Diimide by Amphiphilic Block Copolymers Containing poly(3-Hexylthiophene) and Polyethylene Glycol [J]. | FRONTIERS IN CHEMISTRY , 2021 , 9 .
MLA Yang, Xiaohui et al. "Crystallization Control of N,N '-Dioctyl Perylene Diimide by Amphiphilic Block Copolymers Containing poly(3-Hexylthiophene) and Polyethylene Glycol" . | FRONTIERS IN CHEMISTRY 9 (2021) .
APA Yang, Xiaohui , Lu, Wanlong , Cao, Jingning , Zhai, Chenyang , Li, Weili , Zha, Fangwen et al. Crystallization Control of N,N '-Dioctyl Perylene Diimide by Amphiphilic Block Copolymers Containing poly(3-Hexylthiophene) and Polyethylene Glycol . | FRONTIERS IN CHEMISTRY , 2021 , 9 .
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