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学者姓名：鲁广昊
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Abstract ：
As a benchmark semiconducting polymer, poly(3-hexyl-thiophene) (P3HT) has been broadly used to construct a wide range of organic electronic devices such as photovoltaic cells, photodetectors, thermoelectrics, and transistors. In the last two decades, numerous studies have concentrated on modulating the morphology and performance of organic solar cells based on P3HT and fullerene derivatives. In comparison with P3HT:fullerene systems, the blends of P3HT with emerging nonfullerene acceptors remain significantly less explored and the structure-performance relationships are not well established. In this work, time-dependent grazing incidence X-ray scattering and real-space microscopy experiments were carried out to monitor the microstructure change of the high-efficiency blend of P3HT and a Y6-type nonfullerene acceptor (i.e., ZY-4Cl) over the duration of thermal annealing. By precisely manipulating the crystalline order of both the donor and acceptor, we found that simply shortening the annealing time can cause a remarkable 19-fold increase in the solar cell efficiency. We observed profound changes in all the photovoltaic parameters (open-circuit voltage, current density, fill factor, and power conversion efficiency) within the first 1 minute, while a slight variation emerged in the later stage. Attractively, the P3HT:ZY-4Cl blend film subject to thermal annealing for merely 30 seconds gave rise to a remarkable power conversion efficiency of similar to 10.7%, which is the best efficiency of P3HT-based organic photovoltaic cells at present. The research shed light on the morphological optimization and cost-effective processing of polythiophene:nonfullerene blends for optoelectronic applications.
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| GB/T 7714 | Xian, Kaihu , Liu, Yang , Liu, Junwei et al. Delicate crystallinity control enables high-efficiency P3HT organic photovoltaic cells [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (7) : 3418-3429 . |
| MLA | Xian, Kaihu et al. "Delicate crystallinity control enables high-efficiency P3HT organic photovoltaic cells" . | JOURNAL OF MATERIALS CHEMISTRY A 10 . 7 (2022) : 3418-3429 . |
| APA | Xian, Kaihu , Liu, Yang , Liu, Junwei , Yu, Jinde , Xing, Yifan , Peng, Zhongxiang et al. Delicate crystallinity control enables high-efficiency P3HT organic photovoltaic cells . | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (7) , 3418-3429 . |
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Abstract ：
The invention of Y-series non-fullerene acceptors (NFAs) has made a breakthrough in high-performance organic solar cells (OSCs). However, the morphology optimization of the active layer is still challenging in NFA-based OSCs due to the similar building units of the donor and acceptor. Herein, we propose an NFA molecular structure by introducing trifluoro alkyl side chains to the pyrrole unit of the fused ring dithienothiophen[3,2-b]-pyrrolobenzothiadiazole (BTP) core for the first time. Three acceptors with different trifluoro alkyl chains are designed and synthesized, named BTP-BF, BTP-OF, and BTP-DF for the molecules with trifluorobutyl, trifluorooctyl, and trifluorodecyl side chains, respectively. The trifluorodecyl side chains of the BTP-DF molecule can regulate the intrinsic properties of the molecule, which has a significant beneficial effect on the surface energy and the intermolecular interaction. A vertical phase distribution is obtained by pairing BTP-DF with a wide bandgap polymer donor (PTQ10), and the device efficiency can reach as high as 15.14%. These results reveal that introducing trifluoro substitution groups to alkyl side chains is an effective strategy to achieve reduced surface energy and optimal vertical phase distribution, thus facilitating the charge separation and collection to obtain high-performance OSCs.
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| GB/T 7714 | Zhang, Tian , Chen, Haopeng , Li, Chuanfu et al. Trifluoro alkyl side chains in the non-fullerene acceptors to optimize the phase miscibility and vertical distribution of organic solar cells [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (16) : 8837-8845 . |
| MLA | Zhang, Tian et al. "Trifluoro alkyl side chains in the non-fullerene acceptors to optimize the phase miscibility and vertical distribution of organic solar cells" . | JOURNAL OF MATERIALS CHEMISTRY A 10 . 16 (2022) : 8837-8845 . |
| APA | Zhang, Tian , Chen, Haopeng , Li, Chuanfu , Lu, Kun , Zhang, Liting , Shokrieh, Ahmad et al. Trifluoro alkyl side chains in the non-fullerene acceptors to optimize the phase miscibility and vertical distribution of organic solar cells . | JOURNAL OF MATERIALS CHEMISTRY A , 2022 , 10 (16) , 8837-8845 . |
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Abstract ：
Insulator materials can trap charges, referring to electrets, which are attractive for transistors and memories. However, insulators intrinsically exhibit high electrical resistance, thus the charge injection and release inside insulators typically need high voltage or long bias time, limiting the applications that require high writing/erasing speed. In this work, insulator polymer polystyrene (PS) film is treated by a soft plasma, which selectively induces a high density of charge traps at the top surface, without changing the electronic properties of the underneath materials. The thus-prepared surface is easily occupied by external neat charges to form a meso-stable electret. Subsequently, the electret is used as an ultra-thin charge trapping layer to build transistors for some applications. Consequently, in transistor architecture, the charge injection and release at soft plasma treated PS surface can be more easily achieved in a short stimulus as compared with pristine PS counterpart, and the density of captured holes under gate bias reaches 2.9 x 10(12) cm(-2) in 1 ms. Under UV irradiation, charge transfer occurs from the photo-excited semiconductor to the electret, contributing to the rapid release of the stored holes. This soft plasma-generated electret is then utilized for flash-type memories, photodetectors, and artificial synapses.
Keyword ：
artificial synapses memories organic field-effect transistors photodetectors plasma treatment polymer electrets
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| GB/T 7714 | Qiao, Nan , Wei, Peng , Xing, Yifan et al. Rapid Charge Storage and Release at Etching-Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses [J]. | ADVANCED MATERIALS INTERFACES , 2022 , 9 (19) . |
| MLA | Qiao, Nan et al. "Rapid Charge Storage and Release at Etching-Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses" . | ADVANCED MATERIALS INTERFACES 9 . 19 (2022) . |
| APA | Qiao, Nan , Wei, Peng , Xing, Yifan , Qin, Xinsu , Wang, Xin , Li, Xiang et al. Rapid Charge Storage and Release at Etching-Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses . | ADVANCED MATERIALS INTERFACES , 2022 , 9 (19) . |
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Abstract ：
In this work, we apply the sequential processing (SqP) method to address the relatively low electron mobility in recent all-polymer solar cells (all-PSCs) based on the polymerized small-molecule acceptor (PSMA). Compared to the blend-casting (BC) method, all-PSCs composed of PM6/PY-IT via the SqP method show boosted electron mobility and a more balanced charge carrier transport, which increases the FF of the SqP device and compensates for the short-circuit current loss, rendering comparable overall performance with the BC device. Through film-depth-dependent light absorption spectroscopy, we analyze the sub-layer absorption and exciton generation rate in the vertical direction of the device, and discuss the effect of the increased electron mobility on device performance, accordingly.
Keyword ：
all-polymer solar cells polymerized small-molecule acceptors sequential processing
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| GB/T 7714 | Zhao, Chaoyue , Huang, Hui , Wang, Lihong et al. Efficient All-Polymer Solar Cells with Sequentially Processed Active Layers [J]. | POLYMERS , 2022 , 14 (10) . |
| MLA | Zhao, Chaoyue et al. "Efficient All-Polymer Solar Cells with Sequentially Processed Active Layers" . | POLYMERS 14 . 10 (2022) . |
| APA | Zhao, Chaoyue , Huang, Hui , Wang, Lihong , Zhang, Guoping , Lu, Guanyu , Yu, Han et al. Efficient All-Polymer Solar Cells with Sequentially Processed Active Layers . | POLYMERS , 2022 , 14 (10) . |
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Abstract ：
Exciton diffusion length and graded vertical phase separation of the active layer play a critical role in the realization of high-performance thick-film organic solar cells (OSCs). Here, authors demonstrated OSCs with an efficiency of 17.31%, with an active layer thickness of around 300 nm. The development of organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, an efficiency of 17.31% (certified value of 16.9%) is obtained for the 300 nm-thick OSC, with a short-circuit current density of 28.36 mA cm(-2), and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows an efficiency of 15.21%. This work provides valuable insights into the fabrication of OSCs with thick active layers.
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| GB/T 7714 | Cai, Yunhao , Li, Qian , Lu, Guanyu et al. Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with thick active layers [J]. | NATURE COMMUNICATIONS , 2022 , 13 (1) . |
| MLA | Cai, Yunhao et al. "Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with thick active layers" . | NATURE COMMUNICATIONS 13 . 1 (2022) . |
| APA | Cai, Yunhao , Li, Qian , Lu, Guanyu , Ryu, Hwa Sook , Li, Yun , Jin, Hui et al. Vertically optimized phase separation with improved exciton diffusion enables efficient organic solar cells with thick active layers . | NATURE COMMUNICATIONS , 2022 , 13 (1) . |
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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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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 insulation polymer space charge
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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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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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Abstract ：
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 ：
amphiphilic block copolymers crystallization modifiers hydrosol N,N '-dioctyl perylene diimide sonocrystallization
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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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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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