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Recent advances and prospects of asymmetric non-fullerene small molecule acceptors for polymer solar cells 被引量:2
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作者 Liu Ye Weiyu Ye Shiming Zhang 《Journal of Semiconductors》 EI CAS CSCD 2021年第10期128-147,共20页
Recently,polymer solar cells developed very fast due to the application of non-fullerence acceptors.Substituting asymmetric small molecules for symmetric small molecule acceptors in the photoactive layer is a strategy... Recently,polymer solar cells developed very fast due to the application of non-fullerence acceptors.Substituting asymmetric small molecules for symmetric small molecule acceptors in the photoactive layer is a strategy to improve the performance of polymer solar cells.The asymmetric design of the molecule is very beneficial for exciton dissociation and charge transport and will also fine-tune the molecular energy level to adjust the open-circuit voltage(Voc)further.The influence on the absorption range and absorption intensity will cause the short-circuit current density(Jsc)to change,resulting in higher device performance.The effect on molecular aggregation and molecular stacking of asymmetric structures can directly change the microscopic morphology,phase separation size,and the active layer's crystallinity.Very recently,thanks to the ingenious design of active layer materials and the optimization of devices,asymmetric non-fullerene polymer solar cells(A-NF-PSCs)have achieved remarkable development.In this review,we have summarized the latest developments in asymmetric small molecule acceptors(A-NF-SMAs)with the acceptor-donor-acceptor(A-D-A)and/or acceptor-donor-acceptor-donor-acceptor(A-D-A-D-A)structures,and the advantages of asymmetric small molecules are explored from the aspects of charge transport,molecular energy level and active layer accumulation morphology. 展开更多
关键词 polymer solar cells non-fullerene acceptors small asymmetric molecules
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Benzothiadiazole-based materials for organic solar cells
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作者 Qiang Bei Bei Zhang +3 位作者 Kaifeng Wang Shiming Zhang Guichuan Xing Clément Cabanetos 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第1期3-15,共13页
The past few years have witnessed power conversion efficiency(PCE)of organic solar cells(OSCs)skyrocketing to the value of 20%due to the outstanding advantages of organic photoactive materials.The latter,which consist... The past few years have witnessed power conversion efficiency(PCE)of organic solar cells(OSCs)skyrocketing to the value of 20%due to the outstanding advantages of organic photoactive materials.The latter,which consist of donor and acceptor materials,indeed play important roles in OSCs,and particularly one building block has attracted considerable research attention,namely benzothiadiazole(BT).The diversity of OSCs based on the BT structure have indeed sprung up,and the progressive increase in PCE values is more than just eye-catching since it heralds a renewal and bright future of OSCs.This review analyzes significant studies that have led to these remarkable progresses and focuses on the most effective BT small-molecules and BT polymers for OSC reported in the last decades.The pivotal structure-property relationships,donor-acceptor matching criteria,and morphology control approaches are gathered and discussed in this paper.Lastly,we summarize the remaining challenges and offer a personal perspective on the future advance and improvement of OSCs. 展开更多
关键词 Organic solar cells BENZOTHIADIAZOLE DONOR ACCEPTOR POLYMER Non-fullerene acceptors
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The Key Role of Subtle Substitution for a High-Performance Ester-Modified Oligothiophene-Based Polymer Used in Photovoltaic Cells 被引量:1
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作者 Sunsun Li Yuan Ding +8 位作者 Lei Xu Wenchao Zhao Jianqi Zhang Jinzhao Qin Yuyang Zhang Jingjing Zhao Chang He Qiming Peng Jianhui Hou 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2022年第24期2867-2874,共8页
In organic solar cells (OSCs), developing high-performing easily synthesized photoactive materials is essential for pursuing cost- effective balance. Herein, we have designed and synthesized a pair of wide-band-gap po... In organic solar cells (OSCs), developing high-performing easily synthesized photoactive materials is essential for pursuing cost- effective balance. Herein, we have designed and synthesized a pair of wide-band-gap polymers (PBDE4T-0F and PBDE4T-2F), using the low synthesis cost dicarboxylic ester-substituted quaterthiophene as the building block. Despite the minor change of molecular structure for polymer PBDE4T-xF, the fluorine substituent in polymer PBDE4T-2F greatly enhances its interchain aggregation. The higher aggregation tendency of ester-modified polymer in solution is beneficial for reducing both the aggregate size and π-π stacking distance of blend film, which contribute to the highly efficient exciton dissociation and symmetric charge transport. An impressive power-conversion efficiency (PCE) of 16.1% is achieved for the PBDE4T-2F:BTP-eC9-based device, while its counterpart only delivers a PCE of 5.8% with distinctly lower short-circuit current density (J_(sc)) and fill factor. Notably, the aggregation effect of donor polymer has also been found to be associated with the energy level shifts, and thus the variation of charge transfer energy and voltage losses for blend system. The results suggest that simultaneously reduced voltage loss and increased J_(sc) can be expected by further finely tuning the aggregation behavior of the ester-modified oligothiophene-based donor polymer. 展开更多
关键词 Organic solar cells Polymers Ester-modified oligothiophene FLUORINE Aggregation
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Insight into the improvement mechanism of Co-Pi-modified hematite nanowire photoanodes for solar water oxidation
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作者 Xu Zhou Chunyan Wang +2 位作者 Fulin Liu Chengyu He Shiming Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2021年第10期3261-3263,共3页
The composite photoanodes composed by cobalt phosphate catalyst(Co-Pi) modified semiconductor have been widely used for solar water splitting,but the improvement mechanism has not been experimentally confirmed.Here we... The composite photoanodes composed by cobalt phosphate catalyst(Co-Pi) modified semiconductor have been widely used for solar water splitting,but the improvement mechanism has not been experimentally confirmed.Here we use transient photoelectrochemical measurements and impedance spectroscopy to investigate the effect of Co-Pi catalyst on hematite nanowire photoanode.It is found that under illumination the Co-Pi catalyst can efficiently promote the transfer of photo-generated holes to the Co-Pi layer by increasing the electrical conductivity of the composite structure under a low potential.The Co-Pi catalyst can recombine with photo-generated electrons to reduce the surface recombination efficiency of photo-generated holes and electrons under a high potential.These results provide important new understanding of the performance improvement mechanism for the Co-Pi-modified semiconductor nanowire composite photoanodes. 展开更多
关键词 Semiconductor nanowires Oxygen-evolving catalyst Composite structure Water oxidation mechanism
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Stability,encapsulation and large-area fabrication of organic photovoltaics
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作者 Shan Song Jiaorong Lu +4 位作者 Weiyu Ye Bei Zhang Xuan Liu Guichuan Xing Shiming Zhang 《Science China Chemistry》 SCIE EI CSCD 2021年第9期1441-1459,共19页
Organic photovoltaics(OPVs)have become a timely research topic for their advantages of light weight,low cost,low toxicity,environmental adaptability,flexibility,and large-area manufacture,especially after non-fulleren... Organic photovoltaics(OPVs)have become a timely research topic for their advantages of light weight,low cost,low toxicity,environmental adaptability,flexibility,and large-area manufacture,especially after non-fullerene acceptor ITIC reported in 2015.The highest power conversion efficiency(PCE)is currently above 18%for OPV.However,there are still imparities in the efficiency of OPVs when compared with silicon-based photovoltaics,as well as in their shelf life.Compared with inorganicbased photovoltaics,the efficiency of large-area OPVs is lower and the life time of OPVs is shorter.Therefore,such inferior performance of large-area OPVs restricts the commercial development.Based on these constraints,this paper reviews the research work regarding OPVs into three aspects:stability,encapsulation technology,and recent large-area preparation technologies. 展开更多
关键词 organic photovoltaics STABILITY ENCAPSULATION large-area fabrication
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