Enhancing π-Delocalization and Suppressing Traps via Doping in Electron Transport Materials for Efficient Semitransparent Organic PhotovoltaicsOA
The ultrathin metal electrode in semitransparent organic photovoltaics(STOPVs)usually suffers from limited charge collection capability and conductivity and thus hinders the power conversion efficiency(PCE).Herein,a new strategy of enhancing theπ-delocalization of electron transport layer(ETL)via lithium bis(trifluoromethanesulfonyl)imide doping is developed.The enhancedπ-delocalization in ETL benefits sizeable intermolecularπ-πoverlap,prone to harvesting electrons and thereby improving charge collection range.Doping also improves the conductivity of both ETL and ultrathin silver electrode.Furthermore,the trap densities in ETL and STOPV devices are reduced after doping,contributing to suppressed recombination and higher PCE.Consequently,ETL doping maintains an average visible transmittance of~30%while promotes the PCE of STOPVs from 13.0% to 14.3% and light utilization efficiency from 3.74% to 4.15%,which is among the highest values of optical structurefree STOPVs.This work provides a new insight ofπ-delocalization manipulation in ETL for efficient STOPVs.
Yating Mo;Jiayu Wang;Hanjiao Chen;Yufei Gong;Jianglong Zhou;Junhao Lu;Cenqi Yan;Lei Meng;Liang-Wen Feng;Yongfang Li;Pei Cheng
College of Polymer Science and Engineering,State Key Laboratory of Advanced Polymer Materials,Sichuan University,610065 Chengdu,People''s Republic of ChinaCollege of Polymer Science and Engineering,State Key Laboratory of Advanced Polymer Materials,Sichuan University,610065 Chengdu,People''s Republic of ChinaAnalytic&Testing Center,Sichuan University,610065 Chengdu,People''s Republic of ChinaBeijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,100190 Beijing,People''s Republic of ChinaKey Laboratory of Green Chemistry&Technology,Ministry of Education,College of Chemistry,Sichuan University,610065 Chengdu,People''s Republic of ChinaCollege of Polymer Science and Engineering,State Key Laboratory of Advanced Polymer Materials,Sichuan University,610065 Chengdu,People''s Republic of ChinaCollege of Polymer Science and Engineering,State Key Laboratory of Advanced Polymer Materials,Sichuan University,610065 Chengdu,People''s Republic of ChinaBeijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,100190 Beijing,People''s Republic of ChinaKey Laboratory of Green Chemistry&Technology,Ministry of Education,College of Chemistry,Sichuan University,610065 Chengdu,People''s Republic of ChinaBeijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,100190 Beijing,People''s Republic of ChinaCollege of Polymer Science and Engineering,State Key Laboratory of Advanced Polymer Materials,Sichuan University,610065 Chengdu,People''s Republic of China
信息技术与安全科学
Semitransparent organic photovoltaicsInterfacial engineeringπ-delocalizationSurface trapsElectrical loss
《Nano-Micro Letters》 2026 (7)
P.710-722,13
supported by the National Natural Science Foundation of China(Grant No.:52573206,52403331,52403239 and 22376147)the Sichuan Science and Technology Program(Grant No.:2023YFH0085,2023YFH0086,2023YFH0087 and 2023YFSY0064)and State Key Laboratory of Advanced Polymer Materials(Grant No.:sklpme2023-2-11 and sklpme2024-2-15).
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