交联PEDOT∶F空穴传输...光伏电池性能的研究（英文）_韦晚霞.pdf

Chem.J.Chinese Universities,2023,44(7),2023006920230069(1/8)CHEMICAL JOURNAL OF CHINESE UNIVERSITIES高 等 学 校 化 学 学 报研究论文交联PEDOT F空穴传输层提升柔性有机光伏电池性能的研究韦晚霞#，周先敏#，董馨韵，刘铁峰，谢聪，程靖宇，陈建平，陆鑫，冯凯，周印华（华中科技大学武汉光电国家研究中心,武汉 430074）摘要 银纳米线(AgNWs)顶电极是全溶液加工型有机太阳能电池(OSCs)的重要组成部分.然而,在涂布AgNWs乙醇溶液时,对下层空穴传输层有一定洗脱损坏.本文提出对空穴传输层聚(3,4-乙烯二氧噻吩)全氟磺酸离子聚合物(PEDOT F)进行交联,以提升其抗溶剂渗透能力.通过引入交联剂聚乙二醇二缩水甘油醚(PEGDE)实现了PEDOT F的交联,相应小面积柔性器件的效率为14.86%.进一步制备了21.18 cm2的柔性有机光伏模组,其效率达到12.38%.关键词 空穴传输层；PEDOT F；交联；银纳米线；柔性有机太阳能电池中图分类号 TM914 文献标志码 A doi：10.7503/cjcu20230069Cross-linking PEDOT F Hole-transporting Layer to Enhance Photovoltaic Performance of Flexible Organic Solar CellsWEI Wanxia#，ZHOU Xianmin#，DONG Xinyun，LIU Tiefeng，XIE Cong，CHENG Jingyu，CHEN Jianping，LU Xin，FENG Kai，ZHOU Yinhua*（Wuhan National Laboratory for Optoelectronics，Huazhong University of Science and Technology，Wuhan 430074，China）Abstract Silver nanowires（AgNWs）are important printable top electrodes in flexible organic solar cells（OSCs）.However，when fabricating AgNWs from ethanol solution，it could cause damage on the hole-transporting layer below due to washing out.In this work，we propose a cross-linking strategy on the hole-transporting layer of poly（3，4-ethylenedioxythiophene）perfluorinated sulfonic acid ionomer（PEDOT F）to improve its alcohol resistance.By introducing a cross-linker of poly（ethylene glycol）diglycidyl ether（PEGDE），PEDOT：F was successfully cross-linked.Based on the cross-linked PEDOT F hole-transporting layer，small-area flexible OSCs（0.041 cm2）showed power conversion efficiency of 14.86%.Flexible organic solar module（21.18 cm2）was then fabricated and an efficiency of 12.38%was achieved.Keywords Hole-transporting layer；PEDOT F；Cross-linking；Silver nanowires；Flexible organic solar cell1 IntroductionIn recent years，organic solar cells（OSCs）have attracted intensive research for the possibility as low-cost 收稿日期：2023-02-17.网络首发日期：2023-04-22.联系人简介：周印华,男,博士,教授,主要从事有机光电材料与器件方面的研究.E-mail:yh_基金项目：国家自然科学基金(批准号:52273180)资助.Supported by the National Natural Science Foundation of China(No.52273180).#共同第一作者.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES高 等 学 校 化 学 学 报研究论文Chem.J.Chinese Universities,2023,44(7),2023006920230069(2/8)energy source，and the power conversion efficiency has reached around 20%15.On the further demand of commercial application，it is important to fabricate flexible large-area OSCs611.The widely used transparent electrode indium-tin oxide（ITO）is not applicable to flexible devices due to its rigidity and brittleness12，13.Other transparent electrodes have been chose as alternatives for ITO，such as thin metal films11，carbon materials14，conductive polymer（PEDOT PSS）15，16 and silver nanowires（AgNWs）17，18，etc.Solution-processed AgNWs have been investigated for the high electrical conductivity and transmittance，which perform on par with ITO as transparent electrodes in devices13，18.AgNWs have excellent mechanical flexibility and thus exhibit outstanding performance in bendable flexible OSCs.Large surface roughness is a major limitation for its application as bottom electrodes in large-area devices.Fabricating top-illuminated devices with AgNWs as the top electrode can avoid the problem of roughness.Printed silver nanowires as top electrodes have been successfully achieved in organic solar modules1921.Sun et al.8 fabricated a flexible all-solution-processed OSCs with an efficiency of 11.9%.Coating AgNWs solution could damage the underlying hole-transporting layer（HTL）.Fang et al.22 reported that AgNWs was transferred into a thin polydimethylsiloxane（PDMS）film and then laminated on solar cells as top electrodes，which avoided the wet contact of the AgNWs solutions on HTL.A water transfer printing method was carried out to prepare AgNWs film onto the HTL，which delivered a power conversion efficiency of 12.3%10.Enhancing the robustness of the HTL under the top AgNWs electrode is beneficial to endure the solution coating to increase the device efficiency and yield.Poly（3，4-ethylenedioxythiophene）perfluorinated sulfonic acid ionomer（PEDOT F）is an effective HTL for its high work function，good wetting and compatibility with efficient non-fullerene organic photovoltaic active layers as reported in our previous work23.PEDOT F is alcohol-dispersed，and the top AgNWs electrode is also typically alcohol-processed.The processing solvents are not orthogonal.That causes efficiency loss of the devices with AgNWs as the solution-processed top electrode.Methods to improve the robustness and solvent resistance of PEDOT F film need to be developed.In this work，we reported the cross-linking of PEDOT F film（denoted as c-PEDOT F）by using poly（ethylene glycol）diglycidyl ether（PEGDE）as a cross-linker to improve its solvent resistance.The cross-linking between PFSA counterion and PEGDE enhances the robustness of PEDOT F film.Ethanol-dispersed AgNWs can be directly deposited on the c-PEDOT F by solution coating.On this basis，we fabricated top-illuminated OSCs with solution-processed electrode of c-PEDOT F/