二碘辛烷热预处理增强PEDOT光伏电池的性能  

Performance Enhancement of PEDOT-based Organic Solar Cells via Thermal Pretreating Diiodooctane

作　　者：高博文 尧敬元 李昱达 GAO Bowen;YAO Jingyuan;LI Yuda(School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学化工与制药学院,湖北武汉430205

出　　处：《化工技术与开发》2024年第6期10-14,26,共6页Technology & Development of Chemical Industry

基　　金：武汉工程大学研究生创新基金(CX2022064)。

摘　　要：1,8-二碘辛烷(DIO)常作为添加剂,用于有机光伏电池活性层的形貌调控,以实现高光电转换效率(PCE)。但较高的化学活性,会造成聚(3,4-乙撑二氧噻吩)(PEDOT)的空穴传输层还原脱掺杂,导致电池性能受损。本文采用热预处理方法,部分脱除DIO碘官能团,以降低其对PEDOT的还原活性,同时保留其对活性层的形貌优化功能,实现有机光伏电池PCE的显著提升。实验结果表明,随着DIO的热预处理时间延长,其对PEDOT还原脱掺杂的效果减弱,PEDOT薄膜面外的电导率由4.75×10^(-6)S·cm^(-1)逐渐提高到5.43×10^(-6)S·cm^(-1),功函数也随之提高,电池的PCE由17.08%提高至17.53%。随着热预处理时间的进一步延长,碘官能团的脱除过多,会导致其调控活性层形貌的功效变弱,电池的PCE回落至17.43%。1,8-diiodooctane(DIO)was widely used to optimize the morphology of the active layer in organic solar cells(OSCs),thereby enhanced their power conversion efficiencies(PCEs).However,its high chemical activity led to an reduction of the poly(3,4-ethylenedioxythiophene)(PEDOT)hole transport layer,compromised the device performance.A thermal pretreatment method was employed to partially eliminate the iodine functional group from DIO chains,thereby mitigating its reductive activity towards PEDOT.The experimental results demonstrated that an increase in pretreatment duration led to a gradual enhancement of the doping level in the DIO-treated PEDOT film,accompanied by a significant elevation in its out-of-plane conductivity and work function.As a result,the PCE of PEDOT-based OSCs increased from 17.08%to 17.53%.With the further increase of thermal pretreatment time,excessive removal of iodine functional groups occurred,resulting in a diminished ability to regulate the morphology of the active layer and consequently causing a decline in the PCE of PEDOT-based OSCs to 17.43%.

关 键 词：聚(3 4-乙撑二氧噻吩) 1 8-二碘辛烷 空穴传输层 还原脱掺杂 有机光伏电池 

分 类 号：TM914[电气工程—电力电子与电力传动]