Non-Halogenated Solvent-Processed High-Efficiency Polymer Solar Cells:the Role of Diphenyl Ether in Morphology,Light-Trapping,Transport Properties

作     者：Yi Chen Xiangxu Ding Ge Wang Songwen Xiao Xin Liu Zihan Zhu Chen Wang Shanpeng Wen Yi Chen;Xiangxu Ding;Ge Wang;Songwen Xiao;Xin Liu;Zihan Zhu;Chen Wang;Shanpeng Wen

作者机构：State Key Laboratory On Integrated Optoelectronics and College of Electronic Science and EngineeringJilin UniversityChangchun 130012China 

出 版 物：《Transactions of Tianjin University》 (天津大学学报（英文版）)

年 卷 期：2022年第28卷第5期

页      面：423-432页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(No.52073115) the Project of Science and Technology Development Plan of Jilin Province(No.20200201085JC) China Postdoctoral Science Foundation(No.2019M661208)。 

主　　题：Green solvents Diphenyl ether Morphology Charge extraction Polymer solar cells 

摘      要：There is an urgent need to use green non-halogenated solvents to prepare polymer solar cells(PSCs) for industrialization.It is time-consuming but necessary to find a suitable non-halogenated solvent/additive combination for a given donor:acceptor materials system.In this research,we report a non-halogenated binary solvent system toluene/diphenyl ether(DPE) for the PBDTT-DTffBT:PC_(71)BM and PM6:Y6 blending systems that exhibit comparable power conversion efficiency(PCE) to that of devices prepared with halogenated solvents.The nano scale morphology indicates that blending film processed solely with toluene has poor phase segregation and a rough surface,which hinders charge separation and interfacial contact.Besides,the total absorption spectra revealed significant light-trapping losses in the toluene-processed solar cells,resulting in low photocurrent generation.DPE incorporation addresses these issues and significantly improves the short-circuit current density and fill factor.Moreover,non-halogen solvent-processed devices exhibit high hole mobility and low transporting impedance properties.The present study enriches the families of eco-friendly,high-efficiency PSCs fabricated using nonhalogenated solvents.