High-efficiency organic solar cells processed from a halogen-free solvent system  

作　　者：Yueling Su Zicheng Ding Rui Zhang Weibing Tang Wenliang Huang Zhichao Wang Kui Zhao Xiaochen Wang Shengzhong(Frank)Liu Yongfang Li 

机构地区：[1]Key Laboratory of Applied Surface and Colloid Chemistry,Ministry of Education,Shaanxi Key Laboratory for Advanced Energy Devices,Shaanxi Engineering Lab for Advanced Energy Technology,School of Materials Science and Engineering,Shaanxi Normal University,Xi’an,710119,China [2]Department of Physics,Chemistry and Biology(IFM),Linköping University,Linköping,Sweden [3]Dalian National Laboratory for Clean Energy,iChEM,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,116023,China [4]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Science China Chemistry》2023年第8期2380-2388,共9页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(51873204,51933010,51773046);the 111 Project(B21005);the National 1000-Talent-Plan Program(1110010341);the Science and Technology Program of Shaanxi Province(2021KJXX-13);the Fundamental Research Funds for the Central Universities(GK202103104);the GIWAXS measurement at beamline 7.3.3 at the Advanced Light Source,LBNL,which is supposed by the Director,Office of Science,Office of Basic Energy Sciences,of the US Department of Energy(DE-AC02-05CH11231)。

摘　　要：The use of non-halogenated solvents for the green manufacture of high-efficiency organic solar cells(OSCs)is important for their future application.However,the power conversion efficiency(PCE)of the non-halogenated solvent processed OSCs is generally lower than their halogenated counterpart due to the poor film microstructure caused by the solubility issue.Herein,we propose a halogen-free solvent system to optimize film microstructure of the photovoltaic blend based on the polymer donor D18and small-molecule acceptor(SMA)L8-BO towards high-efficiency OSCs.The solvent system is consisted of a main solvent carbon disulfide and an additive paraxylene,where the former ensures the good solution-processability and promotes the solution aggregation of L8-BO,and the latter can finely control the phase-separation process by selectively dissolving the SMA.This solvent combination robustly produces a high-quality active layer,i.e.,the bicontinuous networks of donor and acceptor with nano-sized phase-separation and strongπ-πstacking.With the effective charge generation,transport and collection,the resulting device from the non-halogenated solvent system shows a high PCE of 17.50%,which is comparable to that of the device prepared from the halogenated solvent chloroform(ca.17.11%).This article proposes a new strategy for the green fabrication of high-efficiency OSCs to accelerate their industrialization.

关 键 词：organic solar cells small molecule acceptor film microstructure non-halogenated solvent solvent engineering 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]