End group tuning in small molecule donors for non-fullerene organic solar cells

作者:Guo, J (Guo, Jie)[ 1 ] ; Balakirev, DO (Balakirev, Dmitry O.)[ 2 ] ; Gu, CJ (Gu, Chengjun)[ 3,4 ] ; Peregudova, SM (Peregudova, Svetlana M.)[ 5 ] ; Ponomarenko, SA (Ponomarenko, Sergei A.)[ 2 ] ; Liu, ZT (Liu, Zhitian)[ 4 ] ; Luponosov, YN (Luponosov, Yuriy N.)[ 2 ] ; Min, J (Min, Jie)[ 3,6,7 ] ; Lei, AW (Lei, Aiwen)[ 1 ]

DYES AND PIGMENTS

卷: 175

文献号: 108078

DOI: 10.1016/j.dyepig.2019.108078

出版年: APR 2020

文献类型:Article

摘要

Two novel small molecules, which consist of electron donating benzodithiophene core bridged through bithiophene n-spacer with terminal either dicyanovinyl (DCV-Me) or n-butyl cyanoester (CNAB) electron-withdrawing groups, were designed and used as donor materials for all-small molecule OSCs (all-SM-OSCs) with a non-fullerene acceptor (IDIC). The novel donor oligomers were firstly characterized by thermal gravimetric analysis, differential scanning calorimetry, UV-Vis spectroscopy, and cyclic voltammetry as well as studied by density functional theory calculations. The simple change of the DCV-Me to CNAB group leads to more pronounced crystallinity, higher solubility and higher energy levels in the donor BDT-2T-CNAB. The photovoltaic devices based on the BDT-2T-CNAB:IDIC blend exhibit higher short-circuit current (J(sc)) and fill factor, and thus much higher power conversion efficiency (PCE) of 6.17% than those of BDT-2T-DCV-Me:IDIC devices (1.56%). Compared to the BDT-2T-DCV-Me system, the BDT-2T-CNAB based device shows smoother film surface morphology, and superior exciton dissociation, charge generation and charge carrier mobilities as well as lower non-geminate recombination losses. The results clearly demonstrate that the design of new small molecule donors for high-performance all-SM-OSCs should aim to choose suitable end acceptor units, among which the alkyl cyanoester groups are one of the most promising.

关键词

KeyWords Plus:ELECTRON-ACCEPTORS; PERFORMANCE; EFFICIENCY; OPTIMIZATION

作者信息

通讯作者地址:

Wuhan University Wuhan Univ, Coll Chem & Mol Sci, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China.

Russian Academy of Sciences Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences Russian Acad Sci, Enikolopov Inst Synthet Polymer Mat, Profsoyuznaya St 70, Moscow 117393, Russia.

Zhengzhou University Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China.

通讯作者地址: Lei, AW (通讯作者)

Wuhan Univ, Coll Chem & Mol Sci, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China.

通讯作者地址: Luponosov, YN (通讯作者)

Russian Acad Sci, Enikolopov Inst Synthet Polymer Mat, Profsoyuznaya St 70, Moscow 117393, Russia.

通讯作者地址: Min, J (通讯作者)

Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China.

地址:

[ 1 ]‎ Wuhan Univ, Coll Chem & Mol Sci, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China

[ 2 ]‎ Russian Acad Sci, Enikolopov Inst Synthet Polymer Mat, Profsoyuznaya St 70, Moscow 117393, Russia

[ 3 ]‎ Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China

[ 4 ]‎ Wuhan Inst Technol, Sch Mat Sci & Engn, Hubei Engn Technol Res Ctr Optoelect & New Energy, Wuhan 430205, Peoples R China

[ 5 ]‎ Russian Acad Sci, Nesmeyanov Inst Organoelement Cpds, Vavilova St 28, Moscow 119991, Russia

[ 6 ]‎ Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China

[ 7 ]‎ Chinese Acad Sci, Shanghai Inst Organ Chem, Key Lab Organofluorine Chem, Beijing, Peoples R China

电子邮件地址:luponosov@ispm.ru; min.jie@whu.edu.cn; aiwenlei@whu.edu.cn