Thick-Film Organic Solar Cells Achieving over 11% Efficiency and Nearly 70% Fill Factor at Thickness over 400 nm

作者:Gao, W (Gao, Wei)[ 1,2 ] ; An, QS (An, Qiaoshi)[ 3 ] ; Hao, MH (Hao, Minghui)[ 1 ] ; Sun, R (Sun, Rui)[ 4 ] ; Yuan, J (Yuan, Jian)[ 5 ] ; Zhang, FJ (Zhang, Fujun)[ 3 ] ; Ma, W (Ma, Wei)[ 5 ] ; Min, J (Min, Jie)[ 4 ] ; Yang, CL (Yang, Chuluo)[ 1,2 ]

ADVANCED FUNCTIONAL MATERIALS

卷: 30 期: 10

文献号: 1908336

DOI: 10.1002/adfm.201908336

出版年:MAR 2020

在线发表日期: JAN 2020

文献类型:Article

摘要

Thickness-insensitive small molecule acceptors (SMAs) are still a great challenge for developing thick-film organic solar cells (OSCs) towards practical use. Herein, two SMAs, MF1 and MF2, are designed and synthesized by employing a bifunctional end group with fluorine and methyl moieties. Combined with fused-ring cores with alkyl side chains, both MF1 and MF2 exhibit ordered pi-pi stacking and high charge carrier mobilities in neat and blend films. The champion devices based on PM7:MF1 and PM7:MF2 deliver high power conversion efficiencies (PCEs) of 12.4% and 13.7%, and high fill factors (FFs) of 78.3% and 74.5%, respectively. With increasing active layer thickness, the FFs of the OSCs decrease relatively slowly, demonstrating the preferrable properties of MF1 and MF2 in terms of their thickness insensitivity, especially for MF1. As a result, the two thick-film OSCs achieve over 11% PCEs at an active layer thickness over 400 nm (an FF close to 70% for PM7:MF1) and over 10% PCEs when the thickness is increased up to 500 nm. These are the highest PCEs among OSCs with such active layer thicknesses to date. This work reveals a molecular design strategy by reasonably combining fluorine and methyl together to simultaneously enhance charge carrier mobilities and fine-tune the morphology, which is beneficial to achieve high-performance thick-film OSCs.

关键词

作者关键词:non-fullerene acceptor; organic solar cells; thick film; thickness insensitive

KeyWords Plus:ELECTRON-ACCEPTORS; POLYMER; FULLERENE; FABRICATION; MORPHOLOGY; ENERGY

作者信息

通讯作者地址:

Shenzhen University Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Peoples R China.

Wuhan University Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.

Beijing Jiaotong University Beijing Jiaotong Univ, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China.

Wuhan University Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

Xi'an Jiaotong University Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.

通讯作者地址: Yang, CL (通讯作者)

Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Peoples R China.

通讯作者地址: Yang, CL (通讯作者)

Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.

通讯作者地址: Zhang, FJ (通讯作者)

Beijing Jiaotong Univ, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China.

通讯作者地址: Min, J (通讯作者)

Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

通讯作者地址: Ma, W (通讯作者)

Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.

地址:

[ 1 ]‎ Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Polymer Sci & Technol, Shenzhen 518060, Peoples R China

[ 2 ]‎ Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China

[ 3 ]‎ Beijing Jiaotong Univ, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China

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

[ 5 ]‎ Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

电子邮件地址:fjzhang@bjtu.edu.cn; msewma@mail.xjtu.edu.cn; min.jie@whu.edu.cn; clyang@szu.edu.cn