Improving Photovoltaic Performance of Non-Fullerene Polymer Solar Cells Enables by Fine-Tuning Blend Microstructure via Binary Solvent Mixtures

作者:Yu, Y (Yu, Yue)[ 1 ] ; Sun, R (Sun, Rui)[ 1 ] ; Wang, T (Wang, Tao)[ 1 ] ; Yuan, XX (Yuan, Xinxin)[ 1 ] ; Wu, Y (Wu, Yao)[ 1 ] ; Wu, Q (Wu, Qiang)[ 1 ] ; Shi, MM (Shi, Mumin)[ 1 ] ; Yang, WY (Yang, Wenyan)[ 1 ] ; Jiao, XC (Jiao, Xuechen)[ 2 ] ; Min, J (Min, Jie)[ 1,3,4 ]

ADVANCED FUNCTIONAL MATERIALS

文献号: 2008767

DOI: 10.1002/adfm.202008767

Early access icon在线发表日期: DEC 2020

文献类型:Article; Early Access

摘要

Studies of the relationship between blend microstructure and photovoltaic performance are becoming more common, which is a prerequisite for rationally improving device performance. Non-fullerene acceptors usually have planar backbone conformation and strong intermolecular packing, normally resulting in excessive phase separation. Herein, an effective co-solvent blending strategy to turn the molecular organization of a chlorinated small molecule acceptor Y6-2Cl and phase separation of the corresponding active layer with PM6 as donor is demonstrated. The in situ photoluminescence measurements and relevant morphological characterizations illustrate that the film-forming process is fine-turned when using the mixtures of chloroform (CF) and chlorobenzene (CB) solvents, and the blend showed high domain purity with suitable phase-separated networks. Thus, better exciton dissociation and charge generation, more balanced charge transport, and less recombination loss are obtained in the co-solvent blade-coated devices. As a result, a maximum power conversion efficiency (PCE) of 16.17% is achieved, which is much higher than those of CF- and CB-bladed devices (14.08% and 11.44%, respectively). Of note is that the use of this co-solvent approach in the other two high-performance photovoltaic systems is also confirmed, demonstrating its good generality of employing in the printing organic solar cells.

关键词

作者关键词:as‐ cast solar cells; binary solvent; blade coating; in situ photoluminescence; organic solar cells

KeyWords Plus:MOLECULE; LAYER; OPTIMIZATION; MORPHOLOGY; EFFICIENCY; ACCEPTORS; PURITY; SIZE

作者信息

通讯作者地址:

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

Chinese Academy of Sciences Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.

Zhengzhou University Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, 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: Min, J (通讯作者)

Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.

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, Inst Adv Studies, Wuhan 430072, Peoples R China

[ 2 ]‎ Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

[ 3 ]‎ Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

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

电子邮件地址:min.jie@whu.edu.cn