17% efficiency all-small-molecule organic solar cells enabled by nanoscale phase separation with a hierarchical branched structure

被引：166

作者：

Qin, Jinzhao ^{[1
,2
]}

Chen, Zhihao ^{[3
]}

Bi, Pengqing ^{[1
]}

Yang, Yang ^{[2
,4
]}

Zhang, Jianqi ^{[4
]}

Huang, Ziyun ^{[2
,4
]}

Wei, Zhixiang ^{[2
,4
]}

An, Cunbin ^{[1
]}

Yao, Huifeng ^{[1
]}

Hao, Xiaotao ^{[3
]}

Zhang, Tao ^{[1
]}

Cui, Yong ^{[1
]}

Hong, Ling ^{[1
,2
]}

Liu, Chenyu ^{[1
,2
]}

Zu, Yunfei ^{[1
,2
]}

He, Chang ^{[1
]}

Hou, Jianhui ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, State Key Lab Polymer Phys & Chem, Inst Chem, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China

[4] Natl Ctr Nanosci & Technol, Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2021年 / 14卷 / 11期

基金：

中国国家自然科学基金;

关键词：

HIGH-PERFORMANCE; FULLERENE; STRATEGY;

D O I：

10.1039/d1ee02124a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

For all small-molecule-based organic solar cells (SM-OSCs), it is very challenging to obtain a nanoscale bicontinuous network structure in the active layers, so their power conversion efficiencies (PCEs) still lag behind those of the polymer-based OSCs. In this work, highly efficient SM-OSCs based on a ternary bulk heterojunction (BHJ) layer of B1:BO-2Cl:BO-4Cl were constructed. Ternary cells with the three different BO-2Cl:BO-4Cl weight ratios exhibit higher PCEs than those of B1:BO-2Cl- and B1:BO-4Cl-based binary cells. The results obtained from the transient absorption, time-resolved photoluminescence spectroscopy and device physics analysis reveal that the ternary cell with the optimal composition (B1:BO-2Cl:BO-4Cl = 1 : 0.5 : 0.5 in weight ratio) exhibits faster charge transfer processes, suppressed geminate and non-geminate charge recombination, lower energetic disorder, and higher and more symmetric carrier mobilities than the two binary cells. The transmission electron microscopy measurement results reveal that the nanoscale bicontinuous interpenetrating network with a hierarchical branched structure can be fully evolved in the BHJ layer with the optimal ternary composition. As a result, the optimal ternary cell exhibits a PCE of 17.0% (certified to be 16.9%) and a fill factor of 0.78, which are the highest values obtained for SM-OSCs.

引用

页码：5903 / 5910

页数：8

共 42 条

[1] Efficient Electron Transport Layer Free Small-Molecule Organic Solar Cells with Superior Device Stability [J].