A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss

被引：0

作者：

Bin Kan ^{[1
]}

Huanran Feng ^{[1
]}

Huifeng Yao ^{[2
]}

Meijia Chang ^{[1
]}

Xiangjian Wan ^{[1
]}

Chenxi Li ^{[1
]}

Jianhui Hou ^{[2
]}

Yongsheng Chen ^{[1
]}

机构：

[1] State Key Laboratory and Institute of Elemento-Organic Chemistry, The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, College of Chemistry, Nankai University

[2] State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences

来源：

Science China(Chemistry) | 2018年 / 10期

关键词：

small-molecule acceptor; low-bandgap; chlorinated; high performance;

D O I：

暂无

中图分类号：

TM914.4 [太阳能电池];

学科分类号：

080502 ;

摘要：

A new acceptor-donor-acceptor(A-D-A) type small-molecule acceptor NCBDT-4 Cl using chlorinated end groups is reported.This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4 Cl shows a power conversion efficiency(PCE) of 13.1%without any post-treatment, which represents the best result for all as-cast organic solar cells(OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density(Jsc) of 22.35 m A cm-2 and a fill-factor(FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs.

引用

页码：1307 / 1313

页数：7