Unique Energy Alignments of a Ternary Material System toward High-Performance Organic Photovoltaics

被引：122

作者：

Cheng, Pei ^{[1
]}

Wang, Jiayu ^{[2
]}

Zhang, Qianqian ^{[3
]}

Huang, Wenchao ^{[1
,4
]}

Zhu, Jingshuai ^{[2
]}

Wang, Rui ^{[1
]}

Chang, Sheng-Yung ^{[1
]}

Sun, Pengyu ^{[1
]}

Meng, Lei ^{[1
]}

Zhao, Hongxiang ^{[1
,4
]}

Cheng, Hao-Wen ^{[1
,4
]}

Huang, Tianyi ^{[1
]}

Liu, Yuqiang ^{[1
,4
]}

Wang, Chaochen ^{[1
]}

Zhu, Chenhui ^{[5
]}

You, Wei ^{[3
]}

Zhan, Xiaowei ^{[2
]}

Yang, Yang ^{[1
,4
]}

机构：

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

[2] Peking Univ, Key Lab Polymer Chem & Phys, Dept Mat Sci & Engn, Coll Engn,Minist Educ, Beijing 100871, Peoples R China

[3] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

[4] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA

[5] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

ADVANCED MATERIALS | 2018年 / 30卷 / 28期

基金：

美国国家科学基金会;

关键词：

energy level alignments; fullerene-free; nonfullerene; organic solar cells; ternary blends; POLYMER SOLAR-CELLS; POWER CONVERSION EFFICIENCY; NONFULLERENE ACCEPTORS; ELECTRON-ACCEPTOR; BLEND; HETEROJUNCTION; FULLERENE; DEVICES; RECOMBINATION; ENHANCEMENT;

D O I：

10.1002/adma.201801501

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Incorporating narrow-bandgap near-infrared absorbers as the third component in a donor/acceptor binary blend is a new strategy to improve the power conversion efficiency (PCE) of organic photovoltaics (OPV). However, there are two main restrictions: potential charge recombination in the narrow-gap material and miscompatibility between each component. The optimized design is to employ a third component (structurally similar to the donor or acceptor) with a lowest unoccupied molecular orbital (LUMO) energy level similar to the acceptor and a highest occupied molecular orbital (HOMO) energy level similar to the donor. In this design, enhanced absorption of the active layer and enhanced charge transfer can be realized without breaking the optimized morphology of the active layer. Herein, in order to realize this design, two new narrow-bandgap nonfullerene acceptors with suitable energy levels and chemical structures are designed, synthesized, and employed as the third component in the donor/acceptor binary blend, which boosts the PCE of OPV to 11.6%.

引用

页数：8

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