Liquid-Crystalline Small Molecules for Nonfullerene Solar Cells with High Fill Factors and Power Conversion Efficiencies

被引：51

作者：

Li, Huan ^{[1
,2
]}

Wu, Qiong ^{[1
,2
]}

Zhou, Ruimin ^{[1
,3
]}

Shi, Yanan ^{[1
,2
]}

Yang, Chen ^{[1
,2
]}

Zhang, Yajie ^{[1
]}

Zhang, Jianqi ^{[1
]}

Zou, Wenjun ^{[1
]}

Deng, Dan ^{[1
]}

Lu, Kun ^{[1
]}

Wei, Zhixiang ^{[1
]}

机构：

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

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

[3] Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100190, Peoples R China

来源：

ADVANCED ENERGY MATERIALS | 2019年 / 9卷 / 06期

基金：

中国国家自然科学基金;

关键词：

all-small-molecule; liquid crystalline; morphology; stacking orientation; FULLERENE; ELECTRON; POLYMER; DONOR;

D O I：

10.1002/aenm.201803175

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Compared with nonfullerene-based polymer solar cells, all-small-molecule solar cells normally show low power conversion efficiencies (PCEs) due to their low fill factors (FFs). Molecular stacking orientation and phase separation are the main factors affecting the performance of all-small-molecule solar cells. In this work, two liquid-crystalline small-molecule donors are designed and synthesized and a novel nonfullerene acceptor with good crystallinity developed. Owing to the face-on orientation of the component molecules and appropriate phase separation in the active layer, a high FF of over 70% and a PCE of 10.7% are obtained from the resulting solar cells; these values are among the best obtained thus far for all-small-molecule solar cells. The high FF reported here is significant for a further design of high-performance all-small-molecule solar cells.

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页数：7

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