Single-Junction Organic Photovoltaic Cells with Approaching 18% Efficiency

被引：1642

作者：

Cui, Yong ^{[1
,2
]}

Yao, Huifeng ^{[1
]}

Zhang, Jianqi ^{[3
]}

Xian, Kaihu ^{[1
,2
]}

Zhang, Tao ^{[1
]}

Hong, Ling ^{[1
,2
]}

Wang, Yuming ^{[1
,4
]}

Xu, Ye ^{[1
,2
]}

Ma, Kangqiao ^{[1
]}

An, Cunbin ^{[1
]}

He, Chang ^{[1
]}

Wei, Zhixiang ^{[2
,3
]}

Gao, Feng ^{[4
]}

Hou, Jianhui ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Chem, CAS Res Educ Ctr Excellence Mol Sci, Beijing Natl Lab Mol Sci,State Key Lab Polymer Ph, Beijing 100190, Peoples R China

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

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

[4] Linkoping Univ, Dept Phys Chem & Biol, Linkoping, Sweden

来源：

ADVANCED MATERIALS | 2020年 / 32卷 / 19期

基金：

瑞典研究理事会; 中国国家自然科学基金; 中国博士后科学基金;

关键词：

molecular modification; nonfullerene acceptors; organic photovoltaic cells; power conversion efficiency; POLYMER SOLAR-CELLS; ACCEPTOR;

D O I：

10.1002/adma.201908205

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Optimizing the molecular structures of organic photovoltaic (OPV) materials is one of the most effective methods to boost power conversion efficiencies (PCEs). For an excellent molecular system with a certain conjugated skeleton, fine tuning the alky chains is of considerable significance to fully explore its photovoltaic potential. In this work, the optimization of alkyl chains is performed on a chlorinated nonfullerene acceptor (NFA) named BTP-4Cl-BO (a Y6 derivative) and very impressive photovoltaic parameters in OPV cells are obtained. To get more ordered intermolecular packing, the n-undecyl is shortened at the edge of BTP-eC11 to n-nonyl and n-heptyl. As a result, the NFAs of BTP-eC9 and BTP-eC7 are synthesized. The BTP-eC7 shows relatively poor solubility and thus limits its application in device fabrication. Fortunately, the BTP-eC9 possesses good solubility and, at the same time, enhanced electron transport property than BTP-eC11. Significantly, due to the simultaneously enhanced short-circuit current density and fill factor, the BTP-eC9-based single-junction OPV cells record a maximum PCE of 17.8% and get a certified value of 17.3%. These results demonstrate that minimizing the alkyl chains to get suitable solubility and enhanced intermolecular packing has a great potential in further improving its photovoltaic performance.

引用

页数：7

共 48 条

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