A-DA′D-A Type Acceptor with a Benzoselenadiazole A′-Unit Enables Efficient Organic Solar Cells

被引：40

作者：

Li, Zechen ^{[1
,4
]}

Li, Xiaojun ^{[1
]}

Xue, Jingwei ^{[2
]}

Zhang, Jinyuan

Zhu, Can ^{[1
,4
]}

Li, Jing ^{[3
]}

Ma, Wei ^{[2
]}

Meng, Lei ^{[1
,4
]}

Li, Yongfang ^{[1
,4
,5
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China

[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[3] Tech Inst Phys & Chem, Chinese Acad Sci, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China

[4] Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China

[5] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Lab Adv Optoelect Mat, Suzhou Key Lab Novel Semicond Optoelect Mat & Devi, Suzhou 215123, Jiangsu, Peoples R China

来源：

ACS ENERGY LETTERS | 2023年 / 8卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Conversion efficiency - Energy gap - Molecular orbitals - Organic solar cells - Red Shift - Selenium compounds;

D O I：

10.1021/acsenergylett.3c00743

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：

A new A-DA ' D-A structured narrow bandgap small molecular acceptor (SMA) Se46 was designed and synthesized by using benzoselenadiazole as the A ' unit and branched 2-butyloctyl as upper side chains in its DA ' D central fused ring. It was found that Se46 shows red-shifted absorption compared to that of L8-BO with a benzothiadiazole A ' unit and an up-shifted lowest unoccupied molecular orbital energy level compared to that of Y6 with a benzothiadiazole A ' unit and linear n-C11H23 upper side chains. The organic solar cells (OSCs) based on PM6:Se46 demonstrate a high power conversion efficiency over 18% with an increased short circuit current density compared to that of the L8-BO-based devices and a higher open circuit voltage than that of the Y6-based devices. The results indicate that the synergetic modification of selenium substitution in the A ' unit and branched alkyl upper side chain is an effective strategy to further promote photovoltaic performance for the narrow bandgap A-DA ' D-A type acceptors.

引用

页码：2488 / 2495

页数：8

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