Layer-by-layer processed binary all-polymer solar cells with efficiency over 16% enabled by finely optimized morphology

被引：100

作者：

Zhang, Yue ^{[1
]}

Wu, Baoqi ^{[1
]}

He, Yakun ^{[2
]}

Deng, Wanyuan ^{[1
]}

Li, Jingwen ^{[1
]}

Li, Junyu ^{[3
]}

Qiao, Nan ^{[4
]}

Xing, Yifan ^{[4
]}

Yuan, Xiyue ^{[1
]}

Li, Ning ^{[2
]}

Brabec, Christoph J. ^{[2
]}

Wu, Hongbin ^{[1
]}

Lu, Guanghao ^{[4
]}

Duan, Chunhui ^{[1
,5
,6
]}

Huang, Fei ^{[1
]}

Cao, Yong ^{[1
]}

机构：

[1] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China

[2] Friedrich Alexander Univ Erlangen Nurnberg, Inst Mat Elect & Energy Technol I MEET, Dept Mat Sci & Engn, Martensstr 7, D-91058 Erlangen, Germany

[3] Eindhoven Univ Technol, Mol Mat & Nanosyst, Inst Complex Mol Syst, NL-5600 MB Eindhoven, Netherlands

[4] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Xian 710054, Peoples R China

[5] Guangdong Hong Kong Macao Joint Lab Optoelect & M, Guangzhou 510640, Peoples R China

[6] Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China

来源：

NANO ENERGY | 2022年 / 93卷

基金：

中国国家自然科学基金;

关键词：

All-polymer solar cells; High-efficiency; Layer-by-layer processing; Active layer morphology; Vertical composition distribution; PERFORMANCE; ACCEPTOR; ORIENTATION; GENERATION; STABILITY; PACKING;

D O I：

10.1016/j.nanoen.2021.106858

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：

Optimal active layer morphology is a prerequisite for high-efficiency all-polymer solar cells (all-PSCs). Herein, we report that the vertical phase separation as well as microstructures of the polymer donor and acceptor can be finely optimized in layer-by-layer (LbL) processed all-PSCs. By using 1-chloronaphthalene as the solvent additive during the deposition of the polymer acceptor in the top layer and applying thermal annealing on the entire active layer, bulk-heterojunction like morphology with favorable vertical composition distribution, improved lamellar ordering of the polymer donor (PBDB-T), and the formation of polymer fibrils of the polymer acceptor (PYT) have been realized simultaneously. This favorable morphology led to greatly enhanced exciton splitting efficiency, reduced trap density, improved charge transport, and suppressed charge recombination loss. As a result, the LbL processed all-PSCs of PBDB-T/PYT afforded a power conversion efficiency (PCE) of 16.05%, which is one of the highest PCEs for binary all-PSCs. Moreover, a fill factor (FF) of 0.77 has been obtained, which is the highest value for all-PSCs based on polymerized small molecule acceptors up to date. This work demonstrates an effective strategy for morphology optimization of LbL processed all-PSCs, which will greatly contribute to efficiency breakthrough.

引用

页数：11

共 66 条

[11] Highlight The new era for organic solar cells: non-fullerene small molecular acceptors [J].