High‐Performance Binary All‐Polymer Solar Cells with Efficiency Over 18.3% Enabled by Tuning Phase Transition Kinetics

Author:

Bi Pengqing1ORCID,Zhang Tao2,Cui Yong2,Wang Jianqiu2,Qiao Jiawei3,Xian Kaihu45,Chua Xian Wei1ORCID,Chen Zhihao2,Goh Wei Peng1ORCID,Ye Long45,Hao Xiaotao3,Hou Jianhui2,Yang Le15ORCID

Affiliation:

1. Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way Singapore 138634 Singapore

2. State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China

3. School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan Shandong 250100 P. R. China

4. School of Materials Science & Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University Tianjin 300350 China

5. Department of Materials Science and Engineering National University of Singapore Singapore 117575 Singapore

Abstract

AbstractAll‐polymer solar cells (All‐PSCs) are considered to be the most promising candidates for realizing efficient and stable organic solar cells (OSCs). However, the challenge of controlling morphology has hindered the performance of All‐PSCs. Compared to small molecule acceptors, polymer acceptors play a more crucial role in obtaining an ideal morphology for All‐PSCs. The molecular weight of polymer acceptors is one of the key factors determining the morphological and mechanical properties as well as the interactions with donors. Herein, by using a monomer of PYIT (PYIT1) and PYITs with low (PYIT2) and high (PYIT3) molecular weights, the impact of molecular weight of the polymer acceptor is systematically investigated on the phase transition process, morphological, and photovoltaic properties. It is found that tuning the molecular weight effectively regulates the phase transition process of the polymer acceptor and its interaction with the polymer donor. This induces significant effects on the aggregation behaviors of the polymers. Appropriate molecular weight polymer acceptors can facilitate favorable phase separation morphology. With PBQx‐Cl as the donor and PYIT2 as acceptor, a high‐performance binary All‐PSC is achieved with an efficiency of 18.39%. This study provides deep insights into the performance enhancement of All‐PSCs through rational polymer acceptor design.

Funder

National Research Foundation

Chinese Academy of Sciences

Agency for Science, Technology and Research

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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