Manipulating Polymer Backbone Configuration via Halogenated Asymmetric End-Groups Enables Over 18% Efficiency All-Polymer Solar Cells

Jing Guo; Xinxin Xia; Beibei Qiu; Jinyuan Zhang; Shucheng Qin; Xiaojun Li; Wenbin Lai; Xinhui Lu; Lei Meng; Zhanjun Zhang; Yongfang Li

doi:10.1002/adma.202211296

Manipulating Polymer Backbone Configuration via Halogenated Asymmetric End-Groups Enables Over 18% Efficiency All-Polymer Solar Cells

Adv Mater. 2023 Apr;35(16):e2211296. doi: 10.1002/adma.202211296. Epub 2023 Mar 9.

Authors

Jing Guo^{1

2}, Xinxin Xia³, Beibei Qiu⁴, Jinyuan Zhang¹, Shucheng Qin^{1

2}, Xiaojun Li¹, Wenbin Lai^{1

2}, Xinhui Lu³, Lei Meng^{1

2}, Zhanjun Zhang², Yongfang Li^{1

2

5}

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
² School of Chemical Science, University of Chinese Academy of Sciences, Beijing, 100049, China.
³ Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, 999077, China.
⁴ Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province, College of Physics and Electronic Information Engineering, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China.
⁵ Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, China.

PMID: 36689736
DOI: 10.1002/adma.202211296

Abstract

High-performance all-polymer solar cells (all-PSCs) deeply rely on the joint contributions of desirable optical absorption, adaptive energy levels, and appropriate morphology. Herein, two structural analogous polymerized small-molecule acceptors (PSMAs), PYFCl-T and PYF&PYCl-T, are synthesized, and then incorporated into the PM6:PY-IT binary blends to construct ternary all-PSCs. Due to the superior compatibility of PY-IT and PYFCl-T, the ternary all-PSC based on PM6:PY-IT:PYFCl-T with 10 wt% PYFCl-T, presents higher and more balanced charge mobility, suppressed charge recombination, and faster charge-transfer kinetics, resulting in an outstanding power conversion efficiency (PCE) of 18.12% with enhanced J_sc and FF, which is much higher than that (PCE of 16.09%) of the binary all-PSCs based on PM6:PY-IT. Besides, the ternary all-PSCs also exhibit improved photostability. The conspicuous performance enhancement principally should give the credit to the miscibility-driven phase optimization of the donor and acceptor. These findings highlight the significance of polymer-backbone configuration modulation of PSMAs in morphology optimization toward boosting the device properties of all-PSCs.

Keywords: all-polymer solar cells; halogenated asymmetric structures; morphology; polymerized small-molecule acceptors; ternary strategies.

Abstract

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