High‐Performance Green Thick‐Film Ternary Organic Solar Cells Enabled by Crystallinity Regulation

Zhao, Heng; Xue, Jingwei; Wu, Hongbo; Lin, Baojun; Cai, Yuhang; Zhou, Ke; Yun, Daqin; Tang, Zheng; Ma, Wei

doi:10.1002/adfm.202210534

High‐Performance Green Thick‐Film Ternary Organic Solar Cells Enabled by Crystallinity Regulation

Journal Article · 21 November 2022 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202210534· OSTI ID:2422686

Zhao, Heng ^[1]; Xue, Jingwei ^[1]; Wu, Hongbo ^[2]; Lin, Baojun ^[1]; Cai, Yuhang ^[3]; Zhou, Ke ^[1]; Yun, Daqin ^[3]; Tang, Zheng ^[2]; ^[1]

State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi’ an 710049 China
Center for Advanced Low‐dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China
College of Energy Xiamen University Xiamen 361005 China

Abstract

The power conversion efficiency (PCE) of organic solar cells (OSCs) has reached high values of over 19%. However, most of the high‐efficiency OSCs are fabricated by spin‐coating with toxic solvents and the optimal photoactive layer thickness is limited to 100 nm, limiting practical development of OSCs. It is a great challenge to obtain ideal morphology for high‐efficiency thick‐film OSCs when using non‐halogenated solvents due to the unfavorable film formation kinetics. Herein, high‐efficiency ternary thick‐film (300 nm) OSCs with PCE of 15.4% based on PM6:BTR‐Cl:CH1007 are fabricated by hot slot‐die coating using non‐halogenated solvent (o‐xylene) in the air. Compared to PM6:BTR‐Cl:Y6 blends, the stronger pre‐aggregation of CH1007 in solution induces the earlier aggregation of CH1007 molecules and longer aggregation time, and thus results in high and balanced crystallinity of donors and acceptor in CH1007‐based ternary film, which led to high‐carrier mobility and suppressed charge recombination. The ternary strategy is further used to fabricate high‐efficiency, thick‐film, large‐area, and flexible devices processed from non‐halogenated solvents, paving the way for industrial development of OSCs.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 2422686

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 5 Vol. 33; ISSN 1616-301X

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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