Understanding the Composition of Layer-by-Layer Deposited Active Layer at Buried Bottom Surface

Kai Feng; Linya Chen; Jingyu ChengWanxia WeiYang LiuCong XieXin LuHonggang GuSixing XiongYinhua Zhou

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Understanding the Composition of Layer-by-Layer Deposited Active Layer at Buried Bottom Surface

机译：Understanding the Composition of Layer-by-Layer Deposited Active Layer at Buried Bottom Surface

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Layer-by-layer (LbL) coating is becoming a widely used method to fabricate nonfullerene active layer films for organic solar cells. However, the vertical compositional distribution of the LbL-coated active layer, particularly at the buried bottom surface, is not clear yet. In common sense, it is believed that the LbL-coating yields a donor–mixture–acceptor (D–m–A) vertical distribution in the active layer, i.e., a thin polymer donor layer at the bottom surface, a thin acceptor layer at the top surface and a donor-acceptor mixture in the middle. In this study, it is shown that the LbL active layer vertically is an entire donor:acceptor mixture. A pure layer of polymer donor doesn’t exist at the bottom surface. The LbL active layer delivers high performance in both conventional and inverted device structures. A thin polymer layer with different thicknesses (2, 6, 12 nm) is inserted at the bottom surface to study their effects on the device performance. Those inserted layers substantially deteriorate the device’s performance. Furthermore, the assumption is further confirmed by X-ray photoelectron spectroscopy measurement on the exposed “originally buried” surface. This study sheds light on understanding the vertical compositional distribution of active layer via layer-by-layer solution processing.

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《Advanced functional materials》 |2023年第21期|2214956.1-2214956.6|共6页
作者
Kai Feng; Linya Chen; Jingyu ChengWanxia WeiYang LiuCong XieXin LuHonggang GuSixing XiongYinhua Zhou;
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作者单位

Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074, China;

School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074, China,Innovation Institute Huazhong University of Science and Technology Wuhan 430074, China;

State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074, China;

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正文语种英语
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heterojunctions; layer-by-layer coatings; organic solar cells; vertical composition distributions;

Understanding the Composition of Layer-by-Layer Deposited Active Layer at Buried Bottom Surface

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