Sub-5 nm single crystalline organic p–n heterojunctions

Mingchao Xiao, Jie Liu, Chuan Liu, Guangchao Han, Yanjun Shi, Chunlei Li, Xi Zhang, Yuanyuan Hu, Zitong Liu, Xike Gao, Zhengxu Cai, Ji Liu, Yuanping Yi (), Shuai Wang (), Dong Wang, Wenping Hu, Yunqi Liu, Henning Sirringhaus and Lang Jiang ()
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Mingchao Xiao: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Jie Liu: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Chuan Liu: Sun Yat-sen University
Guangchao Han: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Yanjun Shi: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Chunlei Li: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Xi Zhang: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Yuanyuan Hu: Hunan University
Zitong Liu: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Xike Gao: Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences
Zhengxu Cai: Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology
Ji Liu: Southern University of Science and Technology
Yuanping Yi: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Shuai Wang: Huazhong University of Science and Technology
Dong Wang: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Wenping Hu: Tianjin University
Yunqi Liu: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences
Henning Sirringhaus: University of Cambridge
Lang Jiang: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The cornerstones of emerging high-performance organic photovoltaic devices are bulk heterojunctions, which usually contain both structure disorders and bicontinuous interpenetrating grain boundaries with interfacial defects. This feature complicates fundamental understanding of their working mechanism. Highly-ordered crystalline organic p–n heterojunctions with well-defined interface and tailored layer thickness, are highly desirable to understand the nature of organic heterojunctions. However, direct growth of such a crystalline organic p–n heterojunction remains a huge challenge. In this work, we report a design rationale to fabricate monolayer molecular crystals based p–n heterojunctions. In an organic field-effect transistor configuration, we achieved a well-balanced ambipolar charge transport, comparable to single component monolayer molecular crystals devices, demonstrating the high-quality interface in the heterojunctions. In an organic solar cell device based on the p–n junction, we show the device exhibits gate-tunable open-circuit voltage up to 1.04 V, a record-high value in organic single crystalline photovoltaics.

Date: 2021
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DOI: 10.1038/s41467-021-23066-3

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