An organic semiconductor with high carrier mobility and efficient light absorption over a wide spectral range is of the most important yet challenging material for constructing a broadband responsive organic photodetector.However,the development of such organic semiconductors,especially for air-stable n-type organic small molecule semiconductors,is still at an early stage.Here we report the fabrication of high-performance n-type semiconducting crystalline nanosheets and the development of air-stable field-effect transistors,phototransistors,with high response over a broad spectrum.The n-type small molecule semiconductor is assembled into a crystalline nanosheet based on the solvent-phase interfacial self-assembly method.N-type field-effect transistors with high electron mobility are fabricated and their electrical performances exhibit excellent air stability.Impressively,the demonstrated phototransistors exhibit an ultrahigh responsivity over a wide spectral range from 365 to 940 nm,with a maximum photoresponsivity of 9.2×105 AW-1 and specific detectivity of 5.26×1013 Jones,which is the best performance among the reported n-type organic small molecule-based phototransistors.

Ying-Shi Guan;Jing Qiao;Yingying Liang;Hari Krishna Bisoyi;Chao Wang;Wei Xu;Daoben Zhu;Quan Li

Institute of Advanced Materials and School of Chemistry and Chemical Engineering,Southeast University,211189 Nanjing,China;Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids Institute of Chemistry,Chinese Academy of Sciences,100190 Beijing,China;Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program,Kent State University,Kent,OH 44242,USA

光：科学与应用（英文版）

[1]Ying-Shi Guan;Jing Qiao;Yingying Liang;Hari Krishna Bisoyi;Chao Wang;Wei Xu;Daoben Zhu;Quan Li-.A high mobility air-stable n-type organic small molecule semiconductor with high UV-visible-to-NIR photoresponse)[J].光：科学与应用（英文版）,2022(09):2140-2146

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