High-performance violet phosphorus photodetectors with van der Waals-assisted contacts  

作　　者：Hao Wang Shuling Liu Peng Wang Haonan Ge Yue Chen Hailu Wang Tengfei Xu Jiaxiang Guo Yuanchen Zou Wenrui Wei Ruiqi Jiang Fang Wang Piotr Martyniuk Jinshui Miao Weida Hu 

机构地区：[1]State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China [2]School of Physics and Photoelectric Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China [3]Institute of Applied Physics,Military University of Technology,Warsaw 00-908,Poland [4]Frontier Institute of Chip and System,Fudan University,Shanghai 200438,China [5]School of Microelectronics,Shanghai University,Shanghai 201800,China [6]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第9期86-93,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 62261136552, 62005303, and 62134001);the National Key Research and Development Program of China (Grant No. 2021YFA0715602);the International Partnership Program of Chinese Academy of Sciences (Grant No. 181331KYSB20200012);the Shanghai Science and Technology Committee (Grant No. 23YF1455400);the Open Research Projects of Zhejiang Lab (Grant No. 2022NK0AB01)。

摘　　要：Black phosphorus(BP) as a narrow-bandgap two-dimensional semiconductor material has been extensively studied. And the allotrope violet phosphorus(VP) exhibits wide bandgap properties extending the application in the visible light band. However,due to the Schottky barrier of metal/semiconductor contacts(M/S), further device application of VP is limited. Here, VP-based photodetectors with van der Waals-assisted contact were demonstrated, achieving quasi-Ohmic M/S contacts. The output characteristics in dark conditions show ultralow current at the pA level. And the device exhibits a high current on-off ratio of 10~5and a fast response speed of 8.4 ms. Furthermore, we constructed the first allotropic photodetector based on BP and VP heterojunction. The device maintains ultralow dark current(~ pA) while exhibiting faster carrier transport, with 945 μs response time and polarization detection capability. These results offer an effective way to study the optoelectronic properties of VP and promote the study of allotropic heterojunction devices.

关 键 词：violet phosphorus two-dimensional materials PHOTODETECTORS Ohmic contact allotropic heterojunction 

分 类 号：TN36[电子电信—物理电子学]