@article{3807620e4fc64b8c97519cd96a4a9911,
title = "Highly Sensitive Broadband Phototransistors Based on Gradient Tin/Lead Mixed Perovskites",
abstract = "Highly sensitive broadband photodetectors are critical to numerous cutting-edge technologies such as biomedical imaging, environment monitoring, and night vision. Here, phototransistors based on mixed Sn/Pb perovskites are reported, which demonstrate ultrahigh responsivity, gain and specific detectivity in a broadband from ultraviolet to near-infrared region. The interface properties of the perovskite phototransistors are optimized by a special three-step cleaning-healing-cleaning treatment, leading to a high hole mobility in the channel. The highly sensitive performance of the mixed Sn/Pb perovskite phototransistors can be attributed to the vertical compositional heterojunction automatically formed during the film deposition, which is helpful for the separation of photocarriers thereby enhancing a photogating effect in the perovskite channel. This work demonstrates a convenient approach to achieving high-performance phototransistors through tuning compositional gradient in mixed-metal perovskite channels.",
keywords = "broadband, detectivity, perovskites, phototransistors, responsivity",
author = "Loi, {Hok Leung} and Jiupeng Cao and Liu, {Chun Ki} and Yang Xu and Li, {Mitch Guijun} and Feng Yan",
note = "Funding Information: H.‐L.L. and J.C. contributed equally to this work. This work was financially supported by the Research Grants Council (RGC) of Hong Kong, China (Project No. 15210319), Innovation and Technology Commission of Hong Kong, China (Innovation and Technology Fund‐Guangdong‐Hong Kong Technology Cooperation Funding Scheme (ITF‐TCFS), Project No. GHP/042/19SZ), the Hong Kong Polytechnic University, Hong Kong, China (CD46). The work described in this paper was partially supported by the funding for Projects of Strategic Importance of the Hong Kong Polytechnic University (Project Code: 1‐ZE2X). This work was supported by the Research Institute for Sports Science and Technology (Project Code: CD6X). Funding Information: H.-L.L. and J.C. contributed equally to this work. This work was financially supported by the Research Grants Council (RGC) of Hong Kong, China (Project No. 15210319), Innovation and Technology Commission of Hong Kong, China (Innovation and Technology Fund-Guangdong-Hong Kong Technology Cooperation Funding Scheme (ITF-TCFS), Project No. GHP/042/19SZ), the Hong Kong Polytechnic University, Hong Kong, China (CD46). The work described in this paper was partially supported by the funding for Projects of Strategic Importance of the Hong Kong Polytechnic University (Project Code: 1-ZE2X). This work was supported by the Research Institute for Sports Science and Technology (Project Code: CD6X). Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",
year = "2022",
month = nov,
day = "21",
doi = "10.1002/smll.202205976",
language = "English",
volume = "19",
journal = "Small",
issn = "1613-6810",
publisher = "Wiley-VCH Verlag",
number = "3",
}