CVD growth of perovskite/graphene films for high-performance flexible image sensor

Kailun Xia; Wenqiang Wu; Mengjia Zhu; Xinyi Shen; Zhe Yin; Haomin Wang; Shuo Li; Mingchao Zhang; Huimin Wang; Haojie Lu; Anlian Pan; Caofeng Pan; Yingying Zhang

doi:10.1016/j.scib.2019.12.015

CVD growth of perovskite/graphene films for high-performance flexible image sensor

Sci Bull (Beijing). 2020 Mar 15;65(5):343-349. doi: 10.1016/j.scib.2019.12.015. Epub 2019 Dec 16.

Authors

Kailun Xia¹, Wenqiang Wu², Mengjia Zhu¹, Xinyi Shen³, Zhe Yin¹, Haomin Wang¹, Shuo Li¹, Mingchao Zhang¹, Huimin Wang¹, Haojie Lu¹, Anlian Pan⁴, Caofeng Pan⁵, Yingying Zhang⁶

Affiliations

¹ Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
² CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China; Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
³ Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.
⁴ Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics and College of Materials Science and Engineering, Hunan University, Changsha 410082, China. Electronic address: anlian.pan@hnu.edu.cn.
⁵ CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China. Electronic address: cfpan@binn.cas.cn.
⁶ Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China. Electronic address: yingyingzhang@tsinghua.edu.cn.

PMID: 36659224
DOI: 10.1016/j.scib.2019.12.015

Abstract

Hybrid perovskite possesses excellent photoelectric properties, including large light-absorption capacity and high carrier mobility, and is an ideal light-absorbing material for photoelectric devices. The grain size and compactness of hybrid perovskite are key factors affecting the performance of photoelectric devices. The photocurrent and photoresponsivity of these devices are relatively low because of the rapidly recombined photoexcited electron-hole pairs in hybrid perovskite. Herein, we develop a facile two-step chemical vapor deposition (CVD) method to synthesize a high-quality van der Waals (vdWs) MAPbI₃/graphene heterostructure for high-performance image sensor. We introduced inorganic sources (PbI₂) to vdWs epitaxially grown PbI₂ film on a seamless graphene monolayer film template through CVD. Methylammonium iodide (MAI) was then reintroduced to prepare the vdWs MAPbI₃/graphene heterostructure. The MAPbI₃ layer is composed of densely packed, large-size grains and displays a smooth surface. High photoresponsivity of 10⁷ A/W is achieved in the corresponding photodetector. Inspired by the human visual system, we designed a flexible photodetector array containing (24 × 24) pixels, achieving perfect image recognition and color discrimination. Our study may greatly facilitate the construction of high-performance optoelectronic devices in artificial retina, biomedical imaging, remote sensing, and optical communication.

Keywords: Artificial retina; Chemical vapor deposition; Flexible photodetector array; Graphene template; Hybrid perovskite.