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Solution‐Processed Monolithic CH 3 NH 3 PbI 3 /PbI 2 Vertical Heterostructure for High‐Performance Flexible and Broadband Photodetector
Author(s) -
Xiao Han,
Liang Tao,
Xu Jing,
Xu Mingsheng
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202100664
Subject(s) - photodetector , materials science , photodetection , heterojunction , responsivity , optoelectronics , specific detectivity , semiconductor , photonics , perovskite (structure) , optics , physics , chemical engineering , engineering
2D semiconductors are attracting increasing interest owing to their promising applications in high‐performance photodetection. However, the spectral response window is dictated by their intrinsic bandgaps, which is typically narrow and severely hinders their applications as broadband photodetectors. Herein, taking advantage of the outstanding optoelectronic properties of perovskite and 2D materials, a monolithic 2D CH 3 NH 3 PbI 3 /PbI 2 vertical heterostructure is synthesized via a facile two‐step solution method at room temperature, and flexible photodetectors based on the CH 3 NH 3 PbI 3 /PbI 2 heterostructures are constructed. The photodetectors with excellent flexibility and stability exhibit light response under various laser wavelengths from 375 to 1342 nm. In particular, the photodetector shows a current on/off ratio of ≈10 3 , a high detectivity up to 1.66 × 10 12 Jones, a responsivity of 4.79 A W −1 , and a response speed of 16 ms under 375 nm illumination. This work provides a facile route to 2D vertical semiconducting heterostructures, which is promising for application in high‐performance integrated optoelectronics.