Solution‐Processed Monolithic CH3NH3PbI3/PbI2 Vertical Heterostructure for High‐Performance Flexible and Broadband Photodetector

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....

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Bibliographic Details
Published in:Advanced optical materials 2021-09, Vol.9 (17), p.n/a
Main Authors: Xiao, Han, Liang, Tao, Xu, Jing, Xu, Mingsheng
Format: Article
Language:English
Subjects:
2D heterostructures
Broadband
broadband photodetection
flexible devices
Heterostructures
Materials science
Optics
Optoelectronics
Perovskites
Photometers
Room temperature
solution method
Spectral sensitivity
Two dimensional materials
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Summary: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 CH3NH3PbI3/PbI2 vertical heterostructure is synthesized via a facile two‐step solution method at room temperature, and flexible photodetectors based on the CH3NH3PbI3/PbI2 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 ≈103, a high detectivity up to 1.66 × 1012 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. Monolithic 2D CH3NH3PbI3/PbI2 vertical heterostructure is realized by a facile two‐step solution method at room temperature. Optimized structure endows superior performance to the photodetectors, including a current on/off ratio of ≈103, a responsivity of 4.79 A W−1, a high detectivity up to 1.66 × 1012 Jones, and a response speed of 16 ms.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202100664