Graphene‐Assisted Growth of Patterned Perovskite Films for Sensitive Light Detector and Optical Image Sensor Application

Controlled growth of high‐quality patterned perovskite films on a large scale is essentially required for the application of this class of materials in functional integrated devices and systems. Herein, graphene‐assisted hydrophilic–hydrophobic surface‐induced growth of Cs‐doped FAPbI3 perovskite fi...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2019-05, Vol.15 (19), p.e1900730-n/a
Main Authors: Wu, Chun‐Yan, Wang, Zhenyu, Liang, Lin, Gui, Tijun, Zhong, Wei, Du, Rui‐Chao, Xie, Chao, Wang, Li, Luo, Lin‐Bao
Format: Article
Language:English
Subjects:
Graphene
graphene assisted
hydrophilic–hydrophobic surface
Nanotechnology
optical image sensor
patterned growth
perovskite film
Perovskites
Photometers
Pixels
Sensor arrays
Spatial resolution
Stability
Substrates
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Summary:Controlled growth of high‐quality patterned perovskite films on a large scale is essentially required for the application of this class of materials in functional integrated devices and systems. Herein, graphene‐assisted hydrophilic–hydrophobic surface‐induced growth of Cs‐doped FAPbI3 perovskite films with well‐patterned shapes by a one‐step spin‐coating process is developed. Such a facile fabrication technique is compatible with a range of spin‐coated perovskite materials, perovskite manufacturing processes, and substrates. By employing this growing method, controllable perovskite photodetector arrays are realized, which have not only prominent photoresponse properties with a responsivity and specific detectivity of 4.8 AW−1 and 4.2 × 1012 Jones, respectively, but also relatively small pixel‐to‐pixel variation. Moreover, the photodetectors array can function as an effective visible light image sensor with a decent spatial resolution. Holding the above merits, the proposed technique provides a convenient and effective pathway for large‐scale preparation of patterned perovskite films for multifunctional application purposes. This study provides a method of graphene‐assisted growth of patterned perovskite films. The perovskite thin film fabricated by this method has high film‐forming quality revealed by the morphology and electrical analysis. Further study shows that the patterned perovskite films also have a good application in the image sensing field.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201900730