Issue 43, 2019

Vacuum-filtration enabled large-area CsPbBr3 films on porous substrates for flexible photodetectors

Abstract

All-inorganic perovskites (CsPbX3, X = Br, Cl, I) have been considered as promising candidates for developing high-performance, flexible and lightweight optoelectronic devices due to their high absorption coefficient, mechanical durability, low-temperature synthesis ability and stable physiochemical properties. However, the fabrication of pinhole-free, large-scale inorganic perovskite films is still a great challenge, because it is limited by strong chemical bonds and really low solubility, impeding their application in flexible solar cells, photodetectors and light emitting diodes. In this paper, a vacuum-filtration method to deposit large-scale, compact all-inorganic perovskite films from nanosheet suspensions on arbitrary porous substrates, which allows control of the uniformity and thickness of the perovskite films, is reported. The performance of the fabricated flexible-photodetectors was greatly improved by adding a proper amount of carbon nanotube (CNT) additive, which could maintain the low dark current density and increase the photo-responsivity by suppressing the photocarrier recombination. The improved photodetectors showed a large on/off ratio of >1 × 104, and a fast rise/decay time of 52/14 ms. These flexible photodetectors demonstrated excellent mechanical bending capabilities with retained performance after 1000 bending cycles. This deposition method could provide a universal route for preparing inorganic material films for fundamental studies and practical applications.

Graphical abstract: Vacuum-filtration enabled large-area CsPbBr3 films on porous substrates for flexible photodetectors

Supplementary files

Article information

Article type
Communication
Submitted
24 jul. 2019
Accepted
11 oct. 2019
First published
11 oct. 2019

J. Mater. Chem. C, 2019,7, 13402-13409

Vacuum-filtration enabled large-area CsPbBr3 films on porous substrates for flexible photodetectors

Q. Tan, G. Ye, Y. Zhang, X. Du, H. Liu, L. Xie, Y. Zhou and N. Liu, J. Mater. Chem. C, 2019, 7, 13402 DOI: 10.1039/C9TC04032C

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