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

Abstract

All-inorganic perovskites (CsPbX3, X = Cl, Br, I) have been considered as the promising candidates for developing high-performance flexible and lightweight optoelectronic devices due to the high absorption coefficient, mechanical durability, low-temperature synthesis ability and stable physiochemical property. However, limited by strong chemical bonds and really low solubility, the fabrication of pinhole-free large-scale inorganic perovskites films is still a great challenge, which impede its application in the flexible solar cell, photodetectors and light emitting diodes. Here, we report a vacuum-filtration method to deposit large-scale compact all-inorganic perovskite films from its nanosheets suspension on the arbitrary porous substrates, which allows control the uniformity and thickness of the perovskite films. The performance of fabricated flexible-photodetectors was highly improved by adding the proper amount of CNTs additives, 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 x 104, a fast rise/decay time of 52/14 ms. Our flexible photodetectors demonstrated excellent mechanical bending capability with retained performance after bending 1000 cycles. Our deposition method could provide a universal route for inorganic materials for fundamental studies and practical applications.

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Publication details

The article was received on 24 Jul 2019, accepted on 11 Oct 2019 and first published on 11 Oct 2019


Article type: Communication
DOI: 10.1039/C9TC04032C
J. Mater. Chem. C, 2019, Accepted Manuscript

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

    Q. Tan, Y. Guo, Y. Zhang, X. Du, H. Liu, L. Xie, Y. Zhou and N. Liu, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC04032C

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