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Nanomaterials 2019, 9(2), 177; https://doi.org/10.3390/nano9020177

Defective States in Micro-Crystalline CsPbBr3 and Their Role on Photoconductivity

1
Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Via G. Sansone 1, Sesto Fiorentino, 50019 Firenze, Italy
2
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, Via G. Sansone 1, Sesto Fiorentino, 50019 Firenze, Italy
3
Dipartimento di Ingegneria Industriale, Università degli Studi di Firenze, Via S. Marta 3, 50139 Firenze, Italy
*
Author to whom correspondence should be addressed.
Received: 4 December 2018 / Revised: 19 January 2019 / Accepted: 22 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Nanomaterials for Dye-Sensitized Solar Cells)
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Abstract

Intrinsic defects in CsPbBr3 microcrystalline films have been studied using thermally stimulated current (TSC) technique in a wide temperature range (100–400 K). Below room temperature, TSC emission is composed by a set of several energy levels, in the range 0.11–0.27 eV, suggesting a quasi-continuum distribution of states with almost constant density. Above room temperature, up to 400 K, the temperature range of interest for solar cells, both dark current and photocurrent, are mainly dominated by energy levels in the range 0.40–0.45 eV. Even if measured trap densities are high, in the range 1013–1016 cm−3, the very small capture cross-sections, about 10−26 m2, agree with the high defect tolerance characterizing this material. View Full-Text
Keywords: CsPbBr3; microcrystals; defects; thermally stimulated current; charge transfer CsPbBr3; microcrystals; defects; thermally stimulated current; charge transfer
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Bruzzi, M.; Gabelloni, F.; Calisi, N.; Caporali, S.; Vinattieri, A. Defective States in Micro-Crystalline CsPbBr3 and Their Role on Photoconductivity. Nanomaterials 2019, 9, 177.

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