Issue 26, 2021

Nonlinear photocarrier dynamics and the role of shallow traps in mixed-halide mixed-cation hybrid perovskites

Abstract

We examine the role of surface passivation on carrier trapping and nonlinear recombination dynamics in hybrid metal-halide perovskites by means of excitation correlation photoluminescence (ECPL) spectroscopy. We find that carrier trapping occurs on sub-nanosecond timescales in both control (unpassivated) and passivated samples, which is consistent within a shallow-trap model. However, the impact of passivation has a direct effect on both shallow and deep traps. Our results reveal that the effect of passivation of deep traps is responsible for the increase of the carrier lifetimes, while the passivation of shallow traps reduces the excitation density required for shallow-trap saturation. Our work demonstrates how ECPL provides details about the passivation of shallow traps beyond those available via conventional time-resolved photoluminescence techniques.

Graphical abstract: Nonlinear photocarrier dynamics and the role of shallow traps in mixed-halide mixed-cation hybrid perovskites

Supplementary files

Article information

Article type
Paper
Submitted
31 mar 2021
Accepted
27 may 2021
First published
02 iyn 2021

J. Mater. Chem. C, 2021,9, 8204-8212

Author version available

Nonlinear photocarrier dynamics and the role of shallow traps in mixed-halide mixed-cation hybrid perovskites

D. A. Valverde-Chávez, E. Rojas-Gatjens, J. Williamson, S. Jariwala, Y. Shi, D. P. McCarthy, S. Barlow, S. R. Marder, D. S. Ginger and C. Silva-Acuña, J. Mater. Chem. C, 2021, 9, 8204 DOI: 10.1039/D1TC01492G

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