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

David A. Valverde-Chávez; Esteban Rojas-Gatjens; Jacob Williamson; Sarthak Jariwala; Yangwei Shi; Declan P. McCarthy; Stephen Barlow; Seth R. Marder; David S. Ginger; Carlos Silva-Acuña

doi:10.1039/D1TC01492G

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

David A. Valverde-Chávez,

‡^a Esteban Rojas-Gatjens,

‡^a Jacob Williamson,

^b Sarthak Jariwala,

^cd Yangwei Shi,^ce Declan P. McCarthy,^a Stephen Barlow,

^a Seth R. Marder,^af David S. Ginger^c and Carlos Silva-Acuña

*^abf

Author affiliations

* Corresponding authors

^a School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
E-mail: carlos.silva@gatech.edu

^b School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA

^c Department of Chemistry, University of Washington, Seattle, WA 98195, USA

^d Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA

^e Molecular Engineering & Sciences Institute, University of Washington, Seattle, WA 98195, USA

^f School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

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.

This article is part of the themed collections: 10th Anniversary: Dedicated Authors, Editor’s choice collection: luminescent metal halides and Journal of Materials Chemistry C HOT Papers

Journal of Materials Chemistry C

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

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

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