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Controlling crystal growth by chloride-assisted synthesis: Towards optimized charge transport in hybrid halide perovskites

Lookup NU author(s): Dr Pablo Docampo

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Abstract

Understanding the charge carrier dynamics and charge transport in metal halide perovskites and their correlation to the synthesis procedure is crucial for the fabrication of competitive thin film photovoltaic devices and their further improvement. In this work we investigate two CH3NH3PbI3 films both deposited by a two-step protocol and only differing in the optional addition of a chloride containing salt to the precursor solution. Although being highly akin from a chemical point of view, these films show substantial differences in their optoelectronic characteristics, such as enhanced charge carrier mobilities in the chloride-treated perovskite films. We furthermore observe different light-soaking behavior and increased photoluminescence lifetimes which we assign to the chloride addition during film deposition resulting in controlled crystal growth with fewer defects.

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Author(s): Grill I, Handloser K, Hanusch FC, Giesbrecht N, Bein T, Docampo P, Handloser M, Hartschuh A

Publication type: Article

Publication status: Published

Journal: Solar Energy Materials & Solar Cells

Year: 2017

Volume: 166

Pages: 269-275

Print publication date: 01/07/2017

Online publication date: 28/11/2016

Acceptance date: 18/11/2016

Date deposited: 04/09/2018

ISSN (print): 0927-0248

Publisher: Elsevier BV * North-Holland

URL: https://doi.org/10.1016/j.solmat.2016.11.021

DOI: 10.1016/j.solmat.2016.11.021

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