Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites

Overview

Journal Nat Photonics

Date 2015 Oct 7

PMID 26442125

Citations 25

Authors

Giulia Grancini

Ajay Ram Srimath Kandada

Jarvist M Frost

Alex J Barker

Michele De Bastiani

Marina Gandini

Sergio Marras

Guglielmo Lanzani

Aron Walsh

Annamaria Petrozza

Affiliations

Soon will be listed here.

Abstract

Solar cells based on hybrid inorganic-organic halide perovskites have demonstrated high power conversion efficiencies in a range of architectures. The existence and stability of bound electron-hole pairs in these materials, and their role in the exceptional performance of optoelectronic devices, remains a controversial issue. Here we demonstrate, through a combination of optical spectroscopy and multiscale modeling as a function of the degree of polycrystallinity and temperature, that the electron-hole interaction is sensitive to the microstructure of the material. The long-range order is disrupted by polycrystalline disorder and the variations in electrostatic potential found for smaller crystals suppress exciton formation, while larger crystals of the same composition demonstrate an unambiguous excitonic state. We conclude that fabrication procedures and morphology strongly influence perovskite behaviour, with both free carrier and excitonic regimes possible, with strong implications for optoelectronic devices.

Citing Articles

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