Photoelectromagnetic Effect in Hybrid Lead Iodide Perovskite

Raj, AA and Bhardwaj, S and Narasimhan, KL and Avasthi, S (2024) Photoelectromagnetic Effect in Hybrid Lead Iodide Perovskite. In: ACS Applied Electronic Materials .

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Abstract

This is the first report of the photoelectromagnetic (PEM) effect in single crystals and thin films of pure and mixed cation methylammonium lead iodide. A combination of photoconductance (PC) and PEM measurements has a unique capability to characterize bulk recombination unaffected by surface effects. We report lower limits to the bulk carrier lifetime, the carrier mobility, and the bulk diffusion length in methylammonium lead iodide (MAPbI3) and acetamidinium-substituted lead iodide (MA0.9AA0.1PbI3) perovskite single crystals and thin films. Data show that the oversized acetamidinium cation passivates the bulk, leading to a 10x longer bulk recombination lifetime. The ratio of PC to PEM signal allows a direct measurement of the bulk recombination velocity (BRV) that determines the open-circuit voltage in solar cells. Surprisingly, the BRVs of the MAPbI3 single crystal and polycrystalline thin film are comparable even though the lifetime changes by 2 orders of magnitude, explaining why the performance of single-crystal perovskite solar cells is not better than state-of-art thin-film perovskite solar cells. PEM measurement is a straightforward measurement tool that can measure and optimize the transport and recombination properties of solar cell materials. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Electronic Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Carrier lifetime; Iodine compounds; Layered semiconductors; Lead compounds; Open circuit voltage; Perovskite; Perovskite solar cells; Photoelectromagnetic effects; Positive ions; Thin films, Bulk lifetime; Bulk recombination; Halide perovskites; Lead halide perovskite; Mixed cations; Perovskite thin films; Photoconductance; Recombination velocity; Single-crystal films; Thin-films, Single crystals
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	09 Sep 2024 11:07
Last Modified:	09 Sep 2024 11:07
URI:	http://eprints.iisc.ac.in/id/eprint/85985

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