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Visualization of Carrier Transport in Lateral Metal-Perovskite-Metal Structures and its Influence on Device Operation

Ganesh, N and Ashar, AZ and Purohit, S and Narasimhan, KL and Narayan, KS (2022) Visualization of Carrier Transport in Lateral Metal-Perovskite-Metal Structures and its Influence on Device Operation. In: Physical Review Applied, 17 (2).

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Official URL: https://doi.org/10.1103/PhysRevApplied.17.024060


The high performance of hybrid perovskite-based devices is attributed to its excellent bulk transport properties. However, carrier dynamics, especially at the metal-perovskite interface, and their influence on device operation are not widely understood. This work presents the dominant transport mechanisms in methylammonium lead iodide (MAPbI3) perovskite-based asymmetric metal electrode lateral devices. The device operation is studied with interelectrode lengths varying from 4 µm to 120 µm. Device characteristics indicate distinct ohmic and space-charge-limited current regimes that are controlled by the interelectrode length and applied bias. The electric-potential mapping using Kelvin-probe microscopy across the device indicates minimal ion-screening effects and the presence of a transport barrier at the metal-MAPbI3 junction. Furthermore, photocurrent imaging of the channel using near-field excitation-scanning microscopy reveals dominant recombination and charge-separation zones. These lateral devices exhibit photodetector characteristics with a responsivity of about 51 mA/W in self-powered mode and 5.2 A/W at 5 V bias in short-channel devices (4 µm). The low device capacitance enables a fast light-switching response of approximately 12 ns. © 2022 American Physical Society.

Item Type: Journal Article
Publication: Physical Review Applied
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to authors
Keywords: Electric potential; Iodine compounds; Layered semiconductors; Lead compounds; Metals, Bulk transport; Carrier dynamics; Carriers transport; Device operations; Interelectrodes; Lateral device; Metal electrodes; Metal structures; Performance; Transport mechanism, Perovskite
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 12 May 2022 06:12
Last Modified: 12 May 2022 06:12
URI: https://eprints.iisc.ac.in/id/eprint/71631

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