Switchable photovoltaic response in hexagonal LuMnO3 single crystals
- 7 June 2021
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 118 (23), 232902
- https://doi.org/10.1063/5.0053379
Abstract
Hexagonal manganites, such as h-LuMnO3, are ferroelectric with its polar axis along the hexagonal axis and have a narrow electronic bandgap (≈1.5 eV). Using Pt electrodes, h-LuMnO3 single crystals display a strong rectification, characteristic of a Schottky diode, and a large photoresponse. It is found that the short circuit photocurrent density Jsc along the polar axis is modulated (up to 25%) by the direction of the ferroelectric polarization P, leading to a short circuit photocurrent loop that mimics the ferroelectric polarization. However, a non-switchable Jsc persists. Diffusion photocurrent is shown to dominate current-in-plane measurements and contributes to the non-switchable Jsc. This observation illustrates the dramatic role of the large optical absorption in hexagonal manganites. The accompanying optical dichroism might challenge disentangling a genuine bulk photovoltaic response in h-LuMnO3 single crystals, contributing to the non-switchable Jsc. Epitaxial thin films may offer a suitable alternative.Funding Information
- Generalitat de Catalunya (2017 SGR 1377)
- Fundación BBVA (2020 Leonardo Grant)
- China Scholarship Council (201806410010)
- Ministerio de Economía, Industria y Competitividad, Gobierno de España ("Severo Ochoa" Programme for Centres of Excellence: CEX2019-000917-S)
- Ministerio de Economía, Industria y Competitividad, Gobierno de España (MAT2017-85232-R (AEI/FEDER, EU))
- Ministerio de Economía, Industria y Competitividad, Gobierno de España (PID2019-107727RB-I00 (MINECO/FEDER, EU))
- Ministerio de Economía, Industria y Competitividad, Gobierno de España (Contrato RyC: RYC-2017-22531)
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