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Untwining polar contributions from light-polarization dependent photovoltaic response of LuMnO3-based ferroelectric capacitors
Untwining polar contributions from light-polarization dependent photovoltaic response of LuMnO3-based ferroelectric capacitors
- Publication Year :
- 2023
- Publisher :
- Elsevier, 2023.
-
Abstract
- Narrow bandgap ferroelectrics are receiving a renewed interest for photovoltaic applications aiming at exploiting new functionalities arising from bulk photovoltaic effect (BPE). We report on the photovoltaic response of vertical capacitors of ferroelectric hexagonal LuMnO3 films sandwiched between semitransparent top electrodes (Pt, Co, Ti) and a common bottom (Pt) bottom electrode. Our results show that the presence of electrodes, other than their optical transmittance, crucially determines the imprint in the ferroelectric layer and ultimately the sensitivity of short circuit current density (Jsc) to the ferroelectric polarization direction. The use of ultrathin (7 nm) Pt top electrodes allowed to obtain a large Jsc (up to 100 mA/cm2) and an open circuit voltage of Voc ≈ 0.52 V, with a responsivity of 2 × 10−3 A/W. Yet, polarization back-switching due to imprint largely washes out the dependence of Jsc on the direction of the polarization and thus, at first sight, Jsc seemingly appears to be ruled by conventional photovoltaic response. However, a pioneering analysis of the light-polarization dependent photosensitivity, allowed to disentangle for the first time, a genuine contribution of BPE from a ubiquitous Fresnel-like contribution arising from interfaced optical media.<br />Financial support from the Spanish Ministry of Science, Innovation and Universities, through the “Severo Ochoa” Programme for Centers of Excellence in R&D (FUNFUTURE CEX2019-000917-S), MAT2017-85232-R (AEI/FEDER, EU) and PID2019-107727RB-I00 (MINECO/FEDER, EU) projects, and from Generalitat de Catalunya (2017 SGR 1377) is acknowledged. I. F. acknowledges RyC Contract RYC-2017-22531. Project supported by a 2020 Leonardo Grant for Researchers and Cultural Creators, BBVA Foundation. ICTS-CNME at UCM is acknowledged for offering access to STEM microscopy and expertise. A. Q. acknowledges financial support from the Spanish Ministry of Science, Innovation and Universities through the Juan de la Cierva formación contract (FJC2019-039780-I). Y. S. and H. T. are financially supported by China Scholarship Council (CSC) with No. 201806410010 and No. 201906050014, respectively. The work of Y. S. and H. T. has been done as a part of their Ph.D. program in Materials Science at Universitat Autònoma de Barcelona.<br />With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S).
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....e61db6d52c7b8ed64896854e10a54836