Enhanced Switchable Ferroelectric Photovoltaic Effects in Hexagonal Ferrite Thin Films via Strain Engineering
SCIE
SCOPUS
- Title
- Enhanced Switchable Ferroelectric Photovoltaic Effects in Hexagonal Ferrite Thin Films via Strain Engineering
- Authors
- Han, Hyeon; Kim, Donghoon; Chu, Kanghyun; Park, Jucheol; Nam, Sang Yeol; Heo Seungyang; Yang, Chan-Ho; JANG, HYUN MYUNG
- Date Issued
- 2018-01
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Ferroelectric photovoltaics (FPVs) are being extensively investigated by virtue of switchable photovoltaic responses and anomalously high photovoltages of ∼104 V. However, FPVs suffer from extremely low photocurrents due to their wide band gaps (Eg). Here, we present a promising FPV based on hexagonal YbFeO3 (h-YbFO) thin-film heterostructure by exploiting its narrow Eg. More importantly, we demonstrate enhanced FPV effects by suitably exploiting the substrate-induced film strain in these h-YbFO-based photovoltaics. A compressive-strained h-YbFO/Pt/MgO heterojunction device shows ∼3 times enhanced photovoltaic efficiency than that of a tensile-strained h-YbFO/Pt/Al2O3 device. We have shown that the enhanced photovoltaic efficiency mainly stems from the enhanced photon absorption over a wide range of the photon energy, coupled with the enhanced polarization under a compressive strain. Density functional theory studies indicate that the compressive strain reduces Eg substantially and enhances the strength of d–d transitions. This study will set a new standard for determining substrates toward thin-film photovoltaics and optoelectronic devices.
- Keywords
- Density functional theory; Energy gap; Ferrites; Ferroelectric films; Ferroelectricity; Heterojunctions; Iron compounds; Optoelectronic devices; Photons; Substrates; Thin films; Ytterbium compounds; Density functional theory studies; Enhanced polarization; Heterojunction devices; Hexagonal ferrite; Photo-voltaic efficiency; Photovoltaic response; Switchable; Thin film photovoltaics; Photovoltaic effects
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/40946
- DOI
- 10.1021/acsami.7b16700
- ISSN
- 1944-8244
- Article Type
- Article
- Citation
- ACS Applied Materials & Interfaces, vol. 10, no. 2, page. 1846 - 1853, 2018-01
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.