High-Quality LaVO3 Films as Solar Energy Conversion Material

Hai Tian Zhang, Matthew Brahlek, Xiaoyu Ji, Shiming Lei, Jason Lapano, John W. Freeland, Venkatraman Gopalan, Roman Engel-Herbert

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Mott insulating oxides and their heterostructures have recently been identified as potential photovoltaic materials with favorable absorption properties and an intrinsic built-in electric field that can efficiently separate excited electron-hole pairs. At the same time, they are predicted to overcome the Shockley-Queisser limit due to strong electron-electron interaction present. Despite these premises a high concentration of defects commonly observed in Mott insulating films acting as recombination centers can derogate the photovoltaic conversion efficiency. With use of the self-regulated growth kinetics in hybrid molecular beam epitaxy, this obstacle can be overcome. High-quality, stoichiometric LaVO3 films were grown with defect densities of in-gap states up to 2 orders of magnitude lower compared to the films in the literature, and a factor of 3 lower than LaVO3 bulk single crystals. Photoconductivity measurements revealed a significant photoresponsivity increase as high as tenfold of stoichiometric LaVO3 films compared to their nonstoichiometric counterparts. This work marks a critical step toward the realization of high-performance Mott insulator solar cells beyond conventional semiconductors.

Original languageEnglish (US)
Pages (from-to)12556-12562
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number14
DOIs
StatePublished - Apr 12 2017

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Energy conversion
Solar energy
Electron-electron interactions
Defect density
Growth kinetics
Photoconductivity
Molecular beam epitaxy
Oxides
Conversion efficiency
Heterojunctions
Solar cells
Electric fields
Single crystals
Semiconductor materials
Defects
Electrons

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Zhang, Hai Tian ; Brahlek, Matthew ; Ji, Xiaoyu ; Lei, Shiming ; Lapano, Jason ; Freeland, John W. ; Gopalan, Venkatraman ; Engel-Herbert, Roman. / High-Quality LaVO3 Films as Solar Energy Conversion Material. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 14. pp. 12556-12562.
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High-Quality LaVO3 Films as Solar Energy Conversion Material. / Zhang, Hai Tian; Brahlek, Matthew; Ji, Xiaoyu; Lei, Shiming; Lapano, Jason; Freeland, John W.; Gopalan, Venkatraman; Engel-Herbert, Roman.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 14, 12.04.2017, p. 12556-12562.

Research output: Contribution to journalArticle

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Zhang HT, Brahlek M, Ji X, Lei S, Lapano J, Freeland JW et al. High-Quality LaVO3 Films as Solar Energy Conversion Material. ACS Applied Materials and Interfaces. 2017 Apr 12;9(14):12556-12562. https://doi.org/10.1021/acsami.6b16007