Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers

Abstract TiO2 is the most widely used material for the electron transport layers (ETLs) because it is characterized by proper band alignment with light absorbers, adequate optical transmittance, and high electron mobility. There are two thermodynamically stable crystal phases of TiO2: anatase and ru...

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Autores principales:	Yeon Soo Kim, Hye-Jin Jin, Hye Ri Jung, Jihyun Kim, Bich Phuong Nguyen, Juran Kim, William Jo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a18b9c2316624d4182a96e71e6c1da5e
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spelling	oai:doaj.org-article:a18b9c2316624d4182a96e71e6c1da5e2021-12-02T16:36:05ZReduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers10.1038/s41598-021-86422-92045-2322https://doaj.org/article/a18b9c2316624d4182a96e71e6c1da5e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86422-9https://doaj.org/toc/2045-2322Abstract TiO2 is the most widely used material for the electron transport layers (ETLs) because it is characterized by proper band alignment with light absorbers, adequate optical transmittance, and high electron mobility. There are two thermodynamically stable crystal phases of TiO2: anatase and rutile. However, understanding which phase is more effective as the ETL is still required. In this paper, we demonstrate the different effects of using epitaxial anatase TiO2 and epitaxial rutile TiO2 (both grown using pulsed laser deposition) as the ETL material on the electrical and optical properties. Epitaxial Nb-doped TiO2 layers were used as the common electrode material for the both epitaxial ETLs for which the crystalline structural analysis revealed high crystalline qualities and good coherency for both phases. By analyzing the recombination kinetics, the anatase phase shows a preferable performance in comparison with the rutile phase, although both epitaxial phases show remarkably reduced extrinsic recombination properties, such as trap-assisted recombination. This study demonstrates not only a better electron transporting performance of anatase phase but also reduced extrinsic recombination through epitaxy growth.Yeon Soo KimHye-Jin JinHye Ri JungJihyun KimBich Phuong NguyenJuran KimWilliam JoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yeon Soo Kim Hye-Jin Jin Hye Ri Jung Jihyun Kim Bich Phuong Nguyen Juran Kim William Jo Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers
description	Abstract TiO2 is the most widely used material for the electron transport layers (ETLs) because it is characterized by proper band alignment with light absorbers, adequate optical transmittance, and high electron mobility. There are two thermodynamically stable crystal phases of TiO2: anatase and rutile. However, understanding which phase is more effective as the ETL is still required. In this paper, we demonstrate the different effects of using epitaxial anatase TiO2 and epitaxial rutile TiO2 (both grown using pulsed laser deposition) as the ETL material on the electrical and optical properties. Epitaxial Nb-doped TiO2 layers were used as the common electrode material for the both epitaxial ETLs for which the crystalline structural analysis revealed high crystalline qualities and good coherency for both phases. By analyzing the recombination kinetics, the anatase phase shows a preferable performance in comparison with the rutile phase, although both epitaxial phases show remarkably reduced extrinsic recombination properties, such as trap-assisted recombination. This study demonstrates not only a better electron transporting performance of anatase phase but also reduced extrinsic recombination through epitaxy growth.
format	article
author	Yeon Soo Kim Hye-Jin Jin Hye Ri Jung Jihyun Kim Bich Phuong Nguyen Juran Kim William Jo
author_facet	Yeon Soo Kim Hye-Jin Jin Hye Ri Jung Jihyun Kim Bich Phuong Nguyen Juran Kim William Jo
author_sort	Yeon Soo Kim
title	Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers
title_short	Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers
title_full	Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers
title_fullStr	Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers
title_full_unstemmed	Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers
title_sort	reduced extrinsic recombination process in anatase and rutile tio2 epitaxial thin films for efficient electron transport layers
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a18b9c2316624d4182a96e71e6c1da5e
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_version_	1718383647849971712

Reduced extrinsic recombination process in anatase and rutile TiO2 epitaxial thin films for efficient electron transport layers

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