Universität zu Köln

Choi, Heechae, Kwon, Yongjung, Paik, Juwon ORCID: 0000-0002-2002-702X, Seol, Jae-Bok and Jeong, Young Kyu (2019). p-Type Conductivity of Hydrated Amorphous V2O5 and Its Enhanced Photocatalytic Performance in ZnO/V2O5/rGO. ACS Appl. Electron. Mater., 1 (9). S. 1881 - 1898. WASHINGTON: AMER CHEMICAL SOC. ISSN 2637-6113

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Abstract

Vanadium pentoxide (V2O5) is known to have natural n-type conductivity but transitions from n- to p-type conductivity when grown in a hydrated amorphous phase via atomic layer deposition. Compared with the intrinsic n-type character of V2O5, the hydrated amorphous V2O5 with artificial p-type conductivity has an increased work function difference, which can build stronger interface electric fields in ZnO/V2O5 heterojunction structures. This increased internal electric field strengthens the electron-hole separation across the heterojunction interface, which in turn improves the photocatalytic and photoelectrochemical performance of the structure. Using first-principles calculations, we found that when H2O molecules are incorporated into the amorphous V2O5 matrix, delocalized empty states are freshly formed above the valence band maximum in the hydrated amorphous V2O5, playing a crucial role in the transition of electrical conductivity within V2O5 This approach provides a simple and efficient way to discover new p-type materials and apply them to future p-n junction devices in terms of process simplicity and cost effectiveness.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Choi, Heechae UNSPECIFIED UNSPECIFIED UNSPECIFIED Kwon, Yongjung UNSPECIFIED UNSPECIFIED UNSPECIFIED Paik, Juwon UNSPECIFIED orcid.org/0000-0002-2002-702X UNSPECIFIED Seol, Jae-Bok UNSPECIFIED UNSPECIFIED UNSPECIFIED Jeong, Young Kyu UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-142007
DOI:	10.1021/acsaelm.9b00397
Journal or Publication Title:	ACS Appl. Electron. Mater.
Volume:	1
Number:	9
Page Range:	S. 1881 - 1898
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2637-6113
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GENERALIZED GRADIENT APPROXIMATION; TOTAL-ENERGY CALCULATIONS; CHARGE SEPARATION; OXIDE; NANOSTRUCTURES; EFFICIENCY; TRANSPORT; GRAPHENE; LAYER; ZNO Multiple languages Engineering, Electrical & Electronic; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14200