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In-gap states of an amorphous In-Ga-Zn-O thin film studied via high-sensitivity ultraviolet photoemission spectroscopy using low-energy photons

Nakazawa, R; Matsuzaki, A; Shimizu, K; Kawashima, E; Abdi-Jalebi, M; Stranks, SD; Tanaka, Y; ... Ishii, H; + view all (2021) In-gap states of an amorphous In-Ga-Zn-O thin film studied via high-sensitivity ultraviolet photoemission spectroscopy using low-energy photons. Applied Physics Express , 14 (7) , Article 071004. 10.35848/1882-0786/ac06ae. Green open access

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Abstract

Low-density electronic states in the energy gap of an amorphous In–Ga–Zn–O film control device performance. Herein, density of states (DOS) distribution from valence band to the in-gap states of 1014 cm−3 eV−1 level was determined using high-sensitivity UV photoemission spectroscopy. Exponential tail states accompanying two energetically-localized states were directly observed as reported previously. The observed slope of the exponential tail state was different from the Urbach energy derived using photothermal deflection spectroscopy, indicating the importance of directly observing the DOS of in-gap states.

Type: Article
Title: In-gap states of an amorphous In-Ga-Zn-O thin film studied via high-sensitivity ultraviolet photoemission spectroscopy using low-energy photons
Open access status: An open access version is available from UCL Discovery
DOI: 10.35848/1882-0786/ac06ae
Publisher version: http://dx.doi.org/10.35848/1882-0786/ac06ae
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: ultraviolet photoemission spectroscopy, UPS, HS-UPS, gap states, in-gap states, amorphous In-Ga-Zn-O, a-IGZO, OXIDE SEMICONDUCTOR A-INGAZNO4-X, ELECTRONIC-STRUCTURE, EXTRACTION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10129984
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