Analysis of optical band-gap shift in impurity doped ZnO thin films by using nonparabolic conduction band parameters

Title
Analysis of optical band-gap shift in impurity doped ZnO thin films by using nonparabolic conduction band parameters
Authors
김원목김진수정증현박종극백영준성태연
Keywords
ZnO thin film; Optical band-gap; Nonparabolicity
Issue Date
2013-03
Publisher
Thin solid films
Citation
VOL 531, 430-435
Abstract
Polycrystalline ZnO thin films both undoped and dopedwith various types of impurities,which covered thewide carrier concentration range of 1016–1021 cm−3, were prepared bymagnetron sputtering, and their optical-band gaps were investigated. The experimentally measured optical band-gap shifts were analyzed by taking into account the carrier density dependent effectivemass determined by the first-order nonparabolicity approximation. It was shown that the measured shifts in optical band-gaps in ZnO films doped with cationic dopants, which mainly perturb the conduction band, could be well represented by theoretical estimation in which the band-gap widening due to the band-filling effect and the band-gap renormalization due to the many-body effect derived for a weakly interacting electron-gas model were combined and the carrier density dependent effective mass was incorporated.
URI
http://pubs.kist.re.kr/handle/201004/44575
ISSN
00406090
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KIST Publication > Article
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