Journal ArticleDOI
Bipolar doping and band-gap anomalies in delafossite transparent conductive oxides.
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TLDR
It is shown that both properties are results of a large disparity between the fundamental gap and the apparent optical gap, a finding that could lead to a breakthrough in the study of bipolarly dopable wide-gap semiconductor oxides.Abstract:
Doping wide-gap materials p type is highly desirable but often difficult. This makes the recent discovery of p-type delafossite oxides, CuM(III)O2, very attractive. The CuM(III)O2 also show unique and unexplained physical properties: Increasing band gap from M(III) = Al,Ga, to In, not seen in conventional semiconductors. The largest gap CuInO2 can be mysteriously doped both n and p type but not the smaller gaps CuAlO2 and CuGaO2. Here, we show that both properties are results of a large disparity between the fundamental gap and the apparent optical gap, a finding that could lead to a breakthrough in the study of bipolarly dopable wide-gap semiconductor oxides.read more
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Journal ArticleDOI
Effect of annealing temperature on structural, optoelectronic properties and interband transitions of CuCrO2 nanocrystalline films prepared by the sol–gel method
TL;DR: In this paper, a three-phase layered structure (air/film/substrate) was applied to simulate the transmittance spectra of CuCrO 2 films and three electronic transitions can be uniquely assigned and it was found that the direct transitions are the dominant effect for the optical properties.
Journal ArticleDOI
Stoichiometry Controlled Bipolar Conductivity in Nanocrystalline Ni x Cd 1 − x O 1 + δ Thin Films
Chao Ping Liu,Chao Ping Liu,Kingsley O. Egbo,Chun Yuen Ho,Juan Antonio Zapien,Wladek Walukiewicz,Kin Man Yu +6 more
TL;DR: In this article, the availability of wideband-gap oxides with bipolar conductivity is critical to developing transparent optoelectronic technologies, and the results strongly suggest that these alloys have great technological potential for applications requiring transparent conducting oxides.
Journal ArticleDOI
First-principles study of Sn and Ca doping in Cu In O 2
TL;DR: In this article, the roles of Ca and Sn doping for $p$-and $n$-type DFT calculations were studied from first principles DFT calculation, which may lead to a better understanding of the dopant effects and further help to speed up the progress of new doping techniques.
Journal ArticleDOI
A comparative study of the electronic structures of SrCu2O2 and PbCu2O2 by density functional theory, high resolution X-ray photoemission and electron paramagnetic resonance spectroscopy
Kate G. Godinho,Graeme W. Watson,Aron Walsh,Aron Walsh,A. J. H. Green,David J. Payne,Jeffrey Harmer,Russell G. Egdell +7 more
TL;DR: In this paper, the electronic structures of SrCu2O2 and PbCu 2O2 have been studied by density functional theory calculations in conjunction with high resolution X-ray photoemission spectroscopy (XPS) and electron paramagnetic resonance spectrograph (EPR).