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STRUCTURAL, ELECTRONIC, AND OPTICAL PROPERTIES OF THE IN2O3(ZNO)(N) SYSTEM

Yan, YF; Walsh, A; Da Silva, JLF; Wei, SH; Al-Jassim, M; (2009) STRUCTURAL, ELECTRONIC, AND OPTICAL PROPERTIES OF THE IN2O3(ZNO)(N) SYSTEM. In: 2009 34TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, VOLS 1-3. (pp. 2234 - 2236). IEEE

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Abstract

We studied the structural, electronic, and optical properties of the In2O3(ZnO)(n) system by a combination of high-resolution electron microscopy, image simulation, and density-functional theory calculation. We found that the In2O3(ZnO)(n) system has a polytypoid structure that consists of wurtzite InZnnOn., slabs separated by single In-O octahedral layers. These octahedral layers are inversion domain boundaries and satisfy the electronic octet rule. The InZnnOn+1 slabs contain another type of boundary that inverts the polarities again. This boundary prefers a zigzag modulated structure and also obeys the electronic octet rule. We also found that the red-shift in optical transitions for the In2O3(ZnO)(n) system as compared to individual In2O3 and ZnO systems is because the symmetry-forbidden band-edge transitions in In2O3 are overcome by the formation of superlattices, with ZnO contributions to the top of the valence band. We further found that increasing n results in an enhanced valence-band maximum in the ZnO region, while the conduction-band minimum becomes more localized on the InO2 layers, which introduces confinement to electron carriers. Such enhanced localization explains why Zn-rich compounds (higher n) exhibit lower conductivity.

Type:Proceedings paper
Title:STRUCTURAL, ELECTRONIC, AND OPTICAL PROPERTIES OF THE IN2O3(ZNO)(N) SYSTEM
Event:34th IEEE Photovoltaic Specialists Conference
Location:Philadelphia, PA
Dates:2009-06-07 - 2009-06-12
ISBN-13:978-1-4244-2949-3
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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