Density of states of amorphous In-Ga-Zn-O from electrical and optical characterization

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[1] Yu, Eric Kai-Hsiang
[2] Jun, Sungwoo
[3] Kim, Dae Hwan
[4] Kanicki, Jerzy
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Kanicki, Jerzy | 1600年 / American Institute of Physics Inc.卷 / 116期
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We have developed a subgap density of states (DOS) model of amorphous In-Ga-Zn-O (a-IGZO) based on optical and electrical measurements. We study the optical absorption spectrum of the a-IGZO using UV-Vis spectroscopy. Together with the first-principles calculations and transient photoconductance spectroscopy from the literature; we determine that the valence band tail and deep-gap states are donors and can be described by exponential and Gaussian distributions; respectively. The conduction band tail and deep-gap states are examined using multi-frequency capacitance-voltage spectroscopy on a-IGZO thin-film transistors (TFTs). The extracted conduction band DOS are fitted to exponential (bandtail) and Gaussian (deep-gap) functions and their validity are supported by the activation energy vs. gate-source bias relationship of the a-IGZO TFT. The PL deep-level emission; which is almost identical to the conduction band deep-gap Gaussian; suggests that these states should be assigned as acceptors. The donor/acceptor assignments of subgap states are consistent with the 2D numerical TFT simulations. © 2014 AIP Publishing LLC;
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