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The density of states (DOS)-based DC I-V model of an amorphous gallium-indium-zinc oxide (a-GIZO) thin-film transistor (TFT) is proposed and demonstrated with self-consistent methodologies for extracting parameters. By combining the optical charge-pumping technique and the nonlinear relation between the surface potential (phiS) and gate voltage (V GS), it is verified that the proposed DC model reproduces well both the measured V GS-dependent mobility and the I DS-V GS characteristics. Finally, the extracted DOS parameters are N TA = 4.4 times 1017 cm-3 middot eV-1, N DA = 3 times 1015 cm-3 middot eV-1, kT TA = 0.023 eV, kT DGA = 1.5 eV, and EO = 1.8 eV, with the formulas of exponential tail states and Gaussian deep states.
Date of Publication: Oct. 2009