J. Semicond. > Volume 32 > Issue 7 > Article Number: 074004

Analytical drain current model for amorphous IGZO thin-film transistors in above-threshold regime

He Hongyu and Zheng Xueren

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Abstract: An analytical drain current model is presented for amorphous In–Ga–Zn–oxide thin-film transistors in the above-threshold regime, assuming an exponential trap states density within the bandgap. Using a charge sheet approximation, the trapped and free charge expressions are calculated, then the surface potential based drain current expression is developed. Moreover, threshold voltage based drain current expressions are presented using the Taylor expansion to the surface potential based drain current expression. The calculated results of the surface potential based and threshold voltage based drain current expressions are compared with experimental data and good agreements are achieved.

Key words: amorphous In–Ga–Zn–oxide (a-IGZO)thin-film transistors (TFTs)surface potentialthreshold voltagetrap states

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He H Y, Zheng X R. Analytical drain current model for amorphous IGZO thin-film transistors in above-threshold regime[J]. J. Semicond., 2011, 32(7): 074004. doi: 10.1088/1674-4926/32/7/074004.

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History

Manuscript received: 18 August 2015 Manuscript revised: 04 March 2011 Online: Published: 01 July 2011

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