Extraction of Propagation Delay-Correlated Mobility and Its Verification for Amorphous InGaZnO Thin-Film Transistor-Based Inverters

Author

Kyung Min Lee ; Jaeman Jang ; Sung-Jin Choi ; Dong Myong Kim ; Kyung Rok Kim ; Dae Hwan Kim

Author_Institution

Sch. of Electr. Eng., Kookmin Univ., Seoul, South Korea

Volume

62

Issue

5

fYear

2015

fDate

May-15

Firstpage

1504

Lastpage

1510

Abstract

We found that field-effect mobility, which had been widely used in the evaluation of the mobility of an amorphous indium-gallium-zinc oxide (a-IGZO) thin-film transistor (TFT) failed to describe the effect of mobility on propagation delay (tPD) in an a-IGZO TFT-based circuit, and also proposed an extraction technique for the tPD-correlated mobility (μ_tPD) considering both the subgap density-of-states and the voltage-dependent charge density. It is verified that the proposed μ_tPD is the best correlated with the measured tPD in IGZO TFT-based inverters other than various mobilities in the literature. Our results have revealed that it is possible to predict tPD only with the measured current-voltage characteristic of the a-IGZO TFT without measuring tPD in IGZO-based circuits.

Keywords

carrier mobility; gallium compounds; indium compounds; invertors; thin film transistors; zinc compounds; InGaZnO; a-IGZO TFT-based circuit; amorphous thin-film transistor-based inverter; current-voltage characteristic; extraction technique; field-effect mobility; propagation delay-correlated mobility extraction; voltage-dependent charge density; Current measurement; Inverters; Iron; Logic gates; Semiconductor device measurement; Thin film transistors; Voltage measurement; Amorphous indium-gallium-zinc oxide (a-IGZO); Amorphous indium???gallium???zinc oxide (a-IGZO); mobility; propagation delay; subgap density-of-states (DOSs); thin-film transistors (TFTs); thin-film transistors (TFTs).;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2015.2413941

Filename

7067392