A low-temperature photoresist-based film-profile engineering scheme for fabricating bottom- and double-gated indium-gallium-zinc oxide TFTs

Ping Che Liu, Po Jung Lin, Yu Chi Chen, Chien Wei Chen, Chi Chung Kei, Pei Wen Li, Horng Chih Lin*

*此作品的通信作者

研究成果: Article同行評審

摘要

We proposed a novel low-temperature (<110 °C) process scheme based on the film-profile engineering technique for fabricating indium-gallium-zinc oxide thin-film transistors (TFTs) with both bottom-gated (BG) and double-gated (DG) configurations. An organic photoresist (PR) suspended bridge is constructed to shadow the depositing species during the deposition processes of the bottom gate-oxide, channel, and source/drain metal films. An Al2O3 layer deposited at 110 °C using atomic-layer deposition is employed as the bottom gate-oxide layer. Such a low-temperature process allows us to deposit the Al2O3 layer following the formation of the PR suspended bridge, preventing the formation of organic residues between the gate-oxide and channel layers. As a result, excellent device performance in terms of field-effect mobility of 12.1 cm2 V−1 s−1 and subthreshold swing of 141 mV/dec is achieved. Our proposed low-temperature process scheme is readily applicable for fabricating DG TFTs which show substantial enhancements in driving currents.

原文English
文章編號03SP18
期刊Japanese journal of applied physics
63
發行號3
DOIs
出版狀態Published - 1 3月 2024

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