材料科学
原子层沉积
压力(语言学)
阈值电压
光电子学
晶体管
图层(电子)
偏压
分析化学(期刊)
纳米技术
电压
电气工程
化学
语言学
哲学
工程类
色谱法
作者
Shin-Ho Noh,Hyo-Eun Kim,Young Ha Kwon,Nak‐Jin Seong,Kyu-Jeong Choi,Chi‐Sun Hwang,Geonhui Han,Si Jin Sung,Goo-Eun Jung,Sung‐Min Yoon
出处
期刊:ACS applied electronic materials
[American Chemical Society]
日期:2023-11-21
卷期号:5 (12): 6668-6676
被引量:1
标识
DOI:10.1021/acsaelm.3c01185
摘要
Vertical-channel thin-film transistors (VTFTs), featured to uniquely employ the In–Ga–Sn–O (IGTO)-active channel layers prepared by atomic layer deposition, were fabricated with a channel length (Lch) as short as 150 nm and characterized in terms of the short-channel effect (SCE) and operational reliability. All the fabricated devices exhibited sound and stable operations, including durability against SCEs, such as negligible DIBL effects, even for the nanoscale regime in Lch. The IGTO VTFT fabricated with a channel cationic composition (In/Ga/Sn) of 3.8:3.9:1.0 was examined to exhibit excellent device characteristics such as a current drivability (CDR) of 32.2 μA/μm and an on/off current ratio as high as 108. The threshold voltage shift (ΔVTH) representing the positive bias-stress (PBS) stability was secured as low as +0.87 V at a bias stress field of 2 MV/cm for 10,000 s. The ΔVTH values of the IGTO VTFTs were noticeably found to decrease with increasing In compositions in the IGTO channels, showing more robust PBS stability. Feasible scenario for the improvement in the PBS instability for the IGTO VTFT was elucidated by analysis on the correlations between the bulk-trap density and the cationic composition in the ALD IGTO channel. The composition-dependent PBS instabilities were also suggested to be markedly influenced by the magnitude of the bias-stress field owing to the generation of Sn–O weak bonds in the IGTO channel and donation of free carriers during PBS. These obtained insights could provide a beneficial design scheme for improving the PBS instability determined by the structural disadvantages, leading to balancing CDR with the bias-stress stability of the VTFTs, even when Lch was vertically scaled down to 150 nm.
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