Physical Origins and Analysis of Negative-Bias Stress Instability Mechanism in Polymer-Based Thin-Film Transistors
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- Physical Origins and Analysis of Negative-Bias Stress Instability Mechanism in Polymer-Based Thin-Film Transistors
- Lee, Jaewook; Jang, Jaeman; Kim, Hyeongjung; Lee, Jiyoul; Lee, Bang-Lin; Choi, Sung-Jin; Kim, Dong Myong; Kim, Dae Hwan; Kim, Kyung Rok
- Negative-bias stress; instability; polymer; thin-film transistor; density-of-states; redistribution; threshold voltage; ON-current degradation; Schottky contact resistance
- Issue Date
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- IEEE ELECTRON DEVICE LETTERS, v.35, no.3, pp.396 - 398
- The physical origins of the negative-bias stress (NBS) instability in polymer-based thin-film transistors have been characterized. Through the quantitative analysis by TCAD simulation for the NBS time-dependent experimental results, the threshold voltage (V-T)-shift by sub-bandgap density-of-states redistribution forms 70% and 78% for the measured total V-T-shift while V-T-shift by gate oxide charge trapping only takes 30% and 22% at NBS time of 3000 and 7000 s, respectively. In addition, the increase of source/drain Schottky contact resistance (RSD) is the main reason for NBS-induced ON-current (ION) degradation.
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