[논문]Instability in an amorphous In–Ga–Zn–O field effect transistor upon water exposure

Sharma, Bhupendra K; Ahn, Jong-Hyun

doi:10.1088/0022-3727/49/5/055102

Instability in an amorphous In–Ga–Zn–O field effect transistor upon water exposure

Journal of physics. D, applied physics, v.49 no.5, 2016년, pp.055102 -

Sharma, Bhupendra K (Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore-560012, India) , Ahn, Jong-Hyun (School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea)

Abstract ▼ AI-Helper

The instability of an amorphous indium–gallium–zinc oxide (IGZO) field effect transistor is investigated upon water treatment. Electrical characteristics are measured before, immediately after and a few days after water treatment in ambient as well as in vacuum conditions. It is observed that after a few days of water exposure an IGZO field effect transistor (FET) shows relatively more stable behaviour as compared to before exposure. Transfer characteristics are found to shift negatively after immediate water exposure and in vacuum. More interestingly, after water exposure the off current is found to decrease by 1–2 orders of magnitude and remains stable even after 15 d of water exposure in ambient as well as in vacuum, whereas the on current more or less remains the same. An x-ray photoelectron spectroscopic study is carried out to investigate the qualitative and quantitative analysis of IGZO upon water exposure. The changes in the FET parameters are evaluated and attributed to the formation of excess oxygen vacancies and changes in the electronic structure of the IGZO bulk channel and at the IGZO/SiO2 interface, which can further lead to the formation of subgap states. An attempt is made to distinguish which parameters of the FET are affected by the changes in the electronic structure of the IGZO bulk channel and at the IGZO/SiO2 interface separately.

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Instability in an amorphous In–Ga–Zn–O field effect transistor upon water exposure

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연합인증

Instability in an amorphous In–Ga–Zn–O field effect transistor upon water exposure

Abstract ▼ AI-Helper

참고문헌 (18)

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