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2011•Japanese Journal of Applied PhysicsRequires access

Photocurrent and Persistent Photoconductivity in Zinc Oxide Thin-Film Transistors under Ultraviolet-Light Irradiation

Mamoru Furuta, Y. Kamada, Mutsumi Kimura, Shin‐ichi Shimakawa, Toshiyuki Kawaharamura, Dapeng Wang, Chaoyang Li, Shizυo Fujita, Takashi Hirao

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Abstract

The photocurrent and photoconductive decay of the bottom-gate zinc oxide thin-film transistors (ZnO TFTs) under ultraviolet (UV) light irradiation were investigated. A light-shield was formed on the TFTs to generate photoexcited carriers in a limited portion of the channel. It was found that the UV-light irradiated portion in the channel influenced not only the photocurrent but also the photoconductive decay of the ZnO TFTs. On the basis of the experimental and device simulation results, it is safe to say that the positive charges accumulated near the source region play a key role in determining both the photocurrent and photoconductive decay of the ZnO TFTs.

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What this paper is about

The photocurrent and photoconductive decay of the bottom-gate zinc oxide thin-film transistors (ZnO TFTs) under ultraviolet (UV) light irradiation were investigated. A light-shield was formed on the TFTs to generate photoexcited carriers in a limited portion of the channel. It was found that the UV-light irradiated portion in the channel influenced not only the photocurrent but also the photoconductive decay of the ZnO TFTs. On the basis of the experimental and device simulation results, it is safe to say that the positive charges accumulated near the source region play a key role in determining both the photocurrent and photoconductive decay of the ZnO TFTs.

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Available abstract

The photocurrent and photoconductive decay of the bottom-gate zinc oxide thin-film transistors (ZnO TFTs) under ultraviolet (UV) light irradiation were investigated. A light-shield was formed on the TFTs to generate photoexcited carriers in a limited portion of the channel. It was found that the UV-light irradiated portion in the channel influenced not only the photocurrent but also the photoconductive decay of the ZnO TFTs. On the basis of the experimental and device simulation results, it is safe to say that the positive charges accumulated near the source region play a key role in determining both the photocurrent and photoconductive decay of the ZnO TFTs.

Key concepts: Photocurrent, Photoconductivity, Optoelectronics, Materials science, Ultraviolet, Irradiation, Thin-film transistor, Transistor

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