期刊
CRYSTALS
卷 9, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/cryst9040192
关键词
transparent conducting oxides; oxygen defects; persistent photoconductivity; photo-sensors; optical synaptic devices
资金
- Samsung Electronics [201900610001]
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2018R1C1B6001688]
This paper provides a review of optical devices based on a wide band-gap transparent conducting oxide (TCO) while discussing related physical mechanisms and potential applications. Intentionally using a light-induced metastability mechanism of oxygen defects in TCOs, it is allowed to detect even visible lights, eluding to a persistent photoconductivity (PPC) as an optical memory action. So, this PPC phenomenon is naturally useful for TCO-based optical memory applications, e.g., optical synaptic transistors, as well as photo-sensors along with an electrical controllability of a recovery speed with gate pulse or bias. Besides the role of TCO channel layer in thin-film transistor structure, a defective gate insulator can be another approach for a memory operation with assistance for gate bias and illuminations. In this respect, TCOs can be promising materials for a low-cost transparent optoelectronic application.
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