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http://dx.doi.org/10.4313/JKEM.2017.30.6.339

AZO-Embedded Transparent Cu Oxide Photodetector  

Lee, Gyeong-Nam (Department of Electrical Engineering, Incheon National University)
Park, Wang-Hee (Department of Electrical Engineering, Incheon National University)
Um, Sung-Yun (Department of Electrical Engineering, Incheon National University)
Jang, Jun-min (Department of Electrical Engineering, Incheon National University)
Lim, Sol-Ma-Ru (Department of Electrical Engineering, Incheon National University)
Yun, Hyun-Chan (Department of Electrical Engineering, Incheon National University)
Hyeon, Seong-Woo (Department of Electrical Engineering, Incheon National University)
Kim, Joondong (Department of Electrical Engineering, Incheon National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.30, no.6, 2017 , pp. 339-344 More about this Journal
Abstract
An all-transparent photodetector was fabricated by structuring $Cu_2O$/ZnO/AZO/ITO on a glass substrate. The visible-range transmittance was as high as 80%, which ensures clear vision forhuman eyes. High-transparency metal conductive oxides (p-type $Cu_2O$ and n-type ZnO) were appliedto form the transparent p/n junction. The functional AZO layer was adopted to improve the transparent photodetector performance between the ZnO and ITO, improving the photoresponses because of its electrical conductivity. To clarify the AZO functionality, a comparator device was prepared without the AZO layer in the formation of $Cu_2O$/ZnO/ITO/Glass. The $Cu_2O$/ZnO/AZO/ITO device provided a rectifying ratio of 113.46, significantly better than the 9.44 of the $Cu_2O$/ZnO/ITO device. In addition, the $Cu_2O$/ZnO/AZO/ITO device's photoresponses at short wavelengths were better than those of the comparator. The functioning AZO layer provides ahigh-performing transparent Cu oxide photodetector and may suggest a route for the design of efficient photoelectric devices.
Keywords
Cu oxide; Photodetector; Photoresponse; p-$Cu_2O$; n-ZnO; AZO;
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