Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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MoOx-Windowed High-Performing Transparent Photodetector

MoOx 기반의 고성능 투명 광검출기

  • Park, Wang-Hee (Photoelectric and Energy Device Application Lab, Multidisciplinary Core Institute for Future Energies, Incheon National University) ;
  • Lee, Gyeongnam (Photoelectric and Energy Device Application Lab, Multidisciplinary Core Institute for Future Energies, Incheon National University) ;
  • Kim, Joondong (Photoelectric and Energy Device Application Lab, Multidisciplinary Core Institute for Future Energies, Incheon National University)
  • 박왕희 (인천대학교 차세대 융합에너지 중점연구소 광전에너지소자연구실) ;
  • 이경남 (인천대학교 차세대 융합에너지 중점연구소 광전에너지소자연구실) ;
  • 김준동 (인천대학교 차세대 융합에너지 중점연구소 광전에너지소자연구실)
  • Received : 2017.02.22
  • Accepted : 2017.03.21
  • Published : 2017.06.01
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Abstract

A high-performing all-transparent photodetector was created by configuring a $MoO_x$/NiO/ZnO/ITO structure on a glass substrate. The ITO bottom layer was applied as a back contact. To achieve the transparent p/n junction, p-type NiO was coated on the n-type ZnO layer. Reactive sputtering was used to spontaneously form the ZnO or NiO layer. In order to improve the transparent photodetector performance, the functional $MoO_x$ window layer was used. Optically, the $MoO_x$ window provided a refractive index layer (n=1.39) lower than that of NiO (n=2), increasing the absorption of the incident light wavelengths (${\lambda}s$). Moreover, the $MoO_x$ window can provide a lower sheet resistance to improve the carrier collection for the photoresponses. The $MoO_x$/NiO/ZnO/ITO device showed significantly better photoresponses of 877.05 (at ${\lambda}$=460nm), 87.30 (${\lambda}$=520 nm), and 30.38 (${\lambda}$=620 nm), compared to 197.28 (${\lambda}$=460 nm), 51.74 (${\lambda}$=520 nm) and 25.30 (${\lambda}$=620 nm) of the NiO/ZnO/ITO device. We demonstrated the high-performing transparent photodetector by using the multifunctional $MoO_x$ window layer.

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