A near-infrared photoinverter based on ZnO and quantum-dots
- A near-infrared photoinverter based on ZnO and quantum-dots
- 차순규; Byung Jun Kim; Sungho Park; Seong Jun Kang; 한일기
- photoinverter; near-infrared; ZnOquantum dots
- Issue Date
- RSC advances
- VOL 8, NO 41-23425
- Near-infrared (NIR) photoswitching transistors have been fabricated using a hybrid structure of zinc oxide (ZnO) and quantum-dots (QDs). The ZnO active layer was prepared using a solution process, while colloidal QDs were inserted between a silicon dioxide (SiO2) gate insulator and a ZnO active layer. The small band gap QDs (1.59 eV) were used to absorb low-energy NIR photons, generate photo-excited carriers, and inject them into the conduction band of the ZnO film. The device with the interfacial QDs induced photocurrents upon exposure to 780 nm-wavelength light. The photoresponsivity of the ZnO/QD device was 0.06 mA W-1, while that of the device without QDs was 1.7 x 10(-5) mA W-1, which indicated that the small band gap QDs enabled a photo-induced current when exposed to NIR light. Furthermore, a photoinverter was prepared which was composed of a ZnO/QDs phototransistor and a load resistor. Photoswitching characteristics indicated that the photoinverter was well modulated by a periodic light signal of 780 nm in wavelength. The results demonstrate a useful way to fabricate NIR optoelectronics based on ZnO and QDs.
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