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Dual functional photo-response for p-Si/SiO 2 /n-InGaZnO graphene nanocomposites photodiodes.
Nanotechnology 2018 December 15
This study demonstrates dual functional hybrid heterojunction photodiodes (PDs) that comprise an amorphous indium gallium zinc oxide (a-IGZO) thin film blended with graphene nanoflakes and a SiO2 (5 nm)/Si substrate. The PDs exhibit a photo-responsivity of approximately 0.15-0.27 A W-1 under 633 nm illumination, which is much higher than that for a-IGZO based phototransistor in the visible region. The device also gives a long-lasting persistent photocurrent (PPC) when the UV light is extinguished. This results show that the hybrid heterojunction acts as a high performance photodetector for the detection of visible light and provides a universal scenario for development of PPC.
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