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Updated: May 30, 2025

Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors
Published on: June 23, 2018
A photodetector for red and green with balanced negative and positive photocurrent for imaging is realized
Xuan Pu1, Rongli Deng1, Guanzhao Yang1
1Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, People's Republic of China.
Abstract:
A dual-polarity, photovoltaic photodetector for red-green dual-wavelength detection is demonstrated, operating in the self-powered mode. It is based on a core-shell n-InGaN nanowire/p-Cu2O heterostructure with inner upward energy band bending and near surface downward energy band bending. This produces negative photocurrent for red light illumination and positive photocurrent for green light illumination. Balanced negative and positive photocurrents are obtained by optimizing the Cu2O layer thickness. The imaging capability is experimentally demonstrated for real-life red and green color recognition on a mobile phone display.
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