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High-Performance Photocoupler Based on Perovskite Light Emitting Diode and Photodetector

Zhang, Zhi-Xiang, Yao, Ji-Song, Liang, Lin, Tong, Xiao-Wei, Lin, Yi, Liang, Feng-Xia, Yao, Hong-Bin, Luo, Lin-Bao
ACS applied materials & interfaces 2018 v.10 no.46 pp. 39441-39447
electronic circuits, glass, light emitting diodes, quantum dots, semiconductors
Photocoupler is a kind of semiconductor optoelectronic device that integrates light-emitting device (LED) and photodetector. It has found wide application in various fields because of its capability to transmit the electrical signal through the conversion of the electricity-light-electricity. Herein, we report the fabrication of a new photocoupler by simply integrating perovskite quantum dots LED and perovskite photodetector on a glass substrate. The as-fabricated photocoupler showed outstanding characteristics with high current transfer ratio (CTR) of 3.35%, which is highly competitive in comparison with other materials based devices. Furthermore, the perovskite photocoupler had a fast response speed of 8 μs/8.26 μs. By further adding an amplification circuit, the CTR could be enhanced by around 50 times to 172.6%. These results indicate that the present perovskite-based photocouplers may find potential application in future integrated circuit and optoelectronic system.