Zhi-Xiang Zhang, Jin-Song Yao, Lin Liang, Xiao-Wei Tong, Yi Lin, Feng-Xia Liang,* Hong-Bin Yao, Lin-Bao Luo,*

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Abstract: Photocoupler is a kind of semiconductor optoelectronic device which integrates light-emitting device (LED) and photodetector. It has found wide application in various fields due to 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 combining a perovskite quantum dots LED and photovoltaic perovskite photodetector on a glass substrate. The as-fabricated photocoupler showed outstanding characteristics with a 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 (rise time/fall time). 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.