Scalability of dark current in silicon PIN photodiode

doi:10.1088/1674-1056/27/4/048501

Abstract The mechanism for electrical conduction is investigated by the dark temperature-dependent current-voltage characteristics of Si PIN photodiodes with different photosensitive areas. The characteristic tunneling energy E₀₀ can be obtained to be 1.40 meV, 1.53 meV, 1.74 meV, 1.87 meV, and 2.01 meV, respectively, for the photodiodes with L=0.25 mm, 0.5 mm, 1 mm, 1.5 mm, and 2 mm by fitting the ideality factor n versus temperature curves according to the tunneling-enhanced recombination mechanism. The trap-assisted tunneling-enhanced recombination in the i-layer plays an important role in our device, which is consistent with the experimental result that area-dependent leakage current is dominant with the side length larger than 1 mm of the photosensitive area. Our results reveal that the quality of the bulk material plays an important role in the electrical conduction mechanism of the devices with the side length larger than 1 mm of the photosensitive area.

Keywords: silicon PIN photodiodes dark current tunneling enhanced

Received: 31 July 2017
Revised: 11 January 2018
Accepted manuscript online:

PACS:	85.30.-z	(Semiconductor devices)
	85.60.Dw	(Photodiodes; phototransistors; photoresistors)
	85.60.Gz	(Photodetectors (including infrared and CCD detectors))

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFF0104801) and the National Natural Science Foundation of China (Grant Nos. 61335004, 61675046, and 61505003).

Corresponding Authors: Xiao-Ying He, Xia Guo
E-mail: xyhe@bjut.edu.cn;guox@bupt.edu.cn

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Ya-Jie Feng(丰亚洁), Chong Li(李冲), Qiao-Li Liu(刘巧莉), Hua-Qiang Wang(王华强), An-Qi Hu(胡安琪), Xiao-Ying He(何晓颖), Xia Guo(郭霞) Scalability of dark current in silicon PIN photodiode 2018 Chin. Phys. B 27 048501

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Scalability of dark current in silicon PIN photodiode

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