Enhancement of silicon sub-bandgap photodetection by helium-ion implantation
Received date: 13 Sep 2023
Accepted date: 03 Nov 2023
Copyright
Silicon sub-bandgap photodetectors can detect light at the infrared telecommunication wavelengths but with relatively weak photo-response. In this work, we demonstrate the enhancement of sub-bandgap photodetection in silicon by helium-ion implantation, without affecting the transparency that is an important beneficial feature of this type of photodetectors. With an implantation dose of 1 × 1013 ions/cm2, the minimal detectable optical power can be improved from – 33.2 to – 63.1 dBm, or, by 29.9 dB, at the wavelength of 1550 nm, and the photo-response at the same optical power (– 10 dBm) can be enhanced by approximately 18.8 dB. Our work provides a method for strategically modifying the intrinsic trade-off between transparency and strong photo-responses of this type of photodetectors.
Zhao Wang , Xiaolei Wen , Kai Zou , Yun Meng , Jinwei Zeng , Jian Wang , Huan Hu , Xiaolong Hu . Enhancement of silicon sub-bandgap photodetection by helium-ion implantation[J]. Frontiers of Optoelectronics, 2023 , 16(4) : 41 . DOI: 10.1007/s12200-023-00096-x
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