Systematic study of high performance GeSn photodiodes with thick absorber for SWIR and extended SWIR detection
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2026
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| _version_ | 1866914334099111936 |
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| author | Thai, Quang Minh Kumar, Rajesh Ali, Abdulla Said Rudie, Justin Akwabli, Steven Qiu, Yunsheng Benamara, Mourad Stanchu, Hryhorii Dahal, Kushal Ma, Xuehuan Acharya, Sudip Chang, Chun-Chieh Forcherio, Gregory T. Claflin, Bruce Du, Wei Yu, Shui-Qing |
| author_facet | Thai, Quang Minh Kumar, Rajesh Ali, Abdulla Said Rudie, Justin Akwabli, Steven Qiu, Yunsheng Benamara, Mourad Stanchu, Hryhorii Dahal, Kushal Ma, Xuehuan Acharya, Sudip Chang, Chun-Chieh Forcherio, Gregory T. Claflin, Bruce Du, Wei Yu, Shui-Qing |
| contents | Germanium-tin (GeSn) photodiodes potentiate a viable solution to integrate SWIR and extended SWIR detection technology into CMOS processing line. However, challenges in the growth of thick, high quality GeSn limit the device absorber thickness, making it impossible to ascertain the performance limit of GeSn photodiodes. An in-depth understanding of their device physics and a clear optimization pathway towards commercial-grade devices remain elusive. This work presents a systematic empirical study of GeSn photodiodes with thick absorber (2 to 8% Sn content, up to 2630 nm thick), showing high responsivity up to 0.59 A.W-1 at 1.55 μm and 0.43 A.W-1 at 2 μm wavelengths, low dark current density down to 2 x 10-2 A.cm-2, and high detection cutoff wavelengths up to 2.1 and 2.5 μm at 5% and 8% Sn, respectively. Using specific doping design (P-i-N and N-i-P), an in-depth analysis is presented on the impact of junction position, p-type background carrier concentration, bulk/ surface defects and photocarrier diffusion length - on photodetection performance. Different optimization strategies for GeSn photodiodes, in particular at high Sn content, are proposed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_15223 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Systematic study of high performance GeSn photodiodes with thick absorber for SWIR and extended SWIR detection Thai, Quang Minh Kumar, Rajesh Ali, Abdulla Said Rudie, Justin Akwabli, Steven Qiu, Yunsheng Benamara, Mourad Stanchu, Hryhorii Dahal, Kushal Ma, Xuehuan Acharya, Sudip Chang, Chun-Chieh Forcherio, Gregory T. Claflin, Bruce Du, Wei Yu, Shui-Qing Instrumentation and Detectors Applied Physics Germanium-tin (GeSn) photodiodes potentiate a viable solution to integrate SWIR and extended SWIR detection technology into CMOS processing line. However, challenges in the growth of thick, high quality GeSn limit the device absorber thickness, making it impossible to ascertain the performance limit of GeSn photodiodes. An in-depth understanding of their device physics and a clear optimization pathway towards commercial-grade devices remain elusive. This work presents a systematic empirical study of GeSn photodiodes with thick absorber (2 to 8% Sn content, up to 2630 nm thick), showing high responsivity up to 0.59 A.W-1 at 1.55 μm and 0.43 A.W-1 at 2 μm wavelengths, low dark current density down to 2 x 10-2 A.cm-2, and high detection cutoff wavelengths up to 2.1 and 2.5 μm at 5% and 8% Sn, respectively. Using specific doping design (P-i-N and N-i-P), an in-depth analysis is presented on the impact of junction position, p-type background carrier concentration, bulk/ surface defects and photocarrier diffusion length - on photodetection performance. Different optimization strategies for GeSn photodiodes, in particular at high Sn content, are proposed. |
| title | Systematic study of high performance GeSn photodiodes with thick absorber for SWIR and extended SWIR detection |
| topic | Instrumentation and Detectors Applied Physics |
| url | https://arxiv.org/abs/2602.15223 |