Development of SWIR single photon avalanche diode

2024-04-12 (Fri) 10:00

Avalanche photodiodes (APDs), operated in Geiger mode (sometimes called single-photon avalanche diodes, SPADs), have developed over the last 35 years and been widely utilized in quantum technology applications. For example, Canon has developed a 3.2-megapixel Silicon SPADs array sensor. However, the silicon bandgap, 1.12 eV at room temperature, stops working in the SWIR region. There is a growing demand for SPADs operating beyond the spectral range of silicon, especially in the SWIR range due to the availability of low-loss telecommunication fibres and eye-safe free space transmission. Here, I will present our innovation in III-V avalanche materials which can be utilized in the new generation of InP-based SPADs operating at 1550 nm. We have found that the Sb-containing avalanche materials have lower excess noise factors, higher trigger probability and weaker temperature dependence, compared to current material such as InP and InAlAs. Then I will discuss our recent results on the development of surface-nominal illuminated SWIR Ge-on-Si SPADs.

Xin Yi is EPSRC Research Fellow hosted at Heriot-Watt University since 2023 (tenure track). He was a Postdoctoral Research Associate at Heriot-Watt in 2020-2022. He completed a BEng (2015) and a PhD (2020) at The University of Sheffield. He works on avalanche photodiodes and has co-authored more than 10 peer-review journal papers including Nat Photonics, Nat Communications etc. He is the recipient of EPSRC Quantum Technology Carrer Development Fellowship (2022) and EPSRC New Investigator Award (2024).