design of optical component structure for AlxGa1-xN photocathodes

Mingzhu Yang; Benkang Chang; Guanghui Hao

doi:10.1117/12.2192196

29 July 2015 Design of optical component structure for Al_xGa_1-xN photocathodes

Mingzhu Yang, Benkang Chang, Guanghui Hao

Proceedings Volume 9659, International Conference on Photonics Solutions 2015; 965918 (2015) https://doi.org/10.1117/12.2192196
Event: International Conference on Photonics Solutions 2015, 2015, Hua Hin, Thailand

Abstract

AlxGa1-xN photocathode was prepared by MOCVD and the reflectivity, transmittance, and absorptivity were test. Based on thin film principle, optical model of t-mode AlxGa1-xN photocathodes was built, and then optical properties and quantum efficiencies were simulated. Results show that AlxGa1-xN photocathodes satisfy the need of detectors with “solar blind” property when the Al component is larger than 0.250. There is an optimal thickness of AlxGa1-xN layer to obtain highest quantum efficiency, and the optimal thickness is 0.3μm. There is close relation between absorptivity and quantum efficiency, which is in good agreement with the “three-step” model. This work gives a reference for the design and preparation of AlxGa_1-xN photocathodes.

Citation Download Citation

Mingzhu Yang, Benkang Chang, and Guanghui Hao "Design of optical component structure for Al_xGa_1-xN photocathodes", Proc. SPIE 9659, International Conference on Photonics Solutions 2015, 965918 (29 July 2015); https://doi.org/10.1117/12.2192196

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