Abstract
Fabrication, physical simulation, and optimization of two-terminal Pnp heterojunction phototransistors (2T-HPTs) based on In0.53Ga0.47As/InP are reported. The parameters of fundamental models are determined by comparing the simulated current and response characteristics with the experimental results. To optimize the optical gain and device performance, the precise adjustment of the base doping level, base width, and compositional grading of base has been investigated. Properly reducing the base width or increasing the range of the compositional grading can greatly enhance the emitter injection efficiency. The effects of high-low doping in collector region and the insertion of a thin, undoped InGaAs layer in the base region of the HPT have also been investigated in detail. It is found the high-low doping in collector can form an electric field to aid carrier transport, and the intrinsic layer between emitter and base has functions of reducing knee voltage and the dark current of HPT.
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Acknowledgements
This project is partially supported by the National Natural Science Foundation of China (No. 61307044), the Natural Science Foundation of Jiangsu Province of China (No. BK20130321), the open project of Key Laboratory of Infrared Imaging Materials and Detectors, Chinese Academy of Sciences (No. IIMDKFJJ-15-06), the Research Fund for the Doctoral Program of Higher Education of China (No. 20133201120009), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China, and the Research Innovation Program for College Graduates of Jiangsu Province (SJLX15-0601).
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Chen, J., Zhu, M. Performance optimization of Pnp InGaAs/InP heterojunction phototransistors. Appl. Phys. A 122, 1034 (2016). https://doi.org/10.1007/s00339-016-0565-y
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DOI: https://doi.org/10.1007/s00339-016-0565-y