Theoretical study of potential ultralow-noise confined-state photodetectors

Yang Wang; Nabil S. Mansour; Ali F. Salem; Kevin F. Brennan; P. Paul Ruden

doi:10.1117/12.158565

15 October 1993 Theoretical study of potential ultralow-noise, confined-state photodetectors

Yang Wang, Nabil S. Mansour, Ali F. Salem, Kevin F. Brennan, P. Paul Ruden

Proceedings Volume 2022, Photodetectors and Power Meters; (1993) https://doi.org/10.1117/12.158565
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

The purpose of this paper is to present a review of the basic issues implicit in the design of confined state photodetectors. The basic device structure consists of repeated unit cells each comprised of a narrow gap semiconductor layer sandwiched between barrier layers of wider band gap material. Gain in these structures is derived through carrier multiplication via impact excitation of confined electrons out of the narrow gap semiconductor layer. Different device designs are considered in an attempt to maximize the device gain at minimum dark current. In some implementations, the barrier layers are chosen to be graded such that the leading edge discontinuity is at least twice that at the trailing edge of the well forming an asymmetric well design. It is found that an asymmetric well design offers a much higher impact excitation of electrons confined within the well at lower operating voltage than a symmetric well design however at the expense of increased dark current. Quantum versus classical confinement of the electrons within the well is also investigated.

Citation Download Citation

Yang Wang, Nabil S. Mansour, Ali F. Salem, Kevin F. Brennan, and P. Paul Ruden "Theoretical study of potential ultralow-noise, confined-state photodetectors", Proc. SPIE 2022, Photodetectors and Power Meters, (15 October 1993); https://doi.org/10.1117/12.158565

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KEYWORDS

Electrons

Ionization

Photodetectors

Photomultipliers

Phonons

Scattering

Gallium nitride

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