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Nanoscience & Nanotechnology-Asia

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ISSN (Print): 2210-6812
ISSN (Online): 2210-6820

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Research Article

Multiple Quantum Barrier Nano-avalanche Photodiodes - Part II: Excess Noise Characteristics

Author(s): Somrita Ghosh and Aritra Acharyya*

Volume 9, Issue 2, 2019

Page: [185 - 191] Pages: 7

DOI: 10.2174/2210681208666180813123035

Price: $65

Abstract

Background: Excess noise characteristics of Multiple Quantum Barrier (MQB) nanoscale avalanche photodiodes (APDs) based on Si~3C-SiC heterostructures have been studied in this part of the paper. The multiplication gain and Excess Noise Factor (ENF) of the MQB APDs have been calculated by varying the number of Quantum Barriers (QBs).

Methods: The numerically calculated ENF values of MQB APDs have been compared with the ENF of Si flat conventional APDs of similar dimensions and it is observed that the use of QBs leads to significant reduction in ENF of the APDs under similar biasing and illumination conditions.

Results: The enhanced ratio of hole to electron ionization rates in MQB structures as compared to the bulk Si APD structure has been found to be the primary cause of improvement in the noise performance of the MQB nano-APDs.

Conclusion: Finally, the numerically calculated ENF of Si flat APD has been compared with the experimentally measured ENF of a commercially available Si APD and those are found to be in good agreement; this comparison validates the simulation methodology adopted by the authors in this paper.

Keywords: Avalanche photodiodes, excess noise factor, multiplication gain, multiple quantum barrier (MQB), Si~3C-SiC heterostructures, Excess Noise Factor (ENF).

Graphical Abstract

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