Title

Optimization Of Gaas Pin Diodes For Neutron Detection

Keywords

Alpha particle; Detector; GaAs; Neutron detector; Particle detection

Abstract

GaAs-based PIN detectors with mesa sizes 1, 2.5, 5, 7.5 and 10 mm were fabricated and characterized for alpha particle response using a Po-210 alpha source. By decoupling the neutron conversion process of a proximity moderator, we were able to directly probe the alpha response characteristics of the PIN detectors as a function of device area. Dark current levels in the PIN detectors ranged from 6.1 to 9.5 pA at zero bias. The dark current values were higher for larger devices and a linear relationship between mesa size and dark current was observed. The PIN detectors were found to have a strong alpha response of up to 5 nA/mm2 with a linear relation between the response current and mesa area. The measured responsivity of the detectors was 0.014 A/W. The average device efficiency was determined to be 31.5%. Using the measured alpha response properties of the GaAs PIN diodes one is able to select the optimal device area for a given moderator and application specific neutron flux.

Publication Date

5-22-2007

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

6468

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.699528

Socpus ID

34248590011 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34248590011

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