Open AccessCVD diamond alpha-particle detectors with different electrode geometry
Author(s) -
Linjun Wang,
Yanyan Lou,
Qingfeng Su,
Weimin Shi,
Yiben Xia
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.008612
Subject(s) - diamond , materials science , optics , detector , particle detector , nucleation , alpha particle , particle (ecology) , electrode , optoelectronics , physics , atomic physics , composite material , oceanography , quantum mechanics , thermodynamics , geology
In this paper, two types of detectors, one with a coplanar and the other with a sandwich geometry using an identical CVD diamond film, were fabricated in order to investigate the effects of the film microstructure on the performance of diamond film alpha-particle detectors. An average charge collection efficiency of 42.9% for the coplanar structure and of 37.4% for the sandwich structure detectors was obtained, respectively. Raman scattering studies directly demonstrated that the different counts, collection efficiencies and photocurrents of the two types of detectors mainly resulted from the different micro-structural features between the final growth side and the nucleation side of the diamond film. Under alpha particle irradiation the detector with sandwich geometry had a similar trend on energy resolution with coplanar geometry under different applied electric field. A good energy resolution of 1.1% was obtained for both detectors.