title: CVD diamond alpha-particle detectors with different electrode geometry.
abstract: 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.
authors.forename: Linjun
authors.initials: L
authors.lastname: Wang
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Lou
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Su
authors.forename: Weimin
authors.initials: W
authors.lastname: Shi
authors.forename: Yiben
authors.initials: Y
authors.lastname: Xia