1. An optical-beam-induced-current study of active region and charge collection efficiency of GaAs particle detectors
- Author
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Claudio Canali, C. Lanzieri, Antonio Castaldini, Antonino Zichichi, Saverio D'Auria, C. Del Papa, Anna Cavallini, A. Cetronio, L. Berluti, M. Alietti, M. Proia, Filippo Nava, and P. Rinaldi
- Subjects
Physics ,Nuclear and High Energy Physics ,Range (particle radiation) ,Optical beam-induced current ,business.industry ,Photoconductivity ,Context (language use) ,Particle detector ,Semiconductor detector ,Gallium arsenide ,chemistry.chemical_compound ,chemistry ,Optoelectronics ,Detectors and Experimental Techniques ,business ,Instrumentation ,Diode - Abstract
In a recent paper, it was described how semi-insulating (SI) liquid encapsulated Czochralski (LEC) gallium arsenide particle detectors made by Alenia SpA have been tested and found to be understandable in terms of one function: the local charge collection efficiency. We have now measured, always within the context of the RD8 experiment, the local charge collection efficiency for these diodes using a technique called OBIC (optical beam induced current) and derived the active region width ( W ) as a function of bias in a range of values lower than those obtainable with particles. Using data both from OBIC and from the previous paper, W is found to behave approximately linearly as a function of bias larger than about 50 V. Below this value, W follows a square root law as a function of bias.
- Published
- 1995
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