Experimental measurements of charge carrier mobility: lifetime products for large sample of pixilated CZT detectors

S. V. Vadawale; M. Shanmugam; Shishir Purohit; Y. B. Acharya; Manju Sudhakar

doi:10.1117/12.931424

25 September 2012 Experimental measurements of charge carrier mobility: lifetime products for large sample of pixilated CZT detectors

S. V. Vadawale, M. Shanmugam, Shishir Purohit, Y. B. Acharya, Manju Sudhakar

Author Affiliations +

Proceedings Volume 8453, High Energy, Optical, and Infrared Detectors for Astronomy V; 84532K (2012) https://doi.org/10.1117/12.931424
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Cadmium-Zinc-Telluride (CZT) is thought to be a primary work horse for hard X-ray astronomy in future. Due to the relatively large band-gap, it offers near room temperature operation while maintaining much better energy resolution then scintillator detectors operating in similar energy range. Further, CZT detectors are available in the form of pixilated detectors with area up to few cm²and hence it is possible to realize very large detector area by having an array of such pixilated CZT detectors. However, it is well known that the energy spectrum of mono-energetic X-ray measured by CZT detectors does not have a Gaussian shape but has significant low-energy tail. This is mainly due to relatively poor mobility and small life time of the charge carriers, particularly of holes, in the CZT crystals. Thus, in order to understand spectral response for a large array of CZT detectors consisting of multiple elements / pixels, it is essential to characterize the mobility-lifetime products of charge carriers for each individual elements / pixels. Here we present experimental measurements of charge carrier mobility-lifetime products for large sample of multi-pixel CZT detectors. The mobility-lifetime products are measured by simultaneously fitting a ‘CZT line’ model to pixel wise spectra of 122 keV X-rays from ⁵⁷Co at three different bias voltages. These were carried out as a part of selection of CZT detector modules for the “High Energy X-ray spectrometer (HEX)” onboard Indian moon mission – Chandrayaan-1.

Citation Download Citation

S. V. Vadawale, M. Shanmugam, Shishir Purohit, Y. B. Acharya, and Manju Sudhakar "Experimental measurements of charge carrier mobility: lifetime products for large sample of pixilated CZT detectors", Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 84532K (25 September 2012); https://doi.org/10.1117/12.931424

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available