The effects of temperature on space charge and internal electric field distribution in CdZnTe detector

Lili Liu; Rongrong Guo; Yushen Tong; Weilong Chen; Jinhai Lin; Chen Wang

doi:10.1117/12.2605324

24 November 2021 The effects of temperature on space charge and internal electric field distribution in CdZnTe detector

Lili Liu, Rongrong Guo, Yushen Tong, Weilong Chen, Jinhai Lin, Chen Wang

Proceedings Volume 12069, AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations; 120690D (2021) https://doi.org/10.1117/12.2605324
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

The effects of temperature on the distribution of space charge and internal electric field in CdZnTe detectors were theoretically simulated by TCAD software. The mechanisms of space charge distribution in CdZnTe detectors at different temperatures and how to manipulate the internal electric field to achieve good detector performance were discussed in this study. The results demonstrated that an uneven internal electric filed distribution was obtained in low temperature. With increasing temperature, the ionized deep levels tended to capture electrons while unionized deep levels to emit electrons. The sub-bandgap light with a wavelength of 850nm and light intensity of 8×10^-8W/cm² were utilized to manipulate space charge distribution by enhancing optical excitation of electrons from the valence band into the ionized deep donor levels. Thus, a flatter internal electric field were achieved, which greatly reduces the probability of carriers being trapped or recombined by defect levels during charge transport processes and then significantly improves the charge collection efficiency of detectors in low temperatures. This simulation results provide a theoretical basis for the application of CdZnTe detectors in astronomical field.

Citation Download Citation

Lili Liu, Rongrong Guo, Yushen Tong, Weilong Chen, Jinhai Lin, and Chen Wang "The effects of temperature on space charge and internal electric field distribution in CdZnTe detector", Proc. SPIE 12069, AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations, 120690D (24 November 2021); https://doi.org/10.1117/12.2605324

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