Uncooled photovoltaic Hg1-xCdxTe LWIR detectors

Jozef Piotrowski; Miroslaw Grudzien; Zenon Nowak; Zbigniew Orman; Jaroslaw Pawluczyk; Mariusz Romanis; Waldemar Gawron

doi:10.1117/12.409841

15 December 2000 Uncooled photovoltaic Hg_1-xCd_xTe LWIR detectors

Jozef Piotrowski, Miroslaw Grudzien, Zenon Nowak, Zbigniew Orman, Jaroslaw Pawluczyk, Mariusz Romanis, Waldemar Gawron

Proceedings Volume 4130, Infrared Technology and Applications XXVI; (2000) https://doi.org/10.1117/12.409841
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

We report an advanced Hg_1-xCd_xTe photovoltaic detector based on monolithic Hg_1-xCd_xTe heterostructure with 3-dimensional architecture. It consists of a narrow gap, p-type Hg_1-xCd_xTe small size (approximately equals 10x10x7 micrometers ) absorber of infrared radiation buried in a graded gap Hg_1-xCd_xTe layer surrounding absorber and heterojunction contacts obtained by selective doping of the graded gap Hg_1-xCd_xTe layer surrounding the absorber region. The heterostructure is passivated with a ZnS layer and coated with contact metallization to n^PLU and p-type regions. The device is supplied with 50x50 micrometers immersion microlens formed directly in the CdZnTe substrate. These two layers also play a role of a mirror that improves quantum efficiency for weakly absorbed infrared radiation. In addition, the mirror eliminates backside incidence of thermal radiation, which prevents generation of dark current. The design of the device is optimized to achieve the best compromise between requirements of good absorption and collection efficiency; low thermal generation; and low parasitic impedance. Test devices have been prepared using the modified isothermal vapor phase epitaxy of Hg_1-xCd_xTe on profiled CdZnTe substrates, negative epitaxy of Hg_1-xCd_xTe to widen band gap of surface regions, selective doping, multiple chemical etching and ion milling, vacuum deposition of dielectric and metal layers.

Citation Download Citation

Jozef Piotrowski, Miroslaw Grudzien, Zenon Nowak, Zbigniew Orman, Jaroslaw Pawluczyk, Mariusz Romanis, and Waldemar Gawron "Uncooled photovoltaic Hg_1-xCd_xTe LWIR detectors", Proc. SPIE 4130, Infrared Technology and Applications XXVI, (15 December 2000); https://doi.org/10.1117/12.409841

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