Different cap-barrier design for MOCVD grown HOT HgCdTe barrier detectors

• Autorzy: Kopytko, M. , Kębłowski, A. , Gawron, W. , Madejczyk, P.
• Języki publikacji: EN

Abstrakty

EN

The performance of HgCdTe barrier detectors with cut-off wavelengths up to 3.6 μm fabricated using metaloorganic chemical vapour deposition operated at high temperatures is presented. The detectors’ architecture consists of four layers: cap contact, wide bandgap barrier, absorber and bottom contact layer. The structures were fabricated both with n- and p-type absorbing layers. In the paper, different design of cap-barrier structural unit (n-B_p', n⁺-B_p', p+-B_p) were analysed in terms of various electrical and optical properties of the detectors, such as dark current, current responsivity time constant and detectivity. The devices with a p-type cap contact exhibit very low dark current densities in the range of (2÷3)×10⁻⁴ A/cm² at 230 K and the maximum photoresponse of about 2 A/W in wide range of reverse bias voltage. The time constant of measured de- vices with n-type cap contact and p-type absorbing drops below 1 ns with reverse bias while the detectivity is at the level of 1010 cm・Hz1/2/W.

Słowa kluczowe

EN

HgCdTe; barrier infrared detector; high operating temperature; MOCVD

• Czasopismo: Opto-Electronics Review
• Rocznik: 2015
• Tom: Vol. 23, No. 2
• Strony: 143-148
• Opis fizyczny: Bibliogr. 17., il., wykr.

Twórcy

autor

Kopytko, M.

• Institute of Applied Physics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland,

autor

Kębłowski, A.

• Vigo System S.A., 129/133 Poznańska St., 05-850 Ożarow Mazowiecki, Poland

autor

Gawron, W.

• Institute of Applied Physics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

autor

Madejczyk, P.

• Institute of Applied Physics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

Bibliografia

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Uwagi

EN

The work has been done under the financial support of the Polish National Science Centre as research Project No. DEC-2011/03/D/ST7/03161 and the Polish National Centre for Research and Development Centre as the Research Project No. PBS1/B5/2/2012.

Identyfikatory

DOI

10.1515/oere-2015-0017