Multiband GaN/AlGaN UV Photodetector

• Authors: K. Korona , A. Drabińska , K. Pakuła , J. Baranowski
• Languages of publication: EN

Abstracts

EN

We present optical and electrical measurements made on GaN/AlGaN photodetector structure capable to detect three UV ranges, tuned by external voltage. The highest band at energy of about 3.85 eV is nearly independent of bias applied to the Schottky contact. Photosensitivity of the second band at about 3.65 eV changes strongly with the bias. Signal in this range increases about 20 times when the bias changes from 0 V to -4 V. Photosensitivity of the third band (3.4 eV) appears for strong reverse bias (-3 V). Characteristics of the detector are in qualitative agreement with numerical model, however deep centers present in the AlGaN layers cause quantitative discrepancies. The concentration of defects of the order of 10^{16} cm^{-3} was estimated from current transients.

Keywords

EN

72.40.+w; 73.61.Ey; 73.40.Kp

Discipline

• 73.61.Ey: III-V semiconductors
• 73.40.Kp: III-V semiconductor-to-semiconductor contacts,p-njunctions, and heterojunctions
• 72.40.+w: Photoconduction and photovoltaic effects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 110
• Issue: 2
• Pages: 211-217

Dates

published

2006-08

received

2006-06-17

Contributors

author

K. Korona

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

A. Drabińska

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

K. Pakuła

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

J. Baranowski

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

References

• 1. F. Bernardini, V. Fiorentini, D. Vanderbilt, Phys. Rev. B, 56, R10024, 1997
• 2. A. Drabińska, K.P. Korona, R. Bozek, J.M. Baranowski, K. Pakula, T. Tomaszewicz, Phys. Status Solidi C, 0, 329, 2003
• 3. D. Jena, S. Heikman, J.S. Speck, A. Gossard, U.K. Mishra, A. Link, O. Ambacher, Phys. Rev. B, 67, 153306, 2003
• 4. J. Hwang, M.H. Song, B. Park, S. Nishimura, T. Toyooka, J.W. Wu, Y. Takanishi, K. Ishikawa, H. Takezoe, Nature Mater., 4, 383, 2005
• 5. K.P. Korona, A. Drabińska, A. Trajnerowicz, R. Bozek, K. Pakula, J.M. Baranowski, Acta Phys. Pol. A, 103, 675, 2003
• 6. D.E. Aspnes, A.A. Studna, Phys. Rev. B, 7, 4605, 1973
• 7. A. Drabińska, K.P. Korona, K. Pakula, J.M. Baranowski, submitted to Phys. Status Solidi A

Identifiers

DOI

10.12693/APhysPolA.110.211