Characterizations of bismuth telluride/gallium nitride heterojunction photovoltaic detector for MWIR detection under room temperature

M. Y. Pang, H. F. Lui, W. S. Li, K. H. Wong, C. Surya

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Uncooled infrared detectors have aroused keen interest in narrow bandgap semiconductor research. We propose to use Bismuth Telluride (Bi 2Te3) bandgap energy of about 0.15 eV for middle wavelength IR (MWIR) detection. In this work, a heterojunction structure of Bi2Te3/GaN/Al2O3 was fabricated to form a photovoltaic detector. The structural properties of Bi2Te 3 thin films were characterized by high resolution x-ray diffraction spectroscopy. Crystallinity of Bi2Te3 thin films was found to be strongly dependent on deposition temperatures. The spectral current responsivity for this heterojunction in NIR-to-MWIR region was evaluated under back-side illumination. The devices were also characterized by studying their low-frequency noise spectra measurement. The experimental results suggest that, the noise level of the devices is correlated to the crystallinity of the Bi 2Te3 thin films.

Original languageEnglish
Article number012046
JournalJournal of Physics: Conference Series
Volume152
DOIs
Publication statusPublished - Jan 1 2009
Externally publishedYes

Fingerprint

bismuth tellurides
gallium nitrides
heterojunctions
crystallinity
detectors
room temperature
thin films
wavelengths
infrared detectors
noise spectra
x ray diffraction
illumination
low frequencies
high resolution
spectroscopy
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Characterizations of bismuth telluride/gallium nitride heterojunction photovoltaic detector for MWIR detection under room temperature. / Pang, M. Y.; Lui, H. F.; Li, W. S.; Wong, K. H.; Surya, C.

In: Journal of Physics: Conference Series, Vol. 152, 012046, 01.01.2009.

Research output: Contribution to journalArticle

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