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Proceedings Paper

Gibbs free energy assisted passivation layers
Author(s): Omer Salihoglu; T. Tansel; M. Hostut; Y. Ergun; A. Aydinli
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Paper Abstract

Reduction of surface leakage is a major challenge in most photodetectors that requires the elimination of surface oxides on etched mesas during passivation. Engineering the passivation requires close attention to chemical reactions that take place at the interface during the process. In particular, removal of surface oxides may be controlled via Gibbs reactivity. We have compared electrical performance of type-II superlattice photodetectors, designed for MWIR operation, passivated by different passivation techniques. We have used ALD deposited Al2O3, HfO2, TiO2, ZnO, PECVD deposited SiO2, Si3N4 and sulphur containing octadecanethiol (ODT) selfassembled monolayers (SAM) passivation layers on InAs/GaSb p-i-n superlattice photodetectors with cutoff wavelength at 5.1 μm. In this work, we have compared the result of different passivation techniques which are done under same conditions, same epitaxial structure and same fabrication processes. We have found that ALD deposited passivation is directly related to the Gibbs free energy of the passivation material. Gibbs free energies of the passivation layer can directly be compared with native surface oxides to check the effectiveness of the passivation layer before the experimental study.

Paper Details

Date Published: 20 May 2016
PDF: 7 pages
Proc. SPIE 9819, Infrared Technology and Applications XLII, 98190R (20 May 2016); doi: 10.1117/12.2223389
Show Author Affiliations
Omer Salihoglu, Bilkent Univ. (Turkey)
T. Tansel, Hacettepe Univ. (Turkey)
M. Hostut, Akdeniz Univ. (Turkey)
Y. Ergun, Anadolu Univ. (Turkey)
A. Aydinli, Bilkent Univ. (Turkey)


Published in SPIE Proceedings Vol. 9819:
Infrared Technology and Applications XLII
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton, Editor(s)

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