Surface study of thioacetamide and zinc sulfide passivated long wavelength infrared type-II strained layer superlattice

Koushik Banerjee; Jun Huang; Siddhartha Ghosh; Runshen Xu; Christos G. Takoudis; Elena Plis; Sanjay Krishna; Sutharsan Ketharanathan; Matthew Chriss

doi:10.1117/12.900198

10 June 2011 Surface study of thioacetamide and zinc sulfide passivated long wavelength infrared type-II strained layer superlattice

Koushik Banerjee, Jun Huang, Siddhartha Ghosh, Runshen Xu, Christos G. Takoudis, Elena Plis, Sanjay Krishna, Sutharsan Ketharanathan, Matthew Chriss

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Proceedings Volume 8012, Infrared Technology and Applications XXXVII; 801243 (2011) https://doi.org/10.1117/12.900198
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

A pH adjusted acidic solution of thioacetamide (TAM) was used as a sulfidizing agent to treat long wavelength infrared (LWIR) superlattice surface for the first time. The results were compared against those for ammonium sulfide [(NH₄)₂S] which have been used earlier for the same purpose. X-ray photoelectron spectroscopy (XPS) results revealed that TAM treatment attains a much pronounced degree of sulfidization on superlattice surface. Electrical measurements on mesa-etched diodes exhibited maximum zero bias dynamic resistance times area (R₀A) value of 590 Ω-cm², approximately a four times improvement compared to (NH₄)₂S treated diodes. XPS studies revealed the reappearance of detrimental oxides on the TAM treated surface after long term air exposure asserting the need for a suitable capping layer to preserve the quality of the surface. Atomic layer deposition (ALD) was used to cap the TAM treated surface with zinc sulfide (ZnS). Precise deposition of few monolayers of ZnS on TAM treated surface was further studied using XPS to understand the evolution of bond formations at the semiconductor-dielectric interface.

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Koushik Banerjee, Jun Huang, Siddhartha Ghosh, Runshen Xu, Christos G. Takoudis, Elena Plis, Sanjay Krishna, Sutharsan Ketharanathan, and Matthew Chriss "Surface study of thioacetamide and zinc sulfide passivated long wavelength infrared type-II strained layer superlattice", Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 801243 (10 June 2011); https://doi.org/10.1117/12.900198

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