High Carrier Lifetimes in Epitaxial Germanium-Tin/Al(In)As Heterostructures with Variable Tin Compositions

Hudait, Mantu K.; Johnston, Steven W.; Clavel, Michael B.; Bhattacharya, Shuvodip; Karthikeyan, Sengunthar; Joshi, Rutwik

doi:10.1039/D2TC00830K

High Carrier Lifetimes in Epitaxial Germanium-Tin/Al(In)As Heterostructures with Variable Tin Compositions

Journal Article · 23 June 2022 · Journal of Materials Chemistry C

DOI:https://doi.org/10.1039/D2TC00830K· OSTI ID:1880807

Hudait, Mantu K.; ; Clavel, Michael B.; Bhattacharya, Shuvodip; Karthikeyan, Sengunthar; Joshi, Rutwik

Group IV-based germanium-tin (Ge1-ySny) compositional materials have recently shown great promise for infrared detection, light emission and ultra-low power transistors. High carrier lifetimes are desirable for enhancing the detection limit and efficiency of photodetectors, low threshold current density in lasers, and low tunneling barrier height by lowering defects and dislocations at the heterointerface of a source and a channel. Here, carrier lifetimes in epitaxial germanium (Ge) and variable tin (Sn) compositional Ge1-ySny materials were experimentally determined on GaAs substrates using the contactless microwave photoconductive decay (u-PCD) technique at an excitation wavelength of 1500 nm. Sharp (2 x 2) reflection high energy electron diffraction patterns and low surface roughness were observed from the surface of the Ge0.97Sn0.03 epilayer. X-ray rocking curves from Ge0.97Sn0.03 and Ge0.94Sn0.06 layers demonstrated the pseudomorphic and lattice-matched growth on AlAs and In0.12Al0.88As buffers, respectively, further substantiated by reciprocal space maps and abrupt heterointerfaces evident from the presence of Pendellosung oscillations. High effective carrier lifetimes of 150 ns to 450 ns were measured for Ge1-ySny epilayers as a function of Sn composition, surface roughness, growth temperature, and layer thickness. The observed increase in the carrier lifetime with an increasing Ge layer thickness and a reducing surface roughness, by incorporating Sn, were explained. The enhancement of the carrier lifetime with an increasing Sn concentration was achieved by controlling the defects with lattice-matched Ge0.94Sn0.06/In0.12Al0.88As heterointerfaces or the pseudomorphic growth of Ge0.94Sn0.06 on GaAs. Therefore, our monolithic integration of variable Sn alloy compositional Ge1-ySny materials with high carrier lifetimes opens avenues to realize electronic and optoelectronic devices.

Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE National Renewable Energy Laboratory (NREL); National Science Foundation (NSF)

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 1880807

Report Number(s):: NREL/JA-5K00-81502; MainId:82275; UUID:f9b6ee5f-a033-45d0-9dcc-b2ac24b435ae; MainAdminID:65069

Journal Information:: Journal of Materials Chemistry C, Vol. 10, Issue 29

Country of Publication:: United States

Language:: English

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INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY,MATERIALS SCIENCE
carrier lifetimes
contactless microwave photoconductive decay
epitaxial germanium
GeSn
variable tin

High Carrier Lifetimes in Epitaxial Germanium-Tin/Al(In)As Heterostructures with Variable Tin Compositions

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