Halide Vapor Phase Epitaxy of Ge from an Elemental Source

da Costa, Edgard Winter; Goh, Megan; Schulte, Kevin L.; Young, Matthew R.; Simon, John; Ptak, Aaron J.

doi:10.1021/acs.cgd.4c01615

Title: Halide Vapor Phase Epitaxy of Ge from an Elemental Source

Journal Article · 22 February 2025 · Crystal Growth and Design

DOI: https://doi.org/10.1021/acs.cgd.4c01615 · OSTI ID:2545696

^[1];

^[2];

^[1]; Young, Matthew R. ^[1]; Simon, John ^[1]; Ptak, Aaron J. ^[1]

National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Amherst College, MA (United States)

Halide vapor phase epitaxy shows promise for low-cost photovoltaic device manufacturing because of its high growth rates and lower cost elemental precursors but previously has not been used to deposit epitaxial Ge. Here, we demonstrate Ge deposition by generating GeCl₂ in situ from solid Ge and HCl in a N₂ ambient. To achieve Ge growth, we inject AsH₃ and PH₃ as sources of active hydrogen to the growth surface to create a driving force for growth. We do not observe Ge growth unless a supply of hydrogen is added, consistent with thermodynamic calculations. Furthermore, we show the hydrogen source must crack readily on the substrate surface to enable growth; relatively stable sources such as H₂ do not cause growth. Unintentional group V doping is one drawback of using AsH₃ and PH₃ to drive the Ge reaction. We observed As or P concentrations in the Ge films ranging from 4 x 10¹⁷ to 1 x 10¹⁸ atoms/cm³, concentrations that can drastically influence device characteristics. However, we note there are numerous other "helper molecule" options that can provide active hydrogen without doping or etching the material. This work provides a path forward for Ge deposition for optoelectronic devices from an elemental source.

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

Sponsoring Organization:: Operational Energy Capability Improvement Fund (OECIF); USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2545696

Report Number(s):: NREL/JA--5K00-92287; MainId:94068; UUID:416176e0-95a0-455f-be40-ed588d96b685; MainAdminId:76237

Journal Information:: Crystal Growth and Design, Journal Name: Crystal Growth and Design Journal Issue: 5 Vol. 25; ISSN 1528-7483

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Halide Vapor Phase Epitaxy of Ge from an Elemental Source

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