Engineering the Interfacial Electronic Structure of Epitaxial Ge/AlAs(001) Heterointerfaces via Substitutional Boron Incorporation: The Roles of Doping and Interface Stoichiometry

Michael B. Clavel, Gabriel Greene-Diniz, Myrta Grüning, Karen T. Henry, Markus Kuhn, Robert J Bodnar, Mantu K. Hudait

Research output: Contribution to journalArticle

Abstract

A joint experimental and theoretical framework for the decoupling of boron (B) doping and stoichiometric-induced modifications to the structural properties and electronic band structure of germanium (Ge)/AlAs(001) heterostructures is presented. The effect of B-induced stress on nearest-neighbor Ge bonds is quantified via X-ray diffractometry and Raman spectroscopic analysis and subsequently interpreted through the lens of density functional perturbation theory. Similarly, experimental determination of the energy band alignment at the p-type Ge:B/AlAs heterointerface is understood using a density functional theory approach to model the influence of heterointerface stoichiometry and interatomic bonding between group IV and III–V interfacial atoms on the valence and conduction band discontinuities. The modeled two monolayer interatomic diffusion at the Ge/AlAs heterointerface is confirmed via atom probe tomography analysis, demonstrating a ∼6 Å interfacial width. These results present a unified picture of the Ge:B/AlAs(001) material system, highlighting the influence of B on its structural and electronic properties, and provide a path for the engineering of such heterointerfaces through high concentration dopant incorporation within the overlying Ge epilayer.
Original languageEnglish
Pages (from-to)2646-2654
JournalACS Applied Electronic Materials
Volume1
Issue number12
Early online date11 Nov 2019
DOIs
Publication statusPublished - 24 Dec 2019

Fingerprint Dive into the research topics of 'Engineering the Interfacial Electronic Structure of Epitaxial Ge/AlAs(001) Heterointerfaces via Substitutional Boron Incorporation: The Roles of Doping and Interface Stoichiometry'. Together they form a unique fingerprint.

  • Cite this