Band Discontinuities: A Simple Electrochemical Approach

Kow-Ming Chang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A new, simple but general analytic description of the band discontinuities at a semiconductor heterojunction is derived from the fundamental electrochemical principle. We include the effects of nonuniform band structure and carrier degeneracy (Fermi-Dirac statistics), dielectric image forces, quantum-mechanical exchange-correlation forces, and dipole forces across the interface. These nonideal effects (band model parameters) are expressed in terms of the activity coefficients (thermodynamic parameters) of the carriers. Furthermore, we find a simple but general correlation between the energy band discontinuities and the activity coefficients of the carriers. Such a mathematical link between the two quantities shows that the thermodynamic parameters are important to the physics that determines the band discontinuities.

Original languageEnglish
Pages (from-to)883-887
Number of pages5
JournalIEEE Transactions on Electron Devices
Issue number4
StatePublished - Apr 1990

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