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Updated: Oct 7, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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First-Principles Density Functional Theory Study of Modified Germanene-Based Electrode Materials.

Xue Si¹, Weihan She¹, Qiang Xu²

¹School of Physics, Changchun Normal University, Changchun 130032, China.

Materials (Basel, Switzerland)

|January 11, 2022

Summary

This summary is machine-generated.

Germanene shows promise for supercapacitors. Doping, defects, and multilayering significantly boost its quantum capacitance by altering electronic states and Fermi level, with higher defect concentrations yielding greater enhancement.

Keywords:

adsorption germanene quantum capacitance supercapacitors

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Last Updated: Oct 7, 2025

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Area of Science:

Materials Science
Condensed Matter Physics
Computational Chemistry

Background:

Germanene, a 2D material with a wrinkled atomic structure and high surface area, is a promising candidate for supercapacitor electrodes.
Supercapacitors require electrode materials with high quantum capacitance for efficient energy storage.

Purpose of the Study:

To investigate methods for enhancing the quantum capacitance of germanene for supercapacitor applications.
To explore the effects of doping, defects, and multilayering on germanene's electronic properties.

Main Methods:

First-principles calculations based on Density Functional Theory (DFT).
Analysis of electronic structure modifications induced by doping, vacancy defects, and multilayered configurations.

Main Results:

Quantum capacitance of germanene can be significantly improved through doping/co-doping, vacancy defects, and multilayered structures.
Enhancement in quantum capacitance is attributed to the creation of localized states near the Dirac point and Fermi level shifts.
A monotonic increase in quantum capacitance was observed with increasing defect concentration.

Conclusions:

Germanene's quantum capacitance is highly tunable through atomic-level modifications.
Engineered germanene, particularly with controlled defects, offers a pathway to advanced supercapacitor electrode materials.