# Enhancement of thermoelectric power factor in CaGe2 films through interlayer atomic modulation

https://mdr.nims.go.jp/datasets/1cb944c5-dc3e-4ba5-aa03-090ff029f297

## File

- [MDI-APL-EditorsPick-Enhancement of thermoelectric power factor in CaGe2 films through interlayer atomic modulation.pdf](https://mdr.nims.go.jp/filesets/1f3041fa-4bf6-4d06-b206-0f184d34afad/download) ([Detail](https://mdr.nims.go.jp/filesets/1f3041fa-4bf6-4d06-b206-0f184d34afad.md))

## Id

1cb944c5-dc3e-4ba5-aa03-090ff029f297

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-08T15:57:02.048270Z

## Updated at

2025-11-11T07:30:25.744974Z

## Published at

2025-11-11T07:24:11.107454Z

## Doi

https://doi.org/10.48505/nims.5890

## First published url

https://doi.org/10.1063/5.0250240

## Date published

2025-03-01

## Recorded date published

2025-3-1

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Enhancement of thermoelectric power factor in CaGe2 films through interlayer
    atomic modulation
  title_type: original
  lang: en

## Description

- description: Group IVA elements Si and Ge and their compounds possess abundant natural
    distribution and excellent electrical properties that are widely utilized in Si-based
    technology. The exploration for potentially high-performance thermoelectric materials
    within the Group IVA elements is a viable pursuit. In this work, Ca intercalated
    Germanene -CaGe2 films were grown on sapphire substrates by molecular beam epitaxy.
    It is found that the partial lack of Ca between the germanene buckled layers effectively
    increases the Seebeck coefficient without restraining the conductivity. A maximum
    power factor of 170 μW/mK2 at 523 K, which is 7 times larger than the stoichiometric
    CaGe2 film, was achieved in Ca0.835Ge2 film by suppression of bipolar effect and
    formation of a Ca deficient phase. This study presents a promising novel approach
    to tuning the thermoelectric properties of layered semimetal materials through
    interlayer atomic modulation which induces the buckled structure of the framework
    layer, thereby modifying the electronic structure.
  description_type: abstract
  lang: und

## Creator

- name: Zhao Hu
  role: author
  orcid: https://orcid.org/0000-0003-4252-6572
  organization: National Institute for Materials Science
- name: Kenneth Magallon Senados
  role: author
- name: Takeaki Sakurai
  role: author
- name: Takashi Aizawa
  role: author
  orcid: https://orcid.org/0000-0003-2357-5336
  organization: National Institute for Materials Science
- name: Takao Mori
  role: author
  orcid: https://orcid.org/0000-0003-2682-1846
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: thermoelectric
  schema: not_defined

## Rights

- description: 'This article may be downloaded for personal use only. Any other use
    requires prior permission of the author and AIP Publishing. This article appeared
    in Zhao Hu, et al. "Enhancement of thermoelectric power factor in CaGe2 films
    through interlayer atomic modulation" Appl. Phys. Lett. 24 March 2025; 126 (12):
    123102. and may be found at https://doi.org/10.1063/5.0250240.'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Applied Physics Letters
  issn: '10773118'
  volume: '126'
  issue: '12'
  start_page: 123102
  end_page: 123102
  article_number: '123102'

## Conference



## Related item



## Funding

- identifier: JPMJMI19A1
  funder_name: JST-Mirai Program

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



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## Fileset

- id: 1f3041fa-4bf6-4d06-b206-0f184d34afad
  filename: MDI-APL-EditorsPick-Enhancement of thermoelectric power factor in CaGe2
    films through interlayer atomic modulation.pdf
  content_type: application/pdf
  size: 847761
  md5: b83f8f4d62659015b212d79b6a051b73

## Thumbnail

fileset_id: 1f3041fa-4bf6-4d06-b206-0f184d34afad
filename: MDI-APL-EditorsPick-Enhancement of thermoelectric power factor in CaGe2
  films through interlayer atomic modulation.pdf