Influence of Sodium Concentration on the Optoelectronic Properties of Silicon Clathrate Films
Due to their original optoelectronic properties and cage-like structure, type-II silicon clathrate (NaxSi136) films are investigated as a new silicon-based material for energy applications. In view of the devices and applications, understanding the energy levels of these clathrates is crucial and needs to be investigated as they vary strongly with Na concentration. In this study, we determined the optical bandgap energy, work function, ionization energy, and surface photovoltage for a wide range of compositions ranging from Na0.1Si136 to Na23Si136. Our findings reveal that the semiconducting properties and potential as solar cell absorbers are dramatically dependent on the Na concentration, with nearly Na-free cages showing the most promise for device applications.
Authors
- Jérémy Bartringer
- A. Slaoui (ORCID: https://orcid.org/0000-0001-8202-2833)
- Anil Kumar Bharwal (ORCID: https://orcid.org/0000-0002-7350-1637)
- Romain Vollondat (ORCID: https://orcid.org/0000-0002-8493-8498)
- Thomas Fix (ORCID: https://orcid.org/0000-0002-1531-725X)
- D. Stoeffler (ORCID: https://orcid.org/0000-0002-1637-0183)
- A. Dinia (ORCID: https://orcid.org/0000-0002-3299-7998)
- Charif Tamin
- Stéphane Roques (ORCID: https://orcid.org/0009-0004-9729-3707)
- Céline Chevalier (ORCID: https://orcid.org/0000-0002-7411-089X)
Institutions
- Université Claude Bernard Lyon 1 (FR)
- École Centrale de Lyon (FR)
- Centre National de la Recherche Scientifique (FR)
- Institut des Nanotechnologies de Lyon (FR)
- Institut de Physique et Chimie des Matériaux de Strasbourg (FR)
- Institut National des Sciences Appliquées de Lyon (FR)
- École d'Ingénieurs en Chimie et Sciences du Numérique (FR)
- Université de Strasbourg (FR)
Publication Details
- Journal
- ACS Applied Energy Materials
- Published
- 2024-09-13
- DOI
- https://doi.org/10.1021/acsaem.4c01514
- Citations
- 14
- Primary Topic
- Semiconductor materials and interfaces
- Type
- article
- Field-Weighted Citation Impact
- 4.73
Funders
- Equipex
- Agence Nationale de la Recherche
- Université de Strasbourg