Influence of Sodium Concentration on the Optoelectronic Properties of Silicon Clathrate Films - Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg
Journal Articles ACS Applied Energy Materials Year : 2024

Influence of Sodium Concentration on the Optoelectronic Properties of Silicon Clathrate Films

Abstract

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.
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Year Month Jours
Avant la publication
Wednesday, April 23, 2025
Embargoed file
Wednesday, April 23, 2025
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Dates and versions

hal-04747308 , version 1 (23-10-2024)

Identifiers

Cite

Anil Kumar Bharwal, Romain Vollondat, Charif Tamin, Stéphane Roques, Jérémy Bartringer, et al.. Influence of Sodium Concentration on the Optoelectronic Properties of Silicon Clathrate Films. ACS Applied Energy Materials, 2024, 7 (19), pp.8554-8561. ⟨10.1021/acsaem.4c01514⟩. ⟨hal-04747308⟩
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