Si-based Earth abundant clathrates for solar energy conversion

Yuping He, Fan Sui, Susan M. Kauzlarich, Giulia Galli

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We synthesized a Si-based clathrate, composed entirely of Earth abundant elements, and using ab initio calculations and spectroscopic and Hall mobility measurement showed that it is a promising material for solar energy conversion. We found that the type-I clathrate K8Al8Si38 exhibits a quasi-direct band gap of ∼1.0 eV, which may be tuned to span the IR and visible range by strain engineering. We also found that upon light absorption, excited electron and hole states are spatially separated in the material, with low probability of charge recombination. Finally, we computed and measured electron and hole mobilities and obtained values much superior to those of a-Si and approximately 6 to 10 and 10 to 13 time smaller than those of crystalline Si. This journal is

Original languageEnglish (US)
Pages (from-to)2598-2602
Number of pages5
JournalEnergy and Environmental Science
Volume7
Issue number8
DOIs
StatePublished - 2014

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Fingerprint Dive into the research topics of 'Si-based Earth abundant clathrates for solar energy conversion'. Together they form a unique fingerprint.

  • Cite this