Comparative study of Si and Ge nanoparticles with exotic core phases for solar energy conversion

S. Wippermann, M. Voros, A. Gali, G. Galli, G. Zimanyi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Third generation photovoltaic cells promise to overcome the Schockley-Quessier limit of solar cell energy conversion. In the Multiple Exciton Generation (MEG) pathway quantum confined highly energetic electron-hole pairs relax by emitting additional electron-hole pairs. The overall utility of this process is undermined, however, by the very fact that quantum confinement pushes the gap of nanoparticles (NPs) out of the solar spectrum. Here we propose that Si and Ge NPs with core structures made out of exotic high-pressure phases of bulk Si and Ge have lower gaps, more intense absorption and higher MEG rates than those of made out of the cubic diamond phase. Some of these exotic phases have already been proven to exist in colloidal NPs or on laser treated surfaces, therefore, our findings may open the door for promising solar applications of such exotic nanoparticle systems.

Original languageEnglish
Title of host publication39th IEEE Photovoltaic Specialists Conference, PVSC 2013
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages989-992
Number of pages4
ISBN (Print)9781479932993
DOIs
Publication statusPublished - Jan 1 2013
Event39th IEEE Photovoltaic Specialists Conference, PVSC 2013 - Tampa, FL, United States
Duration: Jun 16 2013Jun 21 2013

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other39th IEEE Photovoltaic Specialists Conference, PVSC 2013
CountryUnited States
CityTampa, FL
Period6/16/136/21/13

Keywords

  • Multiple exciton
  • Nanoparticles
  • Photovoltaic cells
  • Third generation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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    Wippermann, S., Voros, M., Gali, A., Galli, G., & Zimanyi, G. (2013). Comparative study of Si and Ge nanoparticles with exotic core phases for solar energy conversion. In 39th IEEE Photovoltaic Specialists Conference, PVSC 2013 (pp. 989-992). [6744307] (Conference Record of the IEEE Photovoltaic Specialists Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2013.6744307