Effect of Ge/Si heterostructures on carrier extraction in Si solar cells with Ge quantum dots

Takeshi Tayagaki, Yusuke Hoshi, Kazufumi Ooi, Takanori Kiguchi, Noritaka Usami

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

Abstract

Solar cells using quantum dots (QDs) have been extensively studied, in many of which the open circuit voltage (Voc) always decreases. The mechanism of this Voc reduction has not been understood well. We studied Si solar cells with multi-stacked Ge QDs (Ge/Si QD solar cells), in which the type-II Ge/Si band offsets are formed. From the current-voltage characteristics, the Voc is found to increase at low temperatures, indicating that the Voc reduction is due to thermal excitation of carriers. By comparing solar cells with different Ge thicknesses, we found that the Voc reduction depends strongly on the Ge thickness.

Original languageEnglish
Title of host publication39th IEEE Photovoltaic Specialists Conference, PVSC 2013
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages330-332
Number of pages3
ISBN (Print)9781479932993
DOIs
Publication statusPublished - 2013 Jan 1
Event39th IEEE Photovoltaic Specialists Conference, PVSC 2013 - Tampa, FL, United States
Duration: 2013 Jun 162013 Jun 21

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
Period13/6/1613/6/21

Keywords

  • Germanium
  • Photovoltaic cells
  • Quantum dots
  • Semiconductor nanostructures
  • Silicon

ASJC Scopus subject areas

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

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  • Cite this

    Tayagaki, T., Hoshi, Y., Ooi, K., Kiguchi, T., & Usami, N. (2013). Effect of Ge/Si heterostructures on carrier extraction in Si solar cells with Ge quantum dots. In 39th IEEE Photovoltaic Specialists Conference, PVSC 2013 (pp. 330-332). [6744160] (Conference Record of the IEEE Photovoltaic Specialists Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2013.6744160