Growth and properties of SiGe multicrystals with microscopic compositional distribution and their applications for high-efficiency solar cells

Kazuo Nakajima, Kozo Fujiwara, Wugen Pan, Noritaka Usami, Toetsu Shishido

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

The use of SiGe binary multicrystals with microscopic compositional distribution was propose as a solution to obtain new SiGe solar cells with higher conversion efficiency using the casting method. The SiGe multicrystals have many Ge-rich regions in Si-rich matrix, and this structure causes large increase of the photo-current for such SiGe multicrystal solar cells in the longer-wavelength region comparing to the Si multicrystal solar cells. The microscopic compositional distribution in SiGe multicrystals and wavelength dependence of absorption coefficient can be freely controlled. SiGe multicrystal solar cells with microscopic compositional distribution have higher efficiency than Si multicrystal solar cells mainly due to the increase of the total photo-current by a factor of 1.2, and the smaller decrease of open-circuit voltage Voc within the average Ge composition of lower than 5%. The efficiency of SiGe multicrystal solar cells has a maximum value at the average Ge composition around 5%.

Original languageEnglish
Pages (from-to)e455-e460
JournalJournal of Crystal Growth
Volume275
Issue number1-2
DOIs
Publication statusPublished - 2005 Feb 15

Keywords

  • A1. Crystal structure
  • A1. Phase diagrams
  • A2. Bridgman technique
  • B1. Growth from melt
  • B2. Semiconducing silicon compounds
  • B3. Solar cells

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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