Control of macroscopic absorption coefficient of multicrystalline SiGe by microscopic compositional distribution

Noritaka Usami, Kozo Fujiwara, Toru Ujihara, Gen Sazaki, Hiroyuki Yaguchi, Yoshihiro Murakami, Kazuo Nakajima

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We report on the growth and optical characterizations of multicrystalline SiGe (mc-SiGe) with microscopic compositional distribution for solar cell applications. Mc-SiGe was grown by a simple technique based on the casting method. The compositional distribution and solidification structure of mc-SiGe were found to be strongly dependent on the cooling rate, suggesting that they can be controlled by the growth parameters. Spatial variation of the extinction coefficient, corresponding to the microscopic compositional distribution, was revealed by spectroscopic ellipsometry, and macroscopic optical properties were found to be controlled by the microscopic compositional distribution. The advantage of mc-SiGe was further revealed by the increased absorption in the lower energies compared with uniform SiGe with almost the same average composition.

Original languageEnglish
Pages (from-to)L37-L39
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number1 A/B
Publication statusPublished - 2002 Jan 15

Keywords

  • Microscopic compositional distribution
  • Multicrystalline SiGe
  • Solar cells

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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