Development of new materials for solar cells in Nagoya Institute of Technology

Takashi Jimbo, Tetsuo Soga, Yasuhiko Hayashi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Solar cells with high efficiency and low price have long been desired, however, the commercially available solar cells are still expensive and the efficiencies of them are not high enough yet. A tandem solar cell was fabricated to develop a high-efficiency solar cell, and amorphous carbon solar cells were fabricated to develop a low-price solar cell. An AlGaAs/Si tandem solar cell was successfully fabricated by heteroepitaxial growth of AlGaAs on Si substrate. At first, a p-n junction was formed in Si substrate by the impurity diffusion method. Then, an AlGaAs p-n junction was grown by MOCVD. Since the AlGaAs p-n junction has a graded band gap emitter, the photo-excited minority carriers can be collected efficiently. The energy conversion efficiency of AlGaAs/Si tandem solar cell was 21.4% (AM0) in spite of large lattice mismatch and difference in thermal expansion coefficients between AlGaAs and Si. Solar cells were fabricated by using amorphous carbon films deposited by Ion Beam Sputtering and Pulse Laser Deposition (PLD). The highest efficiency of 1.82% (AM0) was attained with a-C(IBS)/p-C(pyrolysis)/p-Si structure. Solar cells using a-C:H were also fabricated by PLD and Plasma CVD, and the efficiencies of them were 2.1% (AM1.5) and 0.04% (AM0), respectively. Other research activities on solar cells in Nagoya Institute of Technology are briefly mentioned.

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalScience and Technology of Advanced Materials
Volume6
Issue number1
DOIs
Publication statusPublished - Jan 2005
Externally publishedYes

Fingerprint

Solar cells
Amorphous carbon
Laser pulses
Plasma CVD
Lattice mismatch
Carbon films
Metallorganic chemical vapor deposition
Amorphous films
Substrates
Energy conversion
Epitaxial growth
Ion beams
Conversion efficiency
Thermal expansion
Sputtering
Energy gap
Pyrolysis
Impurities

Keywords

  • AlGaAs/Si
  • Amorphous carbon
  • Heteroepitaxy
  • Solar cell

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Development of new materials for solar cells in Nagoya Institute of Technology. / Jimbo, Takashi; Soga, Tetsuo; Hayashi, Yasuhiko.

In: Science and Technology of Advanced Materials, Vol. 6, No. 1, 01.2005, p. 27-33.

Research output: Contribution to journalArticle

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