ナノ構造体・結晶シリコン融合太陽電池(<特集>ナノ・ヘテロ構造を利用した太陽電池)

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タイトル別名
  • Integration of Nanostructures with Crystalline Silicon Solar Cells(<Special Issue>Novel Solar Cells Utilizing Nano- and Hetero-Structure)
  • ナノ構造体・結晶シリコン融合太陽電池
  • ナノ コウゾウタイ ・ ケッショウ シリコン ユウゴウ タイヨウ デンチ

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Photonic nanostructures coupled with Ge quantum dots (QDs) are integrated with crystalline Si solar cells for improvement of light trapping, photon absorption in nearinfrared wavelength, and carrier recombination suppression due to spatial separation of excited carriers. We demonstrate that the photonic nanostructures coupled with Ge QD multilayers can be fabricated by combination of a crystal growth technique and a maskless wet etching process. The geometry in the photonic nanostructures can be tuned by changing structural parameters in Ge QD multilayers and a kind of etchant. We found that external quantum efficiency in the entire wavelength is enhanced for a solar cell with a photonic nanostructure coupled with a Ge QD multilayer compared with a crystalline Si solar cell. It is demonstrated that a solar cell with photonic nanostructures formed by maskless wet etching process has a high potential for enhancement of solar cell properties.

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