Two-step photon up-conversion solar cells

• 朝日, 重雄

• Teranishi, Haruyuki

• Kusaki, Kazuki

• 海津, 利行

• 喜多, 隆

抄録

Reducing the transmission loss for below-gap photons is a straightforward way to break the limit of the energy-conversion efficiency of solar cells (SCs). The up-conversion of below-gap photons is very promising for generating additional photocurrent. Here we propose a two-step photon up-conversion SC with a hetero-interface comprising different bandgaps of Al 0.3 Ga 0.7 As and GaAs. The below-gap photons for Al 0.3 Ga 0.7 As excite GaAs and generate electrons at the hetero-interface. The accumulated electrons at the hetero-interface are pumped upwards into the Al 0.3 Ga 0.7 As barrier by below-gap photons for GaAs. Efficient two-step photon up-conversion is achieved by introducing InAs quantum dots at the hetero-interface. We observe not only a dramatic increase in the additional photocurrent, which exceeds the reported values by approximately two orders of magnitude, but also an increase in the photovoltage. These results suggest that the two-step photon up-conversion SC has a high potential for implementation in the next-generation high-efficiency SCs.

収録刊行物

• Nature Communications

  Nature Communications 8 14962-14962, 2017-04-06

  Nature Publishing Group

キーワード

• General Physics and Astronomy
• General Biochemistry, Genetics and Molecular Biology
• General Chemistry
• Multidisciplinary

詳細情報

• CRID: 1050294045370839296
• NII論文ID: 120006220826
• DOI: 10.1038/ncomms14962
• ISSN: 20411723
• HANDLE: 20.500.14094/90003921
• Web Site: https://www.nature.com/articles/ncomms14962.pdf
• Web Site: https://www.nature.com/articles/ncomms14962
• Web Site: http://www.nature.com/doifinder/10.1038/ncomms14962
• 本文言語コード: en
• 資料種別: journal article
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