非発光再結合検出による量子ナノ構造太陽電池材料評価(<特集>ナノ・ヘテロ構造を利用した太陽電池)

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  • Non-radiative Investigation of Quantum Well Solar Cell Materials(<Special Issue>Novel Solar Cells Utilizing Nano- and Hetero-Structure)
  • 非発光再結合検出による量子ナノ構造太陽電池材料評価
  • ヒハッコウ サイケツゴウ ケンシュツ ニ ヨル リョウシ ナノ コウゾウ タイヨウ デンチ ザイリョウ ヒョウカ

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Inserting quantum wells (QWs) into GaAs p-i-n solar cells could be a potential solution for the beyond the Shockley-Queisser limit. This is because the QWs can extend the absorption region and enhance the short-circuit current. However, they function as the recombination center leading to degradation in open-circuit voltage. We then evaluate the carrier behaviors by detecting the non-radiative recombination utilizing the piezoelectric photothermal (PPT) technique. The PPT spectra were clearly decomposed into excitonic and inter-subband transitions. From the temperature dependencies of radiative and nonradiative recombination and carrier escape from the well, we estimated the activation energies for non-radiative recombination and thermally carrier escape. The usefulness of the PPT methodology for investigating the QWs-embedded solar cells was clearly demonstrated.

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