成果報告書詳細
管理番号20140000000735
タイトル*平成25年度中間年報 太陽エネルギー技術研究開発 革新的太陽光発電技術研究開発(革新型太陽電池国際研究拠点整備事業)高効率集光型太陽電池セル、モジュール及びシステムの開発 (日EU 共同開発) 集光型太陽電池用量子・ナノ構造の創製及び評価解析技術の開発 (WP2)
公開日2015/1/31
報告書年度2013 - 2013
委託先名国立大学法人東京大学先端科学技術研究センター
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Title:R & D on Innovative Solar Cells (International Research Center for Innovative Solar Cell Program) “Ultra-high efficiency concentration photovoltaics (CPV) cells, modules and systems (WP 2: Novel device technologies and quantum nanostructures for CPV)” (FY2011-FY2014) FY2013 Annual Report

(1) A novel 4-junction cell structure for the achievement of over 50% efficiency was discussed. The structure contains quantum wells with the absorption edge at 1.15 eV. The stepped potential superlattice structure was optimized successfully and the absorption edge was extended from 1.2 to 1.15 eV with a relatively small difference between the absorption edge energy and open circuit voltage, which is a common merit of quantum well cells. At the same time, the growth on 6-degree-off substrates, which is mandatory for the use of Ge substrate, was investigated so that the corrugation of quantum well thickness was eliminated.
(2) The second step intraband transitions of two-step photon absorption processes in a multi-stacked quantum dot solar cell were spectrally resolved for the first time by monitoring mid-infrared modulation of photocurrent at low temperature.
(3) State-filling-dependent intraband carrier dynamics in InAs/GaAs self-assembled quantum dots was studied by using two-photon excitation spectroscopy. We analyzed the observed state-filling-dependent intraband carrier dynamics by detailed modelling of carrier excitation and relaxation processes in which the two-photon absorption for the interband transition, Pauli blocking, and saturable absorption for the intraband transition are considered. Furthermore, we studied the fundamentals of photo-carrier dynamics in the two-step two-photon process, which influences the conversion efficiency.
(4) The production of evaluation system was performed and installed at the University of Tokyo for reliable characterization of CPV MJ tandem cells and quantum nanostructured cells. The spectral response is measurable over a wide spectral range from 300 to 2500nm. The I-V curves and mapping of laser scanned current (LBIC) generation can also be obtained for each individual subcells in MJ cells.
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