成果報告書詳細
管理番号20110000000649
タイトル*平成22年度中間年報 新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)高度秩序構造を有する薄膜多接合太陽電池の研究開発
公開日2011/8/5
報告書年度2010 - 2010
委託先名独立行政法人産業技術総合研究所
プロジェクト番号P07015
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 40%を超える高効率のために最適な複数のバンドギャップを有する高度秩序薄膜材料を新たに設計・創製する。それら新材料をシリコン系3接合および化合物系4接合デバイスに適用し、波長選択型導電層を介して2端子メカニカルスタック太陽電池を形成する。また光マネジメント技術、多重エキシトン生成、二光子利用技術などの新原理検証についても検討を行う。
英文要約Title: Exploring multi-junction thin-film solar cells with highly ordered structures (FY2008-2012) FY2010 Annual Report
In order to obtain efficiency over 40%, we have studied highly ordered novel materials for optimized band gap and 3-stacked silicon-based or 4-stacked compound-semiconductor-based multi-junction solar cells. As highly ordered materials, many types of novel materials and structure, such as quantum dots (QDs), nanostructure (silicon, carbon), single-crystalline organic, etc, are studied. To achieve higher efficiency, the light management technologies including photonic structure, utilization of plasmon effect are also the research themes. Novel mechanical stacking technology is a must for fabricate two-terminal solar cell structure. Followings are some of the major results of research themes carried out in FY2010. 1-1: Development of highly oriented planar polysilane: Linear and network polysilanes containing anthryl groups were synthesized with advances in synthetic techniques. The marked changes in absorption spectra by heating at 500 oC under vacuum were found. Their dependence on the reduced pressure during heating was observed and the effect of UV irradiation before heating was also investigated. Multilayer solar cells fabricated using PCBM or C60 on polysilanes thin films prepared by heat treatments show high open circuit voltage (VOC). 2-3: Development advanced wide-gap solar cells: 400-stack InGaAs quantum dots (QDs) structure was successfully fabricated by MBE. The short circuit current density of the solar cells increased as the number of InGaAs QD layers increased up to 150 with 12nm-thick barrier layer. Existence of the tunnel current through the miniband of the multilayered QD superlattice was confirmed for the first time by the measurements of quantum efficiency at low temperature. 3-2-A: Study on novel-concept solar cells using single-crystalline organic semiconductors: Single crystalline p-type organic semiconductors, rubrene and tetracene, were fabricated by a sublimation method. Exciton diffusion length of single crystalline tetracene was 176 nm, which was one order of magnitude larger than that of poly-crystalline tetracene. Fission phenomenon from singlet exciton to triplet was observed for the first time in a single crystalline rubrene. 4-2: Development of advanced light management: A new type of light-scattering substrate was developed. The key issues of this substrate are (a) a large refractive index contrast in plane for enhancing light scattering, and (b) a flattened surface suited for mechanical stacking. The substrate developed has a diffraction grating structure composed of ZnO and hydrogenated amorphous Si with a Ag reflector. When it was applied to a 1-micron-thick microcrystalline Si solar cell, the substrate enhanced the quantum efficiency in the near-infrared region drastically by a factor of two in comparison with a cell with the conventional flat substrate.
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