成果報告書詳細
管理番号20120000000577
タイトル平成23年度中間年報 太陽エネルギー技術研究開発 太陽光発電システム次世代高性能技術の開発 光電荷分離ゲルによる屋内用有機太陽電池の研究開発(光電荷分離ゲル材料の有機太陽電池デバイス化技術開発)
公開日2012/12/26
報告書年度2011-2011
委託先名パナソニック株式会社
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.光電荷分離ゲル有機太陽電池の変換効率向上
(1)D131よりも広い吸収波長領域を持つ色素を用いてた色素-n型分子の連結構造を検討した。長波長側に吸収端を持つインドリン系色素では、広く可視光を吸収する素子が作製できた。結果として、前記分子を用いたフラット集電極の素子において0.19μA/cm2の高い電流値を得た。
(2)多孔質集電極を用いた光電変換場の増大
多孔質電極の要素技術として塗布用法による厚みと空隙率との制御技術を開発した。空隙率を35%から80%に増大することで、孔径増大による多孔質電極中のメディエータの拡散が向上し、結果としてJscの向上が得られた。厚膜化による検討において、屋内用照度環境下(200lx、57.7μW/cm2)、Jsc=11.9μA/cm2を達成した。
2.蓄電機能付与 蓄電機能を発電材料と同材料であるn型/p型材料(約 100nm厚)を用いて素子を作製した。その容量は膜厚100nmにおいて、20μW/12cm2であり、ほぼ理論容量を達成した。今後、膜厚、電解液組成等の
最適化を進める。
英文要約Title: 「High performance PV generation system for the future / Development of organic photovoltaic cells based on photo-charge separation gel for indoor applications ( Development of device technology of organic photovoltaic cells based on photo-charge separation gel ) (FY2010-FY2012) FY2011 Annual Report
The results from 2011.4.1 to 2012.3.31 were summarized as the conversion efficiency improvement of the organic gel-based photovoltaic cells (1), and the development of the charge-storable photovoltaic cells (4).
1.The Conversion Efficiency Improvement of Organic Gel-based Photovoltaic Cells
(1) Effective Light Absorption and Photo-Induced Charge-Separation of n-Type Redox-Active Molecules Combined Dye Moiety
 N-type redox-active molecule combined a dye moiety which could absorb the wider visible region than that of D131 were synthesized. As the dye moiety, indoline derivatives were applied due to their high molar extinction efficiency in visible region. The photovoltaic cell with the indoline dye combined molecule exhibited higher current. And more, we accomplished 0.19 uA/cm2 in the flat electrode by optimizing the combination and the ratio of the n-type redox active moiety and the dye moiety.
(2) Increase of the surface area by applying the high porosity electrode
 We developed the elemental technology of a transparent conductive film and porous electrode film, and could control their thickness and porosity by the wet process. Increasing of the film porosity from 35 % to 85 %, a photovoltaic cell using the high porosity film improved its short circuit current density (Jsc) compared with a cell using lower porosity one, because of the effective mediator molecules’ diffusion through the larger pore. The modification of its thickness could give the Jsc improvement to 11.9 uA/cm2 in the interior light condition (ca. 200 lx).
4.Development of the charge-storable photovoltaic cells
 A charge-storable photovoltaic cell composed of the n- and p-type material layers (ca 100 nm each) was fabricated. From a charging- and discharging property of the cell, the output voltage was conformed of the redox potential gap between n- and p-type materials, and its capacity was 20 uW/12 cm2 which was almost equal to the calculation theoretical value. To increase the capacity of cells, we should optimize the thickness of each layer, electrolyte components, additives, and so on.
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