成果報告書詳細
管理番号20120000000523
タイトル*平成23年度中間年報 最先端研究開発支援プログラム/低炭素社会に資する有機系太陽電池の開発/認証データ計測センター機能構築と要素技術の開発・評価
公開日2013/1/18
報告書年度2011 - 2011
委託先名財団法人神奈川科学技術アカデミー
プロジェクト番号P09026
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 本サブテーマは、プログラム参加機関あるいはそれ以外の機関からの有機系太陽電池の評価業務を神奈川科学技術アカデミーに新規に確立することを目的としている。
小テーマ「2-1有機系太陽電池性能評価方法の検討および素材等の基本特性評価の実施」においては、有機系太陽電池の性能評価の精度を上げるため、各種校正機器(高精度分光放射照度測定装置、照度分布測定装置)や冷却試料台などを導入した。プログラム参画機関からもサンプルの提供を受け、(財)光産業技術振興協会(OITDA)より提案されている「色素増感太陽電池の性能評価方法(OITDA PV01-2009)」の各項目について測定を行い、その結果を整理し、課題の把握に努めた。色素増感太陽電池(DSC)に関し、I-V測定における掃引時間の検討、温度依存性及び光量依存性の検証等を行った。またIPCE測定における単色光光量の依存性の直線性や、IPCE測定に異なる手法を用いた場合の算出されるJsc値の妥当性の検討を行った。2012年3月に行われた「計測・標準化分科会」において、DSC性能評価法の素案を提案した。
英文要約Funding Program for World-Leading Innovative R&D on Science and Technology / Development of Organic Photovoltaics toward a Low-Carbon Society /
Developments of Analysis & Evaluation Standards for the Performance and Basic Material Characteristics of Organic Photovoltaics (OPV) (FY2010-FY2011)
FY2011 Annual Report
Our aim is to establish new worldwide reliable evaluation methods for the performance standards of the organic photovoltaic (OPVs) as well as dye-sensitized solar cells (DSCs). The evaluation study has been conducted by using the Kanagawa Academy of Science & Technology (KAST) facilities under the supervision of Prof. Akira Fujishima, the President of Tokyo University of Science (TUS).
A number of the calibration devices including a high-precision spectroradiometer, an instrument to assess non-uniformity of the irradiance, and so on, equipped with a sample holder controlled by a temperature regulator were employed in order to improve accuracy and to reduce uncertainty in measurement. Photovoltaic samples to be analyzed were kindly supplied by the photovoltaic cell makers, the members of the present project, “Development of Organic Photovoltaics toward a Low-Carbon Society”.
An evaluation procedure, “Evaluation method of performance for dye-sensitized solar devices PV01-2009)”, proposed by Optoelectronics Industry and Technology Development Association(OITDA) in 2009, is, in principle, employed to refer to the issues on the DSC performance measurements.
A scanning time for the I-V plot of DSC is carefully searched to obtain a satisfactory relationship between photocurrent and irradiance at a constant temperature. On measuring IPCE by a DC method, a linear output photocurrent against the irradiance of monochromatic light was observed in the range of 0.05mW/cm2 to 4mW/cm2 at a wavelength among 400-800nm. On the other hand, the output photocurrents tend to decrease against intensities of bias white light by an AC method. The short-cut photocurrents (Jsc’s) obtained by I-V and IPCE measurements were compared and found to be in the almost same tendency within a few percent, and Jsc’s by a AC method was more close to that from I-V plot, in compared with that of a DC method; i.e., IPCE (by a DC method) > I-V > IPCE (by an AC method).
Since both DSCs and OPVs prepared by various manufacturers have their own spectral responses depending on the different kinds of the elemental materials, e.g., sensitizer dye, of the cells, it is difficult to use the corresponding commercially available reference cells with little spectral mismatch for the cells to be analyzed. Then, a number of appropriate reference cells are tried in our hands to make or devise the working cells with suitable optical filters easy to be exchanged. Such a reference cell was ordered in combination with two kinds of filters, which has a spectral response resembling with that of DSC to be analyzed.
These above mentioned evaluation method for the international standards of DSCs and OPVs will be proposed by our hands in the coming these two years. We, KAST, also present basic researches for constructing novel DSCs in a cooperation with TUS, where newer DSCs were fabricated and assembled by using elemental components, the performance and efficiency of which were evaluated. Thus, DSC consisting of “porous TiO2 particle layers” as a semiconductor exhibited 4~5% efficiencies, and also DSC containing Au clusters could be prepared which is active in the near IR region.
Moreover, a new analysis system to measure the carrier lifetime of OPV has been developed by a non-contact measurement by making use of the “Microwave Photo Conductivity Decay (μ-PCD) method”. In addition, the following new findings are noted, that is, a monolithic TiO2 film/ particle was tried to modify an anode of DSC, to increase the incident light absorption by light scattering in the microstructure.
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