成果報告書詳細
管理番号20130000000534
タイトル*平成24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 高効率有機薄膜太陽電池の作製(有機薄膜太陽電池のエネルギー変換効率向上および高耐久化に関する研究開発)
公開日2014/5/17
報告書年度2012 - 2012
委託先名JX日鉱日石エネルギー株式会社
プロジェクト番号P09026
部署名新エネルギー部
和文要約
英文要約Title: Funding Program for World-Leading Innovative R&D on Science and Technology / Development of organic photovoltaics toward a low-carbon society / Research and Development of Organic Thin-Film Solar Cells and their Organic Semiconductors
(FY2010-FY2013) FY2012 Annual Report
                      JX NIPPON OIL & ENERGY LIMITED

 To improve the stability and the power conversion efficiency of organic thin-film solar cell sub-modules, we have been focusing on the following two topics: 1) Improvement of the device stability. 2) Improvement of the power conversion efficiency of sub-modules. 1) Improvement of the device stability. From the light soaking test which have been tested from last year, we confirmed that the performance decrease of P3HT based glass substrate devices is saturated after initial decrease of about 7% (60h). And they showed only about 4% decrease of device performance after more than 10,000h light soaking test. From the analysis of outdoor tests and in-door accelerated test, we found that the performance decrease have linear dependence on the accumulated amount of irradiance, and the lifetimes of P3HT based glass substrate devices is expected to be greater than 10 years from accelerated test results. Also, the results of thermal stability test of low-band-gap polymer based glass substrate devices, which have typically lower thermal stability than P3HT based devices, suggested that the fullerene derivatives used with low-band-gap polymer based devices have an influence on lower stability. Then we examined the combination of low-band-gap polymers and confirmed that thermal stability is improved by changing fullerene derivatives. 2) Improvement of the power conversion efficiency of sub-modules. We developed an OPV sub-module using glass substrate with 4.2% conversion efficiency and a high aperture ratio of 98.1%. To achieve high aperture ratio of the module, very fine (40 micrometer width) laser pattering processes were utilized. We also applied our laser pattering methods to prepare OPV sub-module using flexible substrate. We found damage to the underlying layer is increased in all pattering processes (ITO, active layer, metal) under the same laser pattering conditions as for the glass substrate module. In order to improve conversion efficiency of flexible sub-module, we conducted further optimization of laser pattering conditions for the flexible substrate to minimize the damage to the underlying layer and ensure insulation between adjacent cells. With optimum laser patterning conditions, we could prepare a flexible OPV sub-module with efficiency of about 2.8%. However, larger variation in the performance was observed for the flexible sub-modules compared to glass based sub-modules. We analyzed cause of performance variations by using electroluminescence measurements. As a result, there is a good correlation between a number of leakage emission defects and device performance. We confirmed conversion efficiency of flexible devices shows almost equal to that of glass devices if the number of defect is as low as glass devices.
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