成果報告書詳細
管理番号20120000000535
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 低炭素社会実現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2013/6/25
報告書年度2011 - 2011
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
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 1.1 研究開発の内容
有機有機薄膜太陽電池は、印刷法やスピンコート法など湿式法を駆使した製造ができるなど大きな特長を有する。高温、高真空などの高コスト要因プロセスが不要となるため、飛躍的な低コスト化が可能な将来の新規太陽電池として嘱目され、現在、米国、日本、欧州を中心に活発な研究開発が進められている。しかし、従来の無機太陽電池と比べて電変換効率がまだ5-6%程度と低く、また実用耐久性も改善途上であり、これらの課題が克服されれば、将来、種々の太陽電池群の中で有機薄膜太陽電池は、次世代低コスト太陽電池として重要な一翼を担うと期待される。
本研究開発は、高耐久化に関して、変換効率および耐久性に影響する因子を解明しつつ、高性能化が達成できる各種構成材料の開発やその最適な組み合わせを見出し、高効率と高耐久性を両立させた太陽電池セルの開発を目指す。さらに、これらの知見を発展させて、実用化形態の一つである高効率、高耐久を有する集積構造サブモジュールを開発するものである。
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-FY2011) FY2011 Annual Report
To improve the stability and the power conversion efficiency of organic thin-film solar cells, we have been focusing on the following three topics: 1) Understanding of influencing factors on stability. 2) Improvement of the device stability. 3) Improvement of the power conversion efficiency.1) Understanding of influencing factors on stability. We examined light soaking tests to clarify the effects of light intensity and ambient temperature. We confirmed that the decrease in performance showed linear dependence on the accumulated irradiance. The higher the ambient temperature, the larger the rate of decrease of device performance in early period, but the total amount of performance decrease stay constant and it do not depend on the temperature. We examined durability tests of the devices with low-band-gap polymers as an active layer, which are expecting higher performance than P3HT. We confirmed following results: The device showed that the amount of degradation is larger than typical P3HT based device; the decrease of device performance can be reduced by changing the hole transfer materials (HTL); by comparing the dark current before and after the accelerated irradiation test, we have noticed that series resistance (Rs) of the cell increased and we could successfully suppress the increase of Rs by applying appropriate HTL materials. 2) Improvement of the device stability. We have developed new electrode material which shows less than 10% decrease of device performance after the light soaking test of about 5000h continuous illumination. We applied the technology established by improvement studies on small cells to make sub-modules, and tested the durability of them. We confirmed that the performance degradation of modules are less than 10% after both tests of humidity (85℃85RH) for 2,000 hrs and light soaking for 4,000 hrs. From the correlation analysis between outside tests and light soaking tests, we found that the performance decrease by the light soaking tests is equal to the accumulated amount of the solar irradiance. 3) Improvement of device performance. To fabricate highly efficient sub-modules with monolithic interconnection, we examined the laser scribing system. We found that the performance of modules fabricated with laser scribing system drops extremely compared with mechanical scribing after heat treatment of encapsulation. We examined fabrication conditions and then could to fabricate modules without degradation after the heat treatment. We also can fabricate modules which has much larger area efficiency by laser scribing. And the laser scribed modules produce about 1.5 times larger efficiency than manually scribed modules (laser: 3.8%, manual: 2.4%).
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