成果報告書詳細
管理番号20130000000532
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耐久性予測手法と高耐久性素子の開発)
公開日2014/5/17
報告書年度2012 - 2012
委託先名住友化学株式会社
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: Pioneering Next Generation Solar Cell Technologies and Industries via Multi-manufacturer Cooperation (Sub-theme: 14-1「Development of Prediction Method of the Stability of Organic Thin-film Solar Cell and Solar Cell with High Stability」in the theme of 「Fabrication of High Efficiency Organic Thin-film Solar Cell」) (FY2010-FY2013) FY2012 Annual Report (Sumitomo Chemical Co., Ltd.)

 It is crucial to establish methodologies for reliable acceleration tests which enable us to estimate the lifetime of organic thin-film solar cell (OPV) , because the degradation mechanism of OPV could be different from that of silicon solar cells, of which the stability tests have been established (JIS C 8917, JIS C 8938). For this purpose, we (Sumitomo Chemical) are focusing on fundamental analysis and development of materials and modules for OPV with high efficiency and durability. The final targets of our task are (1) to establish the conditions of the acceleration tests, that reflect the same degradation manner as outdoor exposure test and estimate the acceleration factors , (2) to reveal the degradation mechanism of OPV and draw up the guidelines for improvement of the stability (optimization of electrodes, peripheral materials, and fabrication processes), (3) to propose the device structure of OPV that is durable more than 5 years as a results of (1) and (2), and (4) to suggest standard conditions for stability tests.
 First of all in this year, we found that the degradation curve of the light soaking test for 1.5month (1,000hrs) simulate that of 1 year (10,000hrs) of the outdoor exposure test, which enables us to estimate the acceleration factor by 10 by using our original material (polymer A). We studied general versatilities of this acceleration test and acceleration factor by using commercially available materials (P3HT and PTB7) and our novel material polymer B. Although the acceleration test is still for a short time (500hrs), these materials show similar degradation profile as that of polymer A. The test is still ongoing.
 Regarding other tests such as oven test and dump heat test, our device showed very poor stability including quick decay (known as the catastrophic drop) that precludes estimation of acceleration factor. Such rapid degradation was due to vulnerability of encapsulation, the device layout has optimized and the getter material was applied. As a consequence, the stability of the devices in the oven test and the dump heat test improved dramatically and finally enabled us to compare these acceleration tests with outdoor exposure test and to estimate the acceleration factor.
 The active layer materials showed no change by UV-Vis spectra even after full degradation, so the peripheral materials such as electrode and buffer layer were thought to be the key in order to extend the lifetime of the OPV devices. As an enhancement of stability by optimization of materials, we achieved very high heat stability with a novel inorganic oxide buffer layer.
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