成果報告書詳細
管理番号20140000000292
タイトル*平成25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 三層協調界面構築による高効率・低コスト・量産型色素増感太陽電池の研究開発 (高効率・高耐久性電解質材料の研究開発)
公開日2014/12/27
報告書年度2013 - 2013
委託先名メルク株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Part 1. Electrolyte based on Cobalt (Co) complex redox couples
While the redox couple used in conventional electrolyte for dye-sensitized solar cells (DSSCs) was only iodine/iodide, alternative Co complex electrolytes to replace the iodine/iodide have been reported. In 2012, our measurement of the DSSC with using of Co complex electrolyte demonstrated 8.2% photoelectric conversion efficiency (PCE). In the last year, we also showed that Co complex electrolyte under heat stress test at 85 degrees Celsius by JIS B1 can be more durable than iodine/iodide electrolyte with identical solvent and other chemicals.
In this 2013 FY, we were motivated in improvement of PCE for practical DSSC usage. For this purpose, we have non-empirically predicted physical properties of the electrolyte with combination of a large numbers of chemicals and their composition by our computational chemistry system with COSMO-RS method. Test cells were fabricated using National Institute of Advanced Industrial Science and Technology (AIST) organic dye and Sumitomo Osaka Cement titania paste and measured under 1sun AM1.5.
From the calculation results of solvation energy of the AIST organic dye and Co complex salt into several organic media, newly developed counterions “A1”, “A2”, and “A3” of the Co complex cation were found to be suitable for a DSSC electrolyte. Moreover, ionic liquid and acetonitrile were suitable for the DSSC electrolyte solvents.
From the results of degree of dissociation of Co complex salts at 0.50 molal acetonitrile solution, which is almost same concentration in a general DSSC electrolyte, that of the complex with the newly developed counterions “A1”, “A2”, and “A3” were estimated to be relatively larger value. And the tendency of the degree was similar to that of PCE of actual test cells with the same concentration of complex salt in the electrolyte solution.
In the standard solar cell measurement by AIST, our modified DSSC attained 8.40% PCE.
Part 2. Electrolyte based on nonvolatile ionic liquid
We have been focusing on nonvolatile ionic liquid based electrolyte in order to pursue high durability and low module processing cost at the same time. In the last year, it was suggested by the non-empirical simulation that small volume of water in various electrolyte mixtures strongly affected a degradation of DSSC.
In this 2013 FY, we were motivated in the improvement of durability for practical DSSC usage. For this purpose, we have developed new additives into the electrolyte mixture. In our heat stress test at 85 degrees Celsius, relative value over 50% to initial PCE of the DSSC including the new additives in electrolyte kept for 2500 hrs, which is 5 times longer than that of the DSSC non-including the additive.
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