成果報告書詳細
管理番号20140000000299
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 有機薄膜太陽電池モジュール創製に関する研究開発 (材料・構造最適化技術の研究開発)
公開日2015/2/19
報告書年度2013 - 2013
委託先名国立大学法人京都大学
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1) Regarding the p-type semiconducting materials, a fluorinated analogue of PCDTBT (i.e., PCDTBT-F) was developed by replacing two hydrogen atoms on benzothiadiazole (BT) units with two fluorine atoms. An analogous polymer, PCBBBT-F with additional hexylthiophenes between the thiophene and carbazole of PCDTBT-F was also prepared to overcome the poor solubility of PCDTBT-F. A bulk heterojunction (BHJ)-polymer solar cell (PSC) that employed PCDTBT-F or PCBBBT-F as an electron donor and a fullerene derivative [70]PCBM as an electron acceptor yielded lower power conversion efficiencies of 1.29% and 1.98%, respectively, than that of PCDTBT (6.16%) due to the unfavorable film structures of PCDTBT-F:[70]PCBM resulted from the poor solubility and low molecular weight as well as low crystallinities and limited exciton lifetimes of the fluorinated polymers.

2) Fullerene derivatives have occupied a dominant position as n-type materials in OPV cells. The most straightforward approach to develop excellent n-type materials involves the synthesis and careful purification of new fullerene derivatives with different substituent from that of benchmark PCBM. We conducted purifications of new PCBM analogues, synthesized by the companies in the group, with the use of recycling HPLC equipped with Buckyprep column. Then, we created a table of the OPV performance concerning new PCBM analogues and shared the information within the group.
We also prepared novel skeletally-modified fullerenes based on original synthetic methods developed in our group. Although their OPV performances in combination with P3HT were low (<1%), we will try to improve the performance by optimizing the substituents as well as developing new synthetic methods.

3) Through collaborations with the consortium member companies, power conversion efficiency (PCE) of 9.56% has been achieved by the development of buffer layer and device structure as well as novel semi-conducting materials.Ordinal and reversed-type solar cells have been prepared and evaluated with various kinds of buffer layer using polymer-A from Sumitomo Chemical company as the p-type semiconductor material. For reversed structured cell, VOx buffer layer as HTL showed the best performance of 9.56%(Jsc=20.5mAcm-2,Voc=0.67V, ff0.691), wherease, for ordinal structured cells, TiOx layer used as the electron transfer layer still showed the highest performance among various kinds of ETL.

4) In organic solar cells (OSCs), device degradation is one of the crucial problems to be solved. In this study, we have investigated device degradation in bulk heterojunction OSCs by nuclear magnetic resonance (NMR) spectroscopy. From NMR experiments, we found following points; 1) side-chains of donor polymer and PC71BM degradation can be analyzed selectively by solution NMR, 2) PTB-7/PC71BM and SK-1/PC71BM systems are phase-separated after A-1 and A-2 cycle tests. In the future, we will attempt to reveal the material degradation and morphological change by a combination of solution NMR and solid-state NMR experiments.
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