| 研究実績の概要 |
1. Effects of thermal-annealing and processing-additive treatment in organic solar cells (OSCs): Effects of thermal-annealing and processing-additive treatment on crystallization-induced phase separation and photovoltaic performance in bulk heterojunction (BHJ) OSCs utilizing non-peripherally substituted octapentyl tetrabenzotriazaporphyrin (C5TBTAPH2) mixed in 1-(3-methoxycarbonyl)propyl-1-phenyl-(6,6)C71 (PCBM) were reported. By using either thermal-annealing or processing-additive treatment, the C5TBTAPH2-crystallite sizes in the BHJ films were enlarged and the power conversion efficiencies (PCEs) were increased due to improvement of the crystallization-induced phase separation. However, the optimum PCE of the processing-additive treated devices was higher than those PCE of devices treated by thermal annealing. These results were discussed by taking the thermal properties and molecular aggregation of PCBM into consideration.
2. All-solution processalbe tandem cell using mesogenic phthalocyanine: The photovoltaic performance of BHJ OSCs using C6TBTAPH2 limits due to the weak absorption at around 500 nm. I have fabricated the tandem solar cell with all-solution processed multilayer structure utilizing a conventional structure composed of C6TBTAPH2 and poly(3-hexylthiophene) (P3HT). The P3HT single cell give a maximum the external quantum efficiency at 500 nm, and the C6TBTAPH2 single cell has two predominant peaks at 720 and 350 nm. The tandem solar cells with stacking of the two composite thin films cover the all visible spectral range and the PCE of 3.2% was achieved.
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