ドナー材料に新規導電性高分子材料を用いた有機薄膜太陽電池の特性評価と素子構造の検討

摘要

In recent years, the low cost, flexibility, low weight, and simple processability of the organic solar cell (OSC) have attracted many researchers and industrial society to next generation solar cell. Since the OSC due to the bulk-heterojunction fabricated by semiconductor polymer was reported, the power conversion efficiency (PCE) have achieved over 5%.rnIn this study, as donor, "poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,l,3-benzothiadiazole-4,7 -diyl-2,5-thiophenediyl](PCDTBT)", "poly[(4,4-dioctyldithieno(3,2-b:2',3'-d)silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7 -diyl](PSBTBT)"or "poly[2,l,3-benzothiadiazole-4,7-diyl[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,l-b:3,4-b']dithiophene-2,6 -diyl]](PCPDTBT)" were adopted. As accepter, "[6,6]-phenyl-C71-butyric acid methyl ester(PC71BM)" was adopted. The performance of the OSC made by these blend films were evaluated. Moreover, to improve of PCE, the effect of the inverted type OSC was investigated.%狭いバンドギャップ，深いHOMO準位を有するP型高分子材料を有機薄膜太陽電池の活性層に用いる事で，光吸収波長領域が広がり，素子の開放電圧が向上するという結果を得た。これにより，PCDTBT：PC71BMを活性層に用いた有機薄膜太陽電池素子は2.24％の電力変換効率を示した。また，この活性層を用いた逆型有機薄膜太陽電池の作製に成功した。今後はさらなる効率改善とともに，逆型素子の耐久性についても評価検討していく。