電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
<電子物性・デバイス>
P3HTの臭素化によるπ共役長の短縮とP3HT:PCBMバルクヘテロ太陽電池の光電変換特性との相関
義富 卓也高田 謙谷合 伯斗安東 秀峰松本 浩一田中 仙君
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2018 年 138 巻 11 号 p. 1298-1304

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The conjugated system of polymer has an important role on the photovoltaic properties of a polymer bulk heterojunction (BHJ) solar cell. In this work, we focused on the impact of π-conjugation length of poly(3-hexylthiophene) (P3HT) on the power conversion efficiency of P3HT:phenyl-C61-butyric-acid methyl ester (PCBM) BHJ solar cell. The π-conjugation length of P3HT is systematically controlled through partial bromination at the 4-position of thiophene ring, which elucidated the correlation between the degree of P3HT bromination and the photovoltaic properties of Br-P3HT:PCBM BHJ solar cells. The energy conversion efficiency of the unbrominated (pristine) P3HT:PCBM solar cell is 2.3%, whereas that of Br-P3HT:PCBM solar cell with approximately 7% bromination falls to 1.4%. The present results suggest that the π-conjugation length of about 14 thiophene rings is insufficient for achieving efficient charge transport.

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