Synthesis and photovoltaic properties of organic small molecules containing triphenylamine and benzothiadiazole moieties with different terminal groups

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• 作者：Changwei Wang ; Zhencai Cao ; Bin Zhao ; Ping Shen ; Xunshan Liu ; Haohao Li ; Tianpei Shen ; Songting Tan ; ^{tanst2008@163.com}
• 关键词：Triphenylamine ; Benzothiadiazole ; Terminal groups ; Power conversion efficiency ; Bulk heterojunction solar cells ; Synthesis
• 刊名：Dyes and Pigments
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：98
• 期：3
• 页码：464-470
• 全文大小：1380 K

文摘

Three new organic small molecules (TPA-DTBT, TPA-DTBT-TH and TPA-DTBT-CAO) containing triphenylamine (TPA) and 4,7-bis(thiophen-2-yl)benzo[1,2,5]thiadiazole (DTBT) moieties with different terminal groups were designed and synthesized. Their thermal, photophysical, electrochemical and photovoltaic properties were investigated. The introduction of 2-ethylhexyl cyanoacetate and 2-tetradecyl thiophene as terminal groups extended molecular ¦Ð-conjugation length and broadened the absorption spectra. Three small molecules exhibit good solubility in common organic solvents, good film-forming ability, and thermal stability. Bulk heterojunction (BHJ) solar cells based on the blend of small molecule TPA-DTBT and PC₆₁BM showed a power conversion efficiency (¦Ç) of 1.85 % .