Molecular engineering of cyclopentadithiophene-containing organic dyes for dye-sensitized solar cell: Experimental results vs theoretical calculation

Chun Guey Wu, Wei Tsung Shieh, Chin Sheng Yang, Chun Jui Tan, Chiao Hsin Chang, Su Chien Chen, Chia Yin Wu, Hui Hsu Gavin Tsai

研究成果: 雜誌貢獻期刊論文同行評審

15 引文 斯高帕斯(Scopus)

摘要

Four donor-conjugated spacer-acceptor (D-π-A) organic dyes containing cyclopentadithiophene unit as a part of the conjugated spacer are prepared and studied to investigate the effects of the conjugated spacer and donor on the short-circuit current and conversion efficiency of the corresponding DSSCs. Theoretical calculations reveal that a shorter conjugated spacer or a stronger donor leads to more effective electron injection upon photo excitation. Therefore, D-π-A typed dye with longer conjugated spacer may have higher absorption coefficient and longer λmax. Nevertheless, it may also have lower effective electron injection upon photo excitation. Calculation data also show that cyclopentadithiophene although is a good moiety for extending the conjugation length of the organic dyes, it also acts as an electron sink, decreasing the effective electron injection. The transition probability calculated with the electron density difference analyses combining with the experimental absorption and photovoltaic performance data provides a useful protocol for designing organic photosensitizers for DSSCs at the electronic and structural levels.

原文???core.languages.en_GB???
頁(從 - 到)1091-1100
頁數10
期刊Dyes and Pigments
99
發行號3
DOIs
出版狀態已出版 - 2013

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