Effect of auxiliary donors and position of benzothiadiazole on the optical and photovoltaic properties of dithieno[3,2-b:2′,3′-d]pyrrole-based sensitizers

Sunil Kumar, K. R. Justin Thomas*, Chun Ting Li, Miao Syuan Fan, Kuo Chuan Ho

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

Organic dyes used as sensitizers in dye-sensitized solar cells offer endless opportunities for modulation of cell efficiency through structural diversifications. Despite the countless number of dyes developed, structure-property analysis by varying chromophores and their topology in dyes is useful to formulate design principles. Herein, we report six new organic dyes featuring dithienopyrrole (DTP), benzothiadiazole (BTD) and cyanoacrylic acid units. The effect of auxiliary donors such as triphenylamine or diphenylaminofluorene and the position of benzothiadiazole on the optical and photovoltaic properties were evaluated by appropriate design of dyes. Incorporation of additional donor enhanced the spectral response of the dyes by elongating the conjugation length and supplementing the donor-acceptor interaction. Moving the BTD unit from the position between DTP and acceptor (D-D-A-π-A) to a position between the auxiliary donor and DTP (D-A-D-A) altered the absorption as well as electrochemical properties. Theoretical calculations revealed that the later molecular configuration ensures sufficient overlap of HOMO and LUMO and facilitate the charge transfer propensity from arylamine donor to acceptor which is beneficial for light harvesting. Among the dyes, a D-A-D-A dye possessing triphenylamine exhibited highest power conversion efficiency (η = 7.57%). The structure-property relationship is supported by electron transfer kinetics elucidated by electrochemical impedance spectroscopic studies. The best performing dye displayed high charge recombination and sufficiently low charge transfer resistance in the device.

原文英語
頁(從 - 到)539-547
頁數9
期刊Solar Energy
208
DOIs
出版狀態已發佈 - 2020 9月 15
對外發佈

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 材料科學(全部)

指紋

深入研究「Effect of auxiliary donors and position of benzothiadiazole on the optical and photovoltaic properties of dithieno[3,2-b:2′,3′-d]pyrrole-based sensitizers」主題。共同形成了獨特的指紋。

引用此