1. Far-red Sensitive Squaraine Dyes with Extended π-Conjugation
Towards Anchoring Groups for Molecular Photovoltaics
Gururaj M. Shivashimpi, Naotaka Fujikawa, Gaurav Kapil, Yuhei Ogomi,
Shyam S. Pandey, Yoshihiro Yamaguchi and Shuzi Hayase
Graduate School of LSSE, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, 808- 0196, Fukuoka, Japan
Nippon Steel Chemical Company Limited, ,Nakabaru, Kitakyushu 804-8503,Japan
*E-mail: shyam@life.kyutech.ac.jp
Sensitizing
Dyes
Jsc
(mA/cm2)
Voc
(V)
Fill
Factor
Efficiency
(%)
SQ-3 8.04 0.59 0.66 3.14
SQ-23 10.43 0.55 0.66 3.85
SQ-89 12.06 0.59 0.63 4.51
 Novel symmetrical squaraine dyes with varying π-conjugation have been synthesized and characterized.
 Cyanoacrylate functionality leads not only to the red-shift in absorption spectrum but pronounced spectral broadening as well
as photon harvesting as compared to –COOH anchoring group.
 Enhancement of π-conjugation of main aromatic framework although leads to red-shift in the light absorption but prone to
increased dye aggregation leading to hampered photovoltaic performance.
Photovoltaic Performance
Conclusions
Photovoltaic Parameters
Sensitizing Dyes in This Work !
Energy Band Diagram
CB TiO2
I-
/I3
-