Aggregation induced light harvesting of molecularly engineered D-A-pi-A carbazole dyes for dye-sensitized solar cells

Hemavathi, B and Jayadev, V and Pradhan, Sourava C. and Gokul, G and Jagadish, Kusuma and Chandrashekara, GK and Ramamurthy, Praveen C and Pai, Ranjith Krishna and Unni, Narayanan KN and Ahipa, TN and Soman, Suraj and Balakrishna, Geetha R (2018) Aggregation induced light harvesting of molecularly engineered D-A-pi-A carbazole dyes for dye-sensitized solar cells. In: SOLAR ENERGY, 174 . pp. 1085-1096.

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Abstract

Novel class of metal free organic dyes (CCTh and CCBz) with D-A-pi-A configuration, having carbazole as donor and 3-cyanopyridine as auxiliary acceptor replacing conventional benzannulated heterocycles along with variable pi-linkers were synthesized and used in dye-sensitized solar cells (DSSCs). Both the dyes are having cyanoacrylic acid as the anchoring group with thiophene (CCTh) and phenylene (CCBz) as pi-linkers. The photophysical, electrochemical, theoretical and photovoltaic properties of the dyes were investigated in detail. The absorption spectra of dyes on TiO2 showed broader absorption band for CCTh in comparison to the solution spectra indicating aggregation in solid state. The aggregation studies in varied THF/water fraction indicates J-aggregation for both the dyes. CCTh with thiophene linker showed broader absorption compared to CCBz, and the photovoltaic performance recorded for CCTh directly indicates better light harvesting ability corresponding to the red shifted J-aggregated states. Hence, solar cells fabricated with CCTh gave a power conversion efficiency of 3.39% and CCBz delivered an efficiency of 2.03% under full sun condition. A detailed investigation of device dynamics have been carried out employing charge extraction (CE), intensity-modulated photovoltage spectroscopy (IMVS) and open-circuit voltage decay (OCVD) measurements.

Item Type:	Journal Article
Publication:	SOLAR ENERGY
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright of this article belong to PERGAMON-ELSEVIER SCIENCE LTD
Keywords:	Cyanopyridine; Carbazole; D-A-pi-A; DSSC
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 Dec 2018 06:20
Last Modified:	28 Dec 2018 06:20
URI:	http://eprints.iisc.ac.in/id/eprint/61313

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