Fused heterocycles possessing novel metal-free organic dyes for dye-sensitized solar cells
Journal
Tetrahedron
Journal Volume
73
Journal Issue
3
Pages
278-289
Date Issued
2017
Author(s)
Abstract
A series of fused heterocycles possessing novel metal free organic dyes viz., CPTAA-1, CPTAA-2, TCPTAA-1 and TCPTAA-2 has been designed and synthesized as sensitizers for dye-sensitized solar cells (DSSCs). Explorations on the relationship between the dye structures, photophysical/electrochemical properties, and DSSC performances have been described. The dyes CPTAA-1 and CPTAA-2 possess superior absorption maxima both in dichloromethane and adsorbed on TiO2compared to TCPTAA-1 and TCPTAA-2. All the dyes display more positive ground state oxidation potential than the redox potential of I?/I3 ?electrolyte and more negative excited state oxidation potential than the conduction band edge of the semiconductor. Incorporation of additional carbazole scaffolds in CPTAA-1 and CPTAA-2 culminated with reduced photocurrent density, probably, due to poor interaction between the bulky dyes (TCPTAA-1 and TCPTAA-2) and semiconductor. Of the DSSCs fabricated, the one with CPTAA-1 displayed the highest incident photon-to-current conversion efficiency (IPCE). The DSSC device with CPTAA-1 exhibited high power conversion efficiency (£b?=?4.38?¡Ó?0.3%) compared to the others with an open circuit voltage (VOC) of 648?¡Ó?0.4?mV, short circuit current density (JSC) of 10.03?¡Ó?0.2?mA?cm?2, and fill factor (ff) of 0.66?¡Ó?0.002 under simulated AM 1.5G irradiation (100?mW/cm?2). ? 2016 Elsevier Ltd
Subjects
Carbazole
Dye-sensitized solar cells
Intramolecular charge transfer
Metal-free dyes
Phenothiazine
Photovoltaic properties
SDGs
Other Subjects
dichloromethane; dye; titanium dioxide; alkylation; Article; current density; dye sensitized solar cell; electrochemical impedance spectroscopy; electrochemistry; electron transport; electronics; formylation; Friedel Crafts reaction; illumination; oxidation reduction potential; priority journal; semiconductor; short circuit current; thermodynamics; Vilsmeier Haack reaction
Type
journal article