A New Series of EDOT Based Co-Sensitizers for Enhanced Efficiency of Cocktail DSSC: A Comparative Study of Two Different Anchoring Groups

Herein, we report the design and synthesis strategy of a new class of five EDOT based co-sensitizers (CSGR1-5) by introducing different donors (2,3,4-trimethoxypheny, 2,4-dibutoxyphenyl, and 2,4-difluorophenyl) and anchoring groups (rhodamine-3-acetic acid and cyanoacetic acid) systematically. The s...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2019-09, Vol.24 (19), p.3554
Main Authors: Koyyada, Ganesh, Kumar Chitumalla, Ramesh, Thogiti, Suresh, Kim, Jae Hong, Jang, Joonkyung, Chandrasekharam, Malapaka, Jung, Jae Hak
Format: Article
Language:English
Subjects:
3,4-ethylenediox-thiophene
Acetic acid
Acids
co-sensitizer
Coloring Agents - chemistry
Comparative studies
dft
Dye-sensitized solar cells
Dyes
Efficiency
Electric Power Supplies
Electrochemical analysis
Electrochemistry
Electrodes
Electrolytes
Energy conversion efficiency
Energy levels
Light
Models, Molecular
Molecular Conformation
Open circuit voltage
Photovoltaic cells
power conversion effiecency
Recombination
Rhodamine
Short circuit currents
Short-circuit current
Solar cells
Solar Energy
Solvents
Spectrum Analysis
Thiophenes - chemistry
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Summary:Herein, we report the design and synthesis strategy of a new class of five EDOT based co-sensitizers (CSGR1-5) by introducing different donors (2,3,4-trimethoxypheny, 2,4-dibutoxyphenyl, and 2,4-difluorophenyl) and anchoring groups (rhodamine-3-acetic acid and cyanoacetic acid) systematically. The synthesized metal-free organic co-sensitizers were employed for cocktail dye-sensitized solar cells along with N749 (black dye). The DSSC devices with a mixture of co-sensitizers (CSGR1-5) and N749 have shown a 7.95%, 8.40%, 7.81%, 6.56% and 6.99% power conversion efficiency (PCE) respectively, which was more than that of single N749 dye PCE (6.18%). Enhanced efficiency could be ascribed to the increased short circuit current ( ) and open circuit voltage ( ). The increased was achieved due to enhanced light harvesting nature of N749 device upon co-sensitization with CSGR dyes and feasible energy levels of both the dyes. The was improved due to better surface coverage which helps in decreasing the rate of recombination. The detailed optical and electrochemical properties were investigated and complimented with theoretical studies (DFT).
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules24193554