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Study of Donor–Acceptor–π–Acceptor Architecture Sensitizers with Benzothiazole Acceptor for Dye‐Sensitized Solar Cells
Author(s) -
Koyyada Ganesh,
Singh Surya Prakash,
Bhanuprakash K.,
Han Liyuan,
Bedja Idriss M.,
Gupta Ravindra Kumar,
Islam Ashraful,
Chandrasekharam M.
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500431
Subject(s) - benzothiazole , acceptor , photochemistry , dielectric spectroscopy , materials science , electron donor , open circuit voltage , electron transfer , short circuit , chemistry , electron acceptor , electrochemistry , catalysis , electrode , organic chemistry , voltage , physics , quantum mechanics , condensed matter physics
Abstract A new additional benzothiazole (BT) acceptor has been introduced into metal‐free organic dyes ( MCG1 – MCG4 ) to construct donor–acceptor–π–acceptor (D‐A‐π‐A) architecture with the systematic replacement of diheteroanthracene donors and heteroaromatic π‐bridge components. BT not only facilitates effective electron transfer from the donor to the anchoring group, but also lowers the band gap. The planarity of the sensitizers induces J aggregation on TiO 2 , causes the redshift on TiO 2 , and enhances the light‐harvesting efficiency up to λ =750–800 nm. Transient absorption spectroscopy and electrochemical impedance spectroscopy have been used to understand the trends in short‐circuit current ( J sc ) and open‐circuit voltage ( V oc ). Dye MCG4 showed a superior efficiency of 6.46 %. DFT has been complemented with experimentally determined photoelectrochemical properties. These molecules are new and support π‐bridge extension with BT for better performance of D‐A‐π‐A organic sensitizers.