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Effect of Thiophene Spacer Position in Carbazole‐Based Dye‐Sensitized Solar Cells on Photophysical, Electrochemical and Photovoltaic Properties
Author(s) -
Samae Ruslan,
Surawatanawong Panida,
Eiamprasert Utt,
Pramjit Songyos,
Saengdee Laksana,
Tangboriboonrat Pramuan,
Kiatisevi Supavadee
Publication year - 2016
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201600353
Subject(s) - thiophene , carbazole , dye sensitized solar cell , moiety , chemistry , photochemistry , electron acceptor , acceptor , electron donor , electrochemistry , energy conversion efficiency , conjugated system , cyclic voltammetry , materials science , optoelectronics , organic chemistry , electrode , polymer , catalysis , electrolyte , physics , condensed matter physics
The synthesis, photophysical and electrochemical properties, and photovoltaic performances in dye‐sensitized solar cells (DSSCs) of five new metal‐free organic sensitizers with a carbazole moiety as the electron donor are reported. The compounds contain a thiophene at various positions and a cyanoacrylic acid unit as the electron acceptor. The position of the thiophene moiety affected both the photophysical and electrochemical properties, leading to conversion efficiencies of 1.44 to 4.57 % under AM 1.5 solar conditions (100 mW cm –2 ). The best performance and longest electron lifetime were found when a thiophene was located on both donor and acceptor sites. The DSSC showed a short‐circuit current ( J sc ) of 8.59 mA/cm 2 , an open‐circuit photovoltage ( V oc ) of 0.75 V, and a fill factor ( FF ) of 0.71. The position of the π‐conjugated bridges not only affects the absorption spectra and the energy levels of the sensitizers, but also adjusts the electron lifetime.