Synthesis, electrochromic characterization and solar cell application of thiophene bearing alternating copolymers with azobenzene and coumarin subunits
Date
2020Author
Kalay, Huseyin and Yigit, Deniz and Hizalan, Gonul and Gullu, Mustafa
and Depci, Tolga and Cirpan, Ali and Toppare, Levent and Hacioglu,
Serife O.
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In this study, azobenzene and coumarin functionalized thiophene
comprising two copolymers (poly (4-((3{''}'-hexyl-{[}2,2 `:5 `,2 `':5
`',2{''}'-tetrathiophene] - 3 `-yl)methoxy) - 2H-chromen-2-one (P1) and
poly (1-(4-((4{''}'-hexyl-{[}2,2 `: 5 `, 2 `': 5 `', 2{''}' -
tetrathiophene] - 3 `-yl) methoxy) phenyl) -2-phenyldiazene) (P2)), were
designed and synthesized according to the donor-acceptor (D-A) approach
to investigate their electrochemical, optical and photovoltaic
behaviors. Among the various copolymerization methods to obtain P1 and
P2, Stille copolymerization reaction was preferred. The HOMO and LUMO
values were determined via cyclic voltammetry (CV) as -5.64 eV and -3.76
eV for P1 and -5.47 eV and -3.83 eV for P2, respectively. The optical
band gaps of the polymers were calculated as 1.88 eV and 1.64 eV using
UV-VIS spectrophotometer for P1 and P2. Electrochemical and
spectroelectrochemical studies for synthesized copolymers support their
usage in organic solar cell applications. The organic solar cells (OSCs)
were designed using polymer as an electron donor group and PC60BM as an
electron acceptor group. Performances of OSCs based on P1 and P2 were
investigated with the device structure of
ITO/PEDOT:PSS/Polymer(P1/P2):PC60BM/LiF/Al. The preliminary solar cell
results were reported here and studies are going on in our laboratories
to increase the efficiency. The highest power conversion efficiency was
obtained as 0.81\% for P1 based device with 0.47 V open-circuit voltage
(V-oc) and 4.92 mA/cm(2) current density (J(sc)) values. The highest
efficiency for P2 comprising device was found to be 0.96\% under optimum
conditions with 0.60 V and 4.98 mA/cm(2), V-oc and J(sc) values,
respectively.
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