Synthesis of new alternating conjugated copolymers consisting of tetrazine/carbazole or tetrazine/fluorene derivatives along with thiophene spacers for photovoltaic applications

[Display omitted] ► Tetrazine-carbazole (PCTz) and tetrazine-fluorene polymers were synthesized. ► The bandgap and HOMO level of PCTz were 2.23 and −5.32eV, respectively. ► PCTz had a very high absorption coefficient. ► The open-circuit voltage of PCTz solar cells was very high. ► Under the same con...

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Bibliographic Details
Published in:Synthetic metals 2012-01, Vol.161 (23-24), p.2785-2791
Main Authors: Baek, Myung-Jin, Jang, Wooree, Lee, Soo-Hyoung, Lee, Youn-Sik
Format: Article
Language:English
Subjects:
Applied sciences
Carbazole
Carbazoles
Conjugated polymer
Copolymers
Deep HOMO
Derivatives
Devices
Energy
Exact sciences and technology
Fluorene
Natural energy
Organic polymers
Photovoltaic cells
Photovoltaic conversion
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
Solar cell
Solar cells
Solar cells. Photoelectrochemical cells
Solar energy
Spacers
Tetrazine
Thiophenes
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Summary:[Display omitted] ► Tetrazine-carbazole (PCTz) and tetrazine-fluorene polymers were synthesized. ► The bandgap and HOMO level of PCTz were 2.23 and −5.32eV, respectively. ► PCTz had a very high absorption coefficient. ► The open-circuit voltage of PCTz solar cells was very high. ► Under the same conditions, the power conversion efficiency was 2.13%. In order to investigate the relationships between chemical structures of conjugated polymers and their properties with respect to photovoltaic applications, two new copolymers consisting of an electron-deficient tetrazine unit and either an electron-rich carbazole (PCTz) or fluorene (PFTz) along with thiophene spacers were synthesized. The estimated electrochemical bandgap and HOMO level of PCTz and PFTz were 2.23/−5.32eV and 2.48/−5.60eV, respectively. PCTz had a very high absorption coefficient, which was even higher than poly(3-hexyltiophene) in chloroform solution. The bulk heterojunction photovoltaic devices fabricated using PCTz and [6,6]-phenyl-C71-butyric acid methyl ester had a high open-circuit voltage (1.0V) under AM 1.5G illumination at 100mW/cm2 with a power conversion efficiency of 2.13%.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2011.10.020