TY - JOUR
T1 - Low bandgap carbazole copolymers containing an electron-withdrawing side chain for solar cell applications
AU - Lee, Jung Feng
AU - Hsu, Steve Lien Chung
AU - Lee, Po I.
AU - Chuang, Hung Yi
AU - Yang, Ming Lun
AU - Chen, Jen Sue
AU - Chou, Wei Yang
N1 - Funding Information:
The financial support provided by the National Science Council (Taiwan, ROC) through project NSC 99-2627-E-006-001 is greatly appreciated. The authors also thank Prof. Yuh-Lang Lee at the Department of Chemical Engineering of National Cheng-Kung University for his kind help of external quantum efficiency (EQE) measurement.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/10
Y1 - 2011/10
N2 - A new series of low bandgap carbazole copolymers containing an electron-withdrawing moiety as a side chain, via Suzuki, Yamamoto, and Stille polymerization reactions has been synthesized. Their bandgaps and molecular energy levels can be tuned by copolymerizing with different conjugated electron-donating units. The resulting copolymers have low optical and electrochemical bandgaps. The optical bandgaps of the copolymers range from 1.79 to 1.24 eV. In order to investigate their photovoltaic properties, polymer solar cell devices based on low bandgap copolymers were fabricated with a structure of ITO/PEDOT:PSS/copolymers:PCBM/Al, under the illumination of AM 1.5 G, 100 mW/cm2. The power conversion efficiencies (PCE) of the polymer solar cells based on these low bandgap copolymers were measured. The best performance was obtained by using PC-CARB as the electron donor and 6,6-phenyl C71-butyric acid methyl ester (PC71BM) as the electron acceptor. The PCE of the solar cell based on PC-CARB/P71CBM (1:4) was 1.27% with an open-circuit voltage (Voc) of 0.65 V, and a short-circuit current (Jsc) of 6.69 mA/cm2.
AB - A new series of low bandgap carbazole copolymers containing an electron-withdrawing moiety as a side chain, via Suzuki, Yamamoto, and Stille polymerization reactions has been synthesized. Their bandgaps and molecular energy levels can be tuned by copolymerizing with different conjugated electron-donating units. The resulting copolymers have low optical and electrochemical bandgaps. The optical bandgaps of the copolymers range from 1.79 to 1.24 eV. In order to investigate their photovoltaic properties, polymer solar cell devices based on low bandgap copolymers were fabricated with a structure of ITO/PEDOT:PSS/copolymers:PCBM/Al, under the illumination of AM 1.5 G, 100 mW/cm2. The power conversion efficiencies (PCE) of the polymer solar cells based on these low bandgap copolymers were measured. The best performance was obtained by using PC-CARB as the electron donor and 6,6-phenyl C71-butyric acid methyl ester (PC71BM) as the electron acceptor. The PCE of the solar cell based on PC-CARB/P71CBM (1:4) was 1.27% with an open-circuit voltage (Voc) of 0.65 V, and a short-circuit current (Jsc) of 6.69 mA/cm2.
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U2 - 10.1016/j.solmat.2011.05.029
DO - 10.1016/j.solmat.2011.05.029
M3 - Article
AN - SCOPUS:79960559258
VL - 95
SP - 2795
EP - 2804
JO - Solar Cells
JF - Solar Cells
SN - 0927-0248
IS - 10
ER -
