TY - JOUR
T1 - Isoindigo-based polymer solar cells with high open circuit voltages up to 1.01 v
AU - Park, Gi Eun
AU - Choi, Suna
AU - Shin, Jicheol
AU - Cho, Min Ju
AU - Choi, Dong Hoon
N1 - Funding Information:
The authors acknowledge the financial support from the National Research Foundation of Korea ( NRF2012R1A2A1A01008797 ) and from Key Research Institute Program ( NRF20100020209 ).
PY - 2016/7/1
Y1 - 2016/7/1
N2 - Isoindigo-based copolymers containing non-fluorinated (PIIDBT) and fluorinated bithiophene moieties (PIIDFBT) were synthesized. The replacement of hydrogen atoms with electronegative fluorine atom attained the intramolecular noncovalent interactions in conjugated polymer structure employing the concept of conformational locks. Furthermore, the fluorine characteristics as substituent atoms tuned the electron withdrawing ability and made the HOMO energy levels of fluorinated moieties deeper (-5.79 eV) than that of non-fluorinated polymer (-5.54 eV). As a result, the photovoltaic performance of PIIDFBT was improved by increasing its open circuit voltage (Voc) up to 1.01 V, resulting in a power conversion efficiency of 6.21%. The PIIDFBT with high Voc can be recognized as a promising candidate for both single junction and multi-junction photovoltaics.
AB - Isoindigo-based copolymers containing non-fluorinated (PIIDBT) and fluorinated bithiophene moieties (PIIDFBT) were synthesized. The replacement of hydrogen atoms with electronegative fluorine atom attained the intramolecular noncovalent interactions in conjugated polymer structure employing the concept of conformational locks. Furthermore, the fluorine characteristics as substituent atoms tuned the electron withdrawing ability and made the HOMO energy levels of fluorinated moieties deeper (-5.79 eV) than that of non-fluorinated polymer (-5.54 eV). As a result, the photovoltaic performance of PIIDFBT was improved by increasing its open circuit voltage (Voc) up to 1.01 V, resulting in a power conversion efficiency of 6.21%. The PIIDFBT with high Voc can be recognized as a promising candidate for both single junction and multi-junction photovoltaics.
KW - Fluorinated moiety
KW - Isoindigo
KW - Open circuit voltage
KW - Polymer solar cells
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U2 - 10.1016/j.orgel.2016.04.016
DO - 10.1016/j.orgel.2016.04.016
M3 - Article
AN - SCOPUS:84964434535
SN - 1566-1199
VL - 34
SP - 157
EP - 163
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
ER -
