TY - JOUR
T1 - 4,8-bis(thienyl)-benzo[1,2-b:4,5-b′]dithiophene based A-π-D-π-A typed conjugated small molecules with mono-thiophene as the π-bridge
T2 - Synthesis, properties and photovoltaic performance
AU - Yin, Ni
AU - Wang, Lilei
AU - Ma, Yuchao
AU - Lin, Yi
AU - Wu, Jianchang
AU - Luo, Qun
AU - Yang, Hai Bo
AU - Ma, Chang Qi
AU - Zhao, Xin
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Abstract Two conjugated A-π-D-π-A type small molecules having a 4,8-bis(thienyl)-benzo[1,2-b:4,5-b′]dithiophene (TBDT) unit as the donor part, a mono-thiophene as the π-conjugation bridge, and 2-cyano-3-octyloxy-3-oxo-1-propenyl (COOP) or dicyanovinyl (DCV) as the terminal acceptor unit were synthesized and investigated. Both compounds showed broad absorption band over 400-600 nm and similar HOMO/LUMO energy levels. However, these two compounds showed a big difference in photovoltaic performance. The DCV-1T-TBDT:PC61BM based solar cell exhibited an open circuit voltage (VOC) of 0.93 V, a short circuit current (JSC) of 8.54 mA cm-2, a fill factor (FF) of 0.56, and an overall power conversion efficiency (PCE) of 4.48%, whereas the COOP-1T-TBDT:PC61BM based solar cell showed a VOC of 1.04 V, a JSC of 2.28 mA cm-2, an FF of 0.29, and a PCE of 0.69. Furthermore, DCV-1T-TBDT showed minor thickness-dependent PCE behavior in PV device, which is beneficial for printing processing.
AB - Abstract Two conjugated A-π-D-π-A type small molecules having a 4,8-bis(thienyl)-benzo[1,2-b:4,5-b′]dithiophene (TBDT) unit as the donor part, a mono-thiophene as the π-conjugation bridge, and 2-cyano-3-octyloxy-3-oxo-1-propenyl (COOP) or dicyanovinyl (DCV) as the terminal acceptor unit were synthesized and investigated. Both compounds showed broad absorption band over 400-600 nm and similar HOMO/LUMO energy levels. However, these two compounds showed a big difference in photovoltaic performance. The DCV-1T-TBDT:PC61BM based solar cell exhibited an open circuit voltage (VOC) of 0.93 V, a short circuit current (JSC) of 8.54 mA cm-2, a fill factor (FF) of 0.56, and an overall power conversion efficiency (PCE) of 4.48%, whereas the COOP-1T-TBDT:PC61BM based solar cell showed a VOC of 1.04 V, a JSC of 2.28 mA cm-2, an FF of 0.29, and a PCE of 0.69. Furthermore, DCV-1T-TBDT showed minor thickness-dependent PCE behavior in PV device, which is beneficial for printing processing.
KW - A-π-D-π-A type small molecules
KW - Benzo[1,2-b:4,5-b′]dithiophene derivatives
KW - Electron donor material
KW - Optical and electrochemical properties
KW - Organic solar cells
KW - Structure-property-performance relationship
UR - http://www.scopus.com/inward/record.url?scp=84929149114&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2015.04.030
DO - 10.1016/j.dyepig.2015.04.030
M3 - Article
AN - SCOPUS:84929149114
SN - 0143-7208
VL - 120
SP - 299
EP - 306
JO - Dyes and Pigments
JF - Dyes and Pigments
M1 - 4752
ER -
