TY - JOUR
T1 - Small-molecule vinazene acceptors for bulk heterojunction organic photovoltaics
AU - Lim, Eunhee
AU - Lee, Sungkoo
AU - Lee, Kyeong K.
PY - 2012/10/18
Y1 - 2012/10/18
N2 - This paper reports the synthesis and characterization of a new vinazene-based small molecule, 4,7-bis(2-(1-(2-ethylhexyl)-4,5-dicyanoimidazol- 2-yl) vinyl)diketopyrrolopyrrole (EV-DPP). The known vinazene-based small molecule, 4,7-bis(2-(1-(2-ethylhexyl)-4,5-dicyanoimidazol-2-yl)vinyl)benzo[c][1, 2,5]thiadizole (EV-BT), was also prepared for comparison. The benzothiadiazole unit in EV-BT was replaced with a DPP unit in EV-DPP because DPP units are strong absorbing chromospheres. The UV absorption maxima of EV-DPP film (λ max = 386, 573 nm) were greatly red shifted compared to the maxima of EV-BT film (λ max = 337, 444 nm). Our preliminary device work showed the possibility of the use of EV-DPP as an electron acceptor in OPVs. The P3HT: EV-DPP film showed a better power conversion efficiency of 0.02% compared to P3HT: EV-BT due to the preferable UV absorption characteristics of EV-DPP.
AB - This paper reports the synthesis and characterization of a new vinazene-based small molecule, 4,7-bis(2-(1-(2-ethylhexyl)-4,5-dicyanoimidazol- 2-yl) vinyl)diketopyrrolopyrrole (EV-DPP). The known vinazene-based small molecule, 4,7-bis(2-(1-(2-ethylhexyl)-4,5-dicyanoimidazol-2-yl)vinyl)benzo[c][1, 2,5]thiadizole (EV-BT), was also prepared for comparison. The benzothiadiazole unit in EV-BT was replaced with a DPP unit in EV-DPP because DPP units are strong absorbing chromospheres. The UV absorption maxima of EV-DPP film (λ max = 386, 573 nm) were greatly red shifted compared to the maxima of EV-BT film (λ max = 337, 444 nm). Our preliminary device work showed the possibility of the use of EV-DPP as an electron acceptor in OPVs. The P3HT: EV-DPP film showed a better power conversion efficiency of 0.02% compared to P3HT: EV-BT due to the preferable UV absorption characteristics of EV-DPP.
KW - DPP
KW - Heck coupling
KW - OPV
KW - organic photovoltaic cells
KW - solar cells
KW - vinazene
UR - http://www.scopus.com/inward/record.url?scp=84865846101&partnerID=8YFLogxK
U2 - 10.1080/15421406.2012.693285
DO - 10.1080/15421406.2012.693285
M3 - Article
AN - SCOPUS:84865846101
SN - 1542-1406
VL - 565
SP - 98
EP - 105
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
IS - 1
ER -