Electron-rich anthracene semiconductors containing triarylamine for solution-processed small-molecule organic solar cells.
New electron-rich anthracene derivatives containing triarylamine hole stabilizers, 2,6-bis[5,5'-bis(N,N'-diphenylaniline)-2,2'-bithiophen-5-yl]-9,10-bis-[(triisopropylsilyl)ethynyl]anthracene (TIPSAntBT-TPA) and 2,6-bis(5,5'-bis{4-[bis(9,9-dimethyl-9H-fluoren-2-yl)amino]phenyl}-2,2'-bithiophen-5-yl)-9,10-bis-[(triisopropylsilyl)ethynyl]anthracene (TIPSAntBT-bisDMFA), linked with π-conjugated bithiophene bridges, were synthesized and their photovoltaic characteristics were investigated in solution-processed small-molecule organic solar cells (SMOSCs). These new materials exhibited superior intramolecular charge transfer from triarylamine to anthracene, leading to a more electron-rich anthracene core that facilitated electron transfer into phenyl-C(61)-butyric acid methyl ester. Compared with TIPSAntBT and triarylamine, these materials show a threefold improvement in hole-transporting properties and better photovoltaic performance in solution-processed SMOSCs, with the best power conversion efficiency being 2.96 % at a high open-circuit voltage of 0.85 V.
Department of New Materials Chemistry, Korea University, Chungnam, 330-700, South Korea.
Hyeju
H
Choi
Haye Min
HM
Ko
Nara
N
Cho
Kihyung
K
Song
Jae Kwan
JK
Lee
Jaejung
J
Ko
D000588:Amines / Q000737:chemistry*; D000873:Anthracenes / Q000737:chemistry*; D011211:Electric Power Supplies; D004579:Electron Transport; D004583:Electrons; D008958:Models, Molecular; D008968:Molecular Conformation; D012666:Semiconductors; D012993:Solar Energy; D012996:Solutions
D000588:Amines; D000873:Anthracenes; D012996:Solutions; C034020:anthracene