Semiconducting carbon nanotube/fullerene blended heterojunctions for photovoltaic near-infrared photon harvesting
Carbon nanotube, bulk heterojunction, photovoltaic, photodetector, NIR
ABSTRACT We demonstrate that the near-infrared (NIR) absorptivity of semiconducting single-walled carbon nanotubes (s-SWCNTs) can be harnessed in blended heterojunctions with the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Photogenerated charge separation is efficiently driven by the ultrahigh interfacial area of the blends and the favorable energy offsets between the two materials. NIR-sensitive photovoltaic and photodetector devices utilizing the stack (indium tin oxide/ca. 10 nm s-SWCNT:PCBM/100 nm C60/10 nm 2,9- dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)/Ag) were fabricated with NIR power conversion efficiencies >1.3% and peak, zero bias external quantum efficiency of 18% at λ = 1205 nm.
Tsinghua University Press
Dominick J. Bindl,Adam S. Brewer,Michael S. Arnold, Semiconducting carbon nanotube/fullerene blended heterojunctions for photovoltaic near-infrared photon harvesting. NanoRes.2011, 4(11): 1174-1179