Enhanced charge collection in confined bulk heterojunction organic solar cells
Allen, J.E.; Yager, K.G.; Nam, C.-Y.; Ocko, B.M.; Black, C.T. "Enhanced charge collection in confined bulk heterojunction organic solar cells" Applied Physics Letters 2011
We show that charge mobility in P3HT can be enhanced by confining it within nano-scale pores.
Confining blended poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester organic solar cell active layers within nanometer-scale cylindrical pores nearly double the supported short-circuit photocurrent density compared to equivalent unconfined volumes of the same blend and increases the poly(3-hexylthiophene) hole mobility in the blend by nearly 500 times. Grazing incidence x-ray diffraction measurements show that the confinement changes the polymer orientation distribution, suppressing low charge conductivity orientations while simultaneously disrupting polymer ordering.