title: Morphological device model for organic bulk heterojunction solar cells.
abstract: We present a numerical model for calculating current-voltage characteristics of polymer:fullerene bulk hetrojunction solar cells at different degrees of nanoscale phase separation. We show that the short-circuit current enhancement with finer phase separation is due to a reduction in bimolecular recombination caused by lateral movement of photogenerated electrons to the fullerene-rich phase. At high bias, vertical electron transport is enhanced and lateral movement is reduced, causing a significant field-dependent carrier extraction for coarse morphologies.
authors.affiliation: Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.
authors.forename: K
authors.initials: K
authors.lastname: Maturová
authors.forename: S S
authors.initials: SS
authors.lastname: van Bavel
authors.forename: M M
authors.initials: MM
authors.lastname: Wienk
authors.forename: R A J
authors.initials: RA
authors.lastname: Janssen
authors.forename: M
authors.initials: M
authors.lastname: Kemerink