title: Plasmonic backcontact grating for P3HT:PCBM organic solar cells enabling strong optical absorption increased in all polarizations.
abstract: In P3HT:PCBM based organic solar cells we propose and demonstrate numerically plasmonic backcontact grating architectures for strong optical absorption enhanced in both transverse-magnetic and transverse-electric polarizations. Even when the active material is partially replaced by the metallic grating (without increasing the active layer film thickness), we show computationally that the light absorption in thin-film P3HT:PCBM is increased by a maximum factor of ~21% considering both polarizations under AM1.5G solar radiation and over a half-maximum incidence angle of 45° (where the enhancement drops to its half) compared to the same cell without a grating. This backcontact grating outperforms the typical plasmonic grating placed in PEDOT:PSS layer.
authors.affiliation: Department of Electrical and Electronics Engineering, UNAM - National Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey. sefunc@ee.bilkent.edu.tr
authors.forename: Mustafa Akin
authors.initials: MA
authors.lastname: Sefunc
authors.forename: Ali Kemal
authors.initials: AK
authors.lastname: Okyay
authors.forename: Hilmi Volkan
authors.initials: HV
authors.lastname: Demir