title: Grating-coupled surface plasmon enhanced short-circuit current in organic thin-film photovoltaic cells.
abstract: In this study, we demonstrate the fabrication of grating-coupled surface plasmon resonance (SPR) enhanced organic thin-film photovoltaic cells and their improved photocurrent properties. The cell consists of a grating substrate/silver/P3HT:PCBM/PEDOT:PSS structure. Blu-ray disk recordable substrates are used as the diffraction grating substrates on which silver films are deposited by vacuum evaporation. P3HT:PCBM films are spin-coated on silver/grating substrates. Low conductivity PEDOT:PSS/PDADMAC layer-by-layer ultrathin films deposited on P3HT:PCBM films act as the hole transport layer, whereas high conductivity PEDOT:PSS films deposited by spin-coating act as the anode. SPR excitations are observed in the fabricated cells upon irradiation with white light. Up to a 2-fold increase in the short-circuit photocurrent is observed when the surface plasmon (SP) is excited on the silver gratings as compared to that without SP excitation. The finite-difference time-domain simulation indicates that the electric field in the P3HT:PCBM layer can be increased using the grating-coupled SP technique.
authors: Center for Transdisciplinary Research, Niigata University, 8050 Ikarashi 2-nocho,Niigata 950-2181, Japan. ababa@eng.niigata-u.ac.jp
authors: Akira
authors: A
authors: Baba
authors: Nobutaka
authors: N
authors: Aoki
authors: Kazunari
authors: K
authors: Shinbo
authors: Keizo
authors: K
authors: Kato
authors: Futao
authors: F
authors: Kaneko