Open AccessHigh-efficiency, broad-band and wide-angle optical absorption in ultra-thin organic photovoltaic devices
Author(s) -
Wenyan Wang,
Yuying Hao,
Yanxia Cui,
Ximin Tian,
Ye Zhang,
Hua Wang,
Fang Shi,
Bin Wei,
Wei Huang
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.00a376
Subject(s) - materials science , optoelectronics , grating , organic solar cell , plasmon , optics , active layer , surface plasmon , polarization (electrochemistry) , plasmonic solar cell , surface plasmon polariton , thin film , planar , energy conversion efficiency , polymer solar cell , layer (electronics) , nanotechnology , polymer , chemistry , physics , thin film transistor , composite material , computer graphics (images) , computer science
Metal nanogratings as one of the promising architectures for effective light trapping in organic photovoltaics (OPVs) have been actively studied over the past decade. Here we designed a novel metal nanowall grating with ultra-small period and ultra-high aspect-ratio as the back electrode of the OPV device. Such grating results in the strong hot spot effect in-between the neighboring nanowalls and the localized surface plasmon effect at the corners of nanowalls. These combined effects make the integrated absorption efficiency of light over the wavelength range from 400 to 650 nm in the active layer for the proposed structure, with respect to the equivalent planar structure, increases by 102% at TM polarization and by 36.5% at the TM/TE hybrid polarization, respectively. Moreover, it is noted that the hot spot effect in the proposed structure is more effective for ultra-thin active layers, which is very favorable for the exciton dissociation and charge collection. Therefore such a nanowall grating is expected to improve the overall performance of OPV devices.