title: Broadband photocurrent enhancement in a-Si:H solar cells with plasmonic back reflectors.
abstract: Plasmonic light trapping in thin film silicon solar cells is a promising route to achieve high efficiency with reduced volumes of semiconductor material. In this paper, we study the enhancement in the opto-electronic performance of thin a-Si:H solar cells due to the light scattering effects of plasmonic back reflectors (PBRs), composed of self-assembled silver nanoparticles (NPs), incorporated on the cells' rear contact. The optical properties of the PBRs are investigated according to the morphology of the NPs, which can be tuned by the fabrication parameters. By analyzing sets of solar cells built on distinct PBRs we show that the photocurrent enhancement achieved in the a-Si:H light trapping window (600 - 800 nm) stays in linear relation with the PBRs diffuse reflection. The best-performing PBRs allow a pronounced broadband photocurrent enhancement in the cells which is attributed not only to the plasmon-assisted light scattering from the NPs but also to the front surface texture originated from the conformal growth of the cell material over the particles. As a result, remarkably high values of J(sc) and V(oc) are achieved in comparison to those previously reported in the literature for the same type of devices.
authors: Seweryn
authors: S
authors: Morawiec
authors: Manuel J
authors: MJ
authors: Mendes
authors: Sergej A
authors: SA
authors: Filonovich
authors: Tiago
authors: T
authors: Mateus
authors: Salvatore
authors: S
authors: Mirabella
authors: Hugo
authors: H
authors: Aguas
authors: Isabel
authors: I
authors: Ferreira
authors: Francesca
authors: F
authors: Simone
authors: Elvira
authors: E
authors: Fortunato
authors: Rodrigo
authors: R
authors: Martins
authors: Francesco
authors: F
authors: Priolo
authors: Isodiana
authors: I
authors: Crupi