Photonic design of embedded dielectric scatterers for dye sensitized solar cells. Issue 42 (8th April 2015)

• Record Type: Journal Article
• Authors: Byranvand, Mahdi Malekshahi; Dabirian, Ali; Kharat, Ali Nemati; Taghavinia, Nima
• Is Part Of: RSC advances. Volume 5:Issue 42(2015)
• Page Start: 33098
• Page End: 33104
• Publication Date: 2015-04-08
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra04020e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A photonic design approach is proposed to determine the optimal size and concentration of dielectric scatterers for nanostructured solar cells. Abstract : Embedded dielectric scatterers comprise an important approach for light trapping in dye-sensitized solar cells (DSCs) due to their simple fabrication process. The challenge in applying these scatterers lies in finding the optimal dimensions and concentration of the scatterers. This requires many experiments and it is often quite difficult to have a starting point for optimizing the concentration. Based on theories of light propagation in random media, we propose a simple model for DSCs with embedded silica spherical particles. Then, by full-wave optical calculations, we determine a narrow range for the concentration of silica particles that leads to the largest optical absorption in the cell. The simulation results were verified by realizing DSCs with different concentrations of silica particles. A power conversion efficiency of 8.08% in an 11 μm-thick N719-sensitized DSC was achieved with 6 vol% embedded silica, which further increased to 9.30% by applying a white scattering layer on the rear-side of the counter electrode. The design approach, presented here, is a general approach that can be applied for other types of solar light harvesting structures with low optical absorption coefficient.