Spectral matching and outdoor solar to electrical conversion efficiency in thin-film silicon multi-junction solar cells

19th International School on Condensed Matter Physics: Advances in Nanostructured Condensed Matter: Research and Innovations

Reynolds, S.^1 ; Urbain, F.^2,3 ; Smirnov, V.^2

School of Science and Engineering, University of Dundee, Dundee

DD1 4HN, United Kingdom^1

IEK-5 Photovoltaik, Forschungszentrum Jülich, Jülich

D-52425, Germany^2

IREC Catalonia Institute for Energy Research, Barcelona, Spain^3

关键词: Computer modelling;    Electrical conversion efficiencies;    Electrical energy;    Spectral matchings;    Spectral quality;    Thin film silicon;    Thin-film silicon solar cells;    Wide spectral range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/794/1/012025/pdf
DOI  :  10.1088/1742-6596/794/1/012025

来源: IOP

【 摘 要 】

Semi-empirical computer modelling is used to investigate spectral matching in tandem and triple-junction thin film silicon solar cells. In amorphous/microcrystalline silicon (a-Si:H/μc-Si:H) tandem cells, current mis-match is offset by an increase in fill-factor, resulting in a broad peak in efficiency versus average photon energy. For a-Si:H/a-Si:H tandem cells, photo-generated currents in both sub-cells increase with increasing average photon energy, and efficiency is predicted to increase monotonically over a wide spectral range. a-Si:H/a-Si:H/μc-Si:H triple cells exhibit spectral behaviour similar to a-Si:H/μc-Si:H tandem cells, but with a smaller fill-factor dependence. Variations in spectral quality are predicted to account for only a small reduction in annual electrical energy yield, of some 2 to 4%.