This dataset accompanies the publication "Re-defining Non-tracking Solar Cell Efficiency Limits with Directional Spectral Filters" published in ACS Photonics. The data can be used to reproduce plots in figures 1-4 in the main text and all plots in the supporting information. All data presented was generated using codes, which are also provided as detaild below. All figure files are in .csv and easily readable. 

For all figures parts that present new data, the data to reproduce the figure is found in a .csv file with the filename corresponding to the figure part. Each file has headers detailing the data in that part of the spreadsheet.

All codes used to generate figures can be found in a .zip file, with all codes appropriately commented to explain their function and an 'Overall note' explaining the organisation of codes. All codes were developed in Matlab 2021 version.

This data, and the accompanying paper, were produced by: Alan R. Bowman, Jiaming Ma, Germán García Martínez and Giulia Tagliabue. The DOI is https://zenodo.org/doi/10.5281/zenodo.12077893 and the associated license CC-BY-4.0.

The abstract for the associated paper is as follows:

Optical filters that respond to the wavelength and direction of incident light can be used to increase the efficiency of tracking solar cells. However, as tracking solar cells are more expensive to install and maintain, it is likely that nontracking solar cells will remain the main product of the (terrestrial) solar cell industry. Here we demonstrate that directional spectral filters can also be used to increase the efficiency limit of nontracking solar cells at the equator beyond what is currently understood by up to ∼0.5% (relative ∼1.8%). We also reveal that such filters can be used to regulate the energy output of solar cells throughout a day or year, and can reduce the thickness of the absorber layer by up to 40%. We anticipate that similar gains would be seen at other latitudes. As this filter has complex wavelength-direction functionality, we present a proof-of-concept design based on Luneburg lenses, demonstrating these filters can be realized. Our results will enable solar cells with higher efficienyand more stable output while using less material.