Abstract
We review several examples of how spectrally-selective photonic structures may be used to improve solar cell systems. Firstly, we introduce different spectrally-selective structures that are based on interference effects. Examples shown include Rugate filter, edge filter and 3D photonic crystals such as artificial opals. In the second part, we discuss several examples of photovoltaic (PV) concepts that utilize spectral selectivity such as fluorescence collectors, upconversion systems, spectrum splitting concepts and the intermediate reflector concept. The potential of spectrally selective filters in the context of solar cells is discussed.
Highlights
Optical elements are used in many different ways for the task of improving solar cell efficiencies.Examples range from antireflection coatings, i.e., layers deposited directly on the solar cell to reduce front surface reflections [1,2], to lenses or mirrors, devices separated from the cell to concentrate radiation [3,4]
In this work we summarized several aspects of how solar cell systems may be improved by spectrally selective optical elements
We started with a discussion of several spectrally selective filters
Summary
Optical elements are used in many different ways for the task of improving solar cell efficiencies. A specific spectral range in which the filter is highly reflective; 2. The defining characteristics of spectrally-selective filters for PV applications are typically: 1. In most PV concepts, the reflection is used to trap and transport light to the solar cell. Light reflected at different places within the structures interferes constructively or destructively, creating the desired high reflectance or transmittance. Several examples of such filters are introduced in the paragraph. These examples are the Rugate filter, the band stop filter and the opal Design criteria for these filters are presented and reflection characteristics are shown. The aim is, to deliver a compendium of the ideas behind spectral selectivity in PV that is adorned with interesting and illustrative examples
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