Photovoltaic cell device

A photovoltaic cell device comprising:

• an optical waveguide comprising a first main surface, a second main surface facing the first main surface, and a side surface;
• an optical element facing the second main surface;
• and
• a photovoltaic cell facing the side surface, wherein
• the optical element comprises
• a first liquid crystal layer which comprises a cholesteric liquid crystal, reflects, of visible light incident on the first main surface, circularly polarized light of one of first circularly polarized light and second circularly polarized light rotating in an opposite direction of the first circularly polarized light toward the optical waveguide and the photovoltaic cell, and transmits the other circularly polarized light,
• the visible light includes a plurality of wavelength ranges, and
• the first liquid crystal layer reflects one of the first circularly polarized light and the second circularly polarized light of part of the wavelength ranges.