LIGHT CONDENSING DEVICE, PHOTOVOLTAIC DEVICE, LIGHT CONDENSING SHEET, PHOTOVOLTAIC SHEET, AND METHOD FOR MANUFACTURING LIGHT CONDENSING DEVICE OR PHOTOVOLTAIC DEVICE

摘要

[Problem] To provide a photovoltaic device and a light condensing device having a high condensing rate which can be manufactured easily and at low cost. [Solution] This light condensing device is provided with: a light-guiding substrate for causing light to propagate between a rear-side surface and a front-side surface for receiving light from a light source; a reflective layer for light guiding, in which a reflection-type hologram is formed for reflecting light incident at a first incidence angle less than the critical angle of the light-guiding substrate at a reflection angle greater than the critical angle, the reflective layer being provided to the rear-side surface; and an emission window for causing light incident at a second incidence angle equal to or greater than the critical angle to be emitted from the light-guiding substrate, the emission window being provided to the front-side surface and/or the rear-side surface.