The various wavelengths of the solar spectrum can be exploited for different functionalities. Davy et al. develop an organic solar cell that harvests near-ultraviolet photons to power an electrochromic device that controls how many photons go through a smart window in other wavelength ranges, adjusting both visible light and heat ingress.
See Davy et al. 2, 17104 (2017) and News and Views by Delia Milliron, article 17116.