Conversely, only few papers report on optoelectronic characterization of PS semiconductors. Even when such characterization is presented, the samples are generally synthesized in bulk form (crystal or powder) or as nanoparticles. This has so far prevented the fabrication of solid-state devices, such as solar cells and LEDs. PSs in thinfilm form, which would be particularly advantageous for optoelectronic applications, are almost absent from the literature. In the following section, we will review the few studies involving PS in the context of optoelectronic energy conversion.