The use of fossil fuels leads to the release of greenhouse gases harmful to the environment, and therefore there has been increased investment in renewable energies, specifically in solar energy, due to its being a clean source, noiseless, and an abundant energy source. Perovskite materials are strong candidates for use in the study of converting solar energy into electricity, as they possess properties that allow for efficient solar energy absorption, as well as easy processing and low cost when compared to the silicon used in commercially available solar panels. The most investigated materials are inorganic lead perovskites (which show good stability/low yield) and/or organic-inorganic hybrids (high yield/low stability). However, the presence of lead is not beneficial, so investing in lead-free materials where Sb and Bi serve as good substitutes for lead and are explored in various optoelectronic applications is viable. With the above in mind, the present study investigates the properties of the inorganic perovskite with the formula Cs3Sb2I9, utilizing the organic molecule thiophene (C4H4S) during its synthesis, with the aim of verifying the induced modifications and applying them in a photovoltaic device to elucidate the material's power conversion efficiency (PCE). By producing materials with 0%, 9%, and 17% (w/w) of thiophene, the additive facilitated the enhancement of crystallinity as well as the suppression of secondary phases. It induced changes in the bandgap (2.23 eV, 2.00 eV, and 1.95 eV) and altered the morphology of the hexagonal plate-like powder to something resembling needles and leaves. This also led to a more pronounced agglomeration of particles, making their surface more interconnected, respectively. These properties are relevant to the use of these materials in solar cells. Raman spectra showed the same profiles for the three samples, indicating that there is no alteration in the crystal lattice bonds. By constructing a microcell with the configuration FTO/TiO2/Perovskite/NiOx/Ag, a PCE of 0.42% was achieved for the perovskite doped at 9% (Voc: 0.059V; Jsc: 0.27mA; FF: 19.37%), representing the best result compared to 0.2% with the perovskite at 17%. The results provide insights into the study of additives in modulating the properties of inorganic materials for solar cells.