These findings underscore the necessity of minimizing series resistance in photovoltaic devices to maximize efficiency, as corroborated by extensive research in the field . From the above discussion, it can be said that both cells show optimized efficiency, which is also practically achievable. According to Shockley-Queisser Limit, the maximum efficiency achievable for a single-junction solar cell is 33.14%, and the efficiency of both MAPbI3 and MASnI3-based cells does not exceed the limit . The previous study also confirmed the achievability of these efficiencies as MAPbI3-based achieved a power conversion efficiency of 26.74% , and MASnI3-based cells achieved 27.43% power conversion efficiency in the previous study. Here both cells are optimized and can provide optimal efficiency. The quantum efficiency of both cells in Figure clearly identifies that both cells are optimized. Here, both cells show nearly 87% quantum efficiency. However, the quantum efficiency of both cells reaches almost 100% at the midrange of the wavelength and drops significantly at the final range of wavelength.