A study of Cesium Titanium Bromide based perovskite solar cell with different Hole and Electron transport materials

As lead-based perovskite solar cells (PSCs) have a detrimental effect on the environment, lead-free Titaniumbased PSCs are drawing more attention to the researchers. Only experimental literature using lead-free Cesium Titanium Bromide $(\mathrm{C}_{\mathrm{S}2}\mathrm{T}\mathrm{i}\mathrm{B}\mathrm{r}\epsilon)$ as the absorber layer has been published with an efficiency of 3.3%. However, analyzing the performance of this PSC is necessary through device simulation. In our work, we have studied the appropriate charge transport materials for $\mathrm{C}_{\mathrm{S}2}\mathrm{T}\mathrm{i}\mathrm{B}\mathrm{r}\epsilon$ based n-i-p structured PSC using SCAPS-ID simulation software. We find that $\mathrm{M}\mathrm{o}\mathrm{O}_{3}$ and $\mathrm{S}\mathrm{n}\mathrm{O}_{2}$ are suitable to be the hole transport material (HTM) and electron transport material (ETM) respectively. We also studied the optimum thickness of absorber layer, hole transport layer (HTL), and electron transport layer (ETL). The result provides an efficiency of $\sim$ 5.82% which may have a positive impact on further research of $\mathrm{C}_{\mathrm{S}2}\mathrm{T}\mathrm{i}\mathrm{B}\mathrm{r}\epsilon$ based perovskite solar cell.