Quantifying the multifaceted influence of HTLs on the photovoltaic performance of inorganic Cs2TiBr6 solar cells: an OghmaNano numerical investigation

In this study, an environmentally friendly, stable Cs2TiBr6 perovskite solar cell (PSC) with two device configurations FTO/TiO2/Cs2TiBr6/Cu2O/Au and FTO/TiO2/Cs2TiBr6/MoO3/Au have been simulated using OghmaNano software. Two-hole transport layers (HTLs) have been used to do a comparative study. Cuprous Oxide (Cu2O) and Molybdenum Oxide (MoO3) are inorganic HTLs with bandgaps of 2.17 eV and 3 eV, respectively that are plentiful, non-toxic, and ideal for band matching. The study aims to optimize the PSCs performance by using inorganic MoO3 and Cu2O as HTL to replace the traditionally organic HTL. Key parameters like thickness, electron mobility, and recombination rate constant have been optimized to yield maximum efficiency. The outcomes show that Cu2O-HTL demonstrated superior performance with an optimal structure, resulting in a high efficiency of 21% and an improved fill factor (FF) of up to 86.52%. These findings suggest that Cs2TiBr6-based PSCs could significantly impact future photovoltaic research.