Introducing a sustainable strontium-based double perovskite solar cell exceeding 32 % efficiency for advanced solar technology

Perovskites are highly promising materials for photovoltaic (PV) technology due to their superior optical properties, cost-effectiveness, high efficiency, and lightweight nature. This study proposes a novel dual-absorber PV device featuring strontium arsenic iodide (Sr3AsI3) as the top layer and strontium phosphorus iodide (Sr3PI3) as the bottom layer, analyzed using SCAPS-1D simulations. The research investigates the influence of absorber thickness, doping concentrations, and defect densities on electrical parameters such as VOC, JSC, FF, and PCE, alongside the effects of temperature and resistance (shunt and series). Initial simulations of two single-junction PSCs yielded PCEs of 29.93 % for FTO/CdS/Sr3PI3/Au and 30.09 % for FTO/CdS/Sr3AsI3/Au. Upon optimization, the dual-absorber PSC (Al/FTO/CdS/Sr3AsI3/Sr3PI3/Au) achieved a maximum PCE of 32.20 %, with a V OC of 1.02 V, J SC of 36.50 mA/cm2, and an FF of 86.80 %. This study provides valuable insights and practical strategies for the development of cost-effective, thin-film PSCs based on Sr3AsI3/Sr3PI3.