Enhanced Efficiency of Tandem Perovskite Solar Cells Utilizing Cs<sub>2</sub>BiAgI<sub>6</sub> and La<sub>2</sub>NiMnO<sub>6</sub> Double Perovskite Absorbers with Optimized Charge Transport Layers
J. Prasanna, Atul Kumar, Ravi Kumar M, K. Gayathri, Chella Santhosh, S. V. Aswin Kumer, E. Mohan, Sridhar Udayakumar
Abstract
This study investigates the application of Cs 2 BiAgI 6 and La 2 NiMnO 6 double perovskite compounds as absorbers in perovskite solar cells (PSCs). Computational simulations were employed to assess the performance of these compounds in isolation, employing various hole transport layers (HTLs). The simulations were geared towards optimizing the HTL thickness for each absorber, ensuring proficient charge transport and current alignment. Through these simulations, valuable insights into the electronic properties and light absorption characteristics of the individual absorbers were obtained. Subsequently, a tandem simulation was executed, aligning the current outputs of both devices through precise adjustment of thickness. This tandem configuration was designed to maximize the overall efficiency of the PSC system. The simulation outcomes explicitly demonstrated that the integration of Cs 2 BiAgI 6 and La 2 NiMnO 6 in a tandem configuration led to superior performance in comparison to the standalone absorbers. The optimized HTL thicknesses facilitated enhanced charge transport and guaranteed current alignment between the two devices. This paper offers significant contributions to the conceptualization and fine‐tuning of tandem PSCs utilizing Cs 2 BiAgI 6 and La 2 NiMnO 6 as absorber materials, presenting potential avenues for augmenting the overall efficiency of PSC systems. Subsequently, further optimization of the tandem configuration led to an impressive power conversion efficiency (PCE) of 30.256%, open circuit voltage ( V oc ) of 1.682 V, fill factor (FF) of 79.74%, and short‐circuit current density ( J sc ) of 24.11 mA/cm 2 , respectively.