Facile fabrication and photovoltaic performance of lead-free Na2AgBiBr6 double perovskite photovoltaic cells

As next-generation photovoltaic devices, perovskite solar cells (PSCs) have captured a lot of focus because of their configurable optoelectronic characteristics, affordable solution processing costs and excellent power conversion efficiency. Novel, reasonable and ecologically conscious absorber materials are still necessary, as are simple and repetitive methods for creating devices, despite the field’s tremendous advancement. Na 2 AgBiBr 6 has been theoretically predicted as a promising lead-free light-absorbing material with favourable electronic and optical properties. However, to the best of our knowledge, no experimental demonstration of a complete Na 2 AgBiBr 6 -based photovoltaic device has been reported. In this work, to date, we present the first experimental fabrication and photovoltaic assessment of a planar FTO/TiO 2 /Na 2 AgBiBr 6 /CuSCN/Ag solar cell. The device was finalized by depositing a CuSCN hole transport layer and a top Ag electrode after Na 2 AgBiBr 6 , a recently created perovskite absorber material, was placed on TiO 2 -coated substrates. The input power for efficiency computation was found by initially measuring the solar constant under a warm white LED with a glass of water filled with black ink. Then, the voltage as well as the current of the designed device were manually recorded using the same setup. The photoactivity of Na 2 AgBiBr 6 was confirmed by the constructed device’s measured photovoltaic response, which included an open-circuit voltage (V OC ) of 0.564 V, a short-circuit current (I SC ) of 1.97 mA, a fill factor of 67.51% and a power conversion efficiency of 2.16%. This work shows that Na 2 AgBiBr 6 is a promising perovskite absorber for PSC applications, even with a reduced production and characterization approach. The outcomes establish the groundwork for future efficiency-boosting device architecture, layer thickness and interface engineering optimization. Additionally, the experimental strategy bridges the gap between the creation of materials and device functionality testing by demonstrating an approachable technique for initial device evaluation employing inexpensive, laboratory-scale equipment. The study provides information for future research into novel perovskite materials in scalable photovoltaic applications and emphasizes the viability of Na 2 AgBiBr 6 -based solar cells.