Highly efficient quasi-cubic structured perovskite for harvesting energy from artificial indoor LED light source

Abstract

Mixed cations-based perovskites have attracted a lot of interest because of their ability to harvest light energy and ambient air stability. Herein, we synthesized mixed methylammonium/formamidinium cations (MA+/FA+) perovskite materials and explored their potential for harvesting energy from the indoor LED light source. The incorporation of FA+ in methylammonium lead iodide (MAPbI3) induces a transition in crystal structure from tetragonal to intermediate quasi-cubic, resulting in a more stable and efficient quasi-cubic perovskite structured morphology. The fabricated photovoltaic devices demonstrated an efficiency of 34.07% with mixed cations compared to the reference MAPbI3 of 28.63% under the indoor LED lamp at 1000 lx. The optimized photovoltaic device has displayed considerable enhancement in short circuit current density (JSC) and open-circuit voltage (VOC), including lower hysteresis and reduced recombination losses. Furthermore, a detailed study was conducted to determine the impact of quasi-cubic crystal structures on the grains and grain boundaries that exist in the perovskite film. The surface potential (SP), and charge carrier dynamics measurements nearby grain boundaries revealed a significant decrease in defects or trap states. In brief, this work comprehensively puts forward a prospective candidature of quasi-cubic perovskites for the development of photovoltaic technology to harvest indoor light energy.