Investigation of Screen-Printed CsPbBr₃ Solar Cells as Receivers for Blue Laser-Driven Optical Wireless Power Transfer in Air and Underwater

Optical wireless power transfer (OWPT) using laser illumination has emerged as a promising alternative for energy delivery in environments where conventional wireless methods face strong limitations, such as underwater. In this work, we demonstrate screen-printed cesium lead bromide (CsPbBr₃) perovskite solar cells as receivers for blue-laserdriven OWPT. The fabricated devices exhibit a power conversion efficiency (PCE) of 5.01% under 405-nm laser excitation, nearly double their performance under AM 1.5G illumination (2.24%). This enhancement arises from efficient absorption of above-bandgap photons and increased photocurrent density. The devices maintained stable output with varying laser distance and continuous illumination, confirming their operational robustness. Importantly, epoxyencapsulated CsPbBr₃ solar cells operated reliably when immersed in water, achieving comparable efficiency to operation in air. These findings establish CsPbBr₃ photovoltaics as strong candidates for practical OWPT applications, particularly in underwater environments.