Glass-to-glass encapsulation with ultraviolet light curable epoxy edge sealing for stable perovskite solar cells

•Low temperature encapsulation of PSC using UV curable epoxy edge sealant developed.•Encapsulation minimized ingress of water molecules in to the PSCs.•Stability (T80) of UV epoxy encapsulated PSC aged at 30 °C, 50% RH improved beyond 70 days. Perovskite solar cells (PSCs) have rapidly achieved power conversion efficiencies comparable to those of first generation c-Si and second generation thin film solar cell technologies. Although studies on upscaling of PSC technology for practical applications are growing, operation stability remains a challenge and need to be addressed. Ingress of ambient moisture into the device architecture and subsequent decomposition of organometal halide perovskite absorber is identified as one of the major reason for poor operational stability of PSCs. In this letter, we report a low temperature glass-to-glass encapsulation of PSCs using ultraviolet (UV) light curable epoxy edge sealant. Controlled UV irradiation induces epoxy cross-linking and hermitic glass-to-glass encapsulation at