Anuchytt Inna, Chaowaphat Seriwattanachai, Ladda Srathongsian, Noppawit Sukpan, K. Choodam, Thana Chotchuangchutchaval, Suwilai Chavenghong, Anusit Kaewprajak, Pisist Kumnorkaew, Pasit Pakawatpanarut, Duangmanee Wongratanaphisan, Pipat Ruankham, Pongsakorn Kanjanaboos
Harvesting ambient indoor light presents a promising avenue for battery-free electronics, yet its practical implementation faces challenges due to limited operational output power and environmental robustness. Here we demonstrate a durable and low-cost perovskite-based indoor power system that enables long-term and battery-free operation under realistic indoor/humid and indoor/water environments (modified-ISOS-LC-1) by integrating carbon-based perovskite solar cells with a multilayer encapsulation architecture and concentrating techniques. A compact concentrator integrated model exhibits 1.73 V of V OC and 0.222 mA cm −2 of J SC (1-cm 2 active area) under low-light illumination, substantially exceeding typical requirements for triple-A-battery-needed electronic devices (∼1.5 V). The device stability exhibits exceptional resistance to moisture and water exposure, including sustained operation under full water immersion. Accelerated aging system (modified-ISOS-LC-2) and reliability modelling indicate operational lifetimes beyond 10000 h under indoor conditions. We further demonstrate the practical relevance of this approach by continuously powering low-power internet of things (IoTs) sensors without external energy storage under different indoor light conditions.