Castro-Hermosa, S.S.Castro-HermosaLucarelli, G.G.LucarelliTop, M.M.TopFahland, M.M.FahlandFahlteich, J.J.FahlteichBrown, T.M.T.M.Brown2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26982910.1016/j.xcrp.2020.100045The internet of things revolution requires efficient, easy-to-integrate energy harvesting. Here, we report indoor power generation by flexible perovskite solar cells (PSCs) manufactured on roll-to-roll indium-doped tin oxide (ITO)-coated ultra-thin flexible glass (FG) substrates with notable transmittance (>80%), sheet resistance (13 O/square), and bendability, surpassing 1,600 bending procedures at 20.5-mm curvature. Optimized PSCs on FG incorporate a mesoporous scaffold over SnO2 compact layers delivering efficiencies of 20.6% (16.7 mW⋅cm−2 power density) and 22.6% (35.0 mW⋅cm−2) under 200 and 400 lx LED illumination, respectively. These represent, to the best of our knowledge, the highest reported for any indoor flexible solar cell technology, surpassing by a 60%-90% margin the prior best-performing flexible PSCs. Specific powers (W/g) delivered by these lightweight cells are 40%-55% higher than their counterparts on polyethylene terephthalate (PET) films and an order of magnitude greater than those on rigid glass, highlighting the potential of flexible FG-PSCs as a key enabling technology for powering indoor electronics of the future.en620667670journal article