Perovskite solar cell (PSC) is a promising next-generation candidate for photovoltaic conversion. Arguably the biggest challenge ahead is improving the operational stability of PSCs to reach similar lifetimes as silicon-based cells. Our team works on designing effective passivators coated on perovskite photoactive layer against water and heat to improve the device long-term operational stability. In addition to solar photovoltaics, we are also interested in using PSC for indoor photovoltaics to power wireless devices for Internet of Things (IoT).