Roadmap on halide perovskite and related devices<br>.

Since the first report on solid-state perovskite solar cell (PSC) with ~10% power conversion efficiency (PCE) and 500 h-stability in 2012, tremendous efforts have been being devoted to develop PSCs with higher PCE, longer stability and recycling hazardous lead waste. As a result, PCE over 23% was recorded in 2018 and stability over 10,000 h was reported. Beyond photovoltaics, lead halide perovskite materials demonstrated superb properties when they were applied to flat-panel X-ray detector and non-volatile resistive switching memory. In this review, progresses of lead halide perovskite in photovoltaics, X-ray imaging and memristor are investigated. Pb-based PSCs and non-Pb-based PSCs are compared, where technologies of non-Pb-based PSCs are not matured for commercialization. Pb-based PSCs were found to be highly suitable for both terrestrial and space photovoltaics. Higher sensitivity under low dose rate observed from lead halide perovskite suggests a bright future of perovskite X-ray imaging system. Moreover, high on/off ratio and low energy consumption observed in resistive switching enable perovskite to be promising candidate for high density memristor.