Graphene-CsPbBr3 quantum dots photodetectors with high responsivity

Abstract:

All-inorganic perovskites, such as CsPbX3 (X = Cl, Br, I), are gaining increasing attention due to their outstanding optoelectronic properties, especially their higher thermal stability comparing with organic-inorganic hybrid perovskites. However, CsPbX3-based photodetector demonstrated a relatively low responsivity due to the low carrier mobility of perovskite films. In this work, we synthesize CsPbBr3 quantum dots and construct a hybrid graphene-CsPbBr3 quantum dots photodetector with a responsivity of 3.5×104 A W-1, by introducing graphene as a transport layer. The unprecedented performance is attributed to the effective charge transfer and photogating effect, high mobility of graphene and prolonged carrier lifetime.