Graphene derivatives have been intensively investigated as the electron transporting layer and conductive electrodes in perovskite optoelectronic devices. In this work, reduced graphene oxide (RGO) dispersed in nonpolar solvent was achieved by surfactant assisted phase transfer method. The hybrid perovskite/RGO film was prepared by antisolvent treatment. The volume ratio between perovskite and RGO solution is an important parameter that affects the perovskite device performance. The optimal ratio is 1:10 in perovskite photodetector owing to the high photocurrent and on/off ratio. However, lower or larger ratio would result in insufficient charge transfer or short circuit respectively. The spatially and temporally resolved measurements reveal the detailed charge transfer and transport process in the perovskite and RGO blends. RGO coupled with perovskite not only promotes charge transfer, but serves as the transport pathways, resulting in the improved performance of the device.

石墨烯衍生物已经作为钙钛矿光电器件中的电子传输层和导电电极进行了深入研究。在这项工作中，通过表面活性剂辅助相转移方法获得了分散在非极性溶剂中的还原氧化石墨烯（RGO）。通过抗溶剂处理制备钙钛矿/ RGO杂化膜。钙钛矿和RGO溶液之间的体积比是影响钙钛矿设备性能的重要参数。由于高的光电流和开/关比，钙钛矿光电探测器的最佳比例为1:10。然而，较低或较大的比率将分别导致不足的电荷转移或短路。时空分辨的测量结果揭示了钙钛矿和RGO混合物中详细的电荷转移和传输过程。