Low-temperature preparation of crystallized graphite nanofibers for high performance perovskite solar cells

Abstract

Integration of two-dimensional graphite nanosheets into one-dimensional graphite nanofibers is essential for deep application of graphite materials. Here, we report preparation of crystallized graphite nanofibers by nozzle-less electrospinning and subsequent low-temperature heat treatment (500 °C). Depending on this graphitized one-dimensional nanostructure, we first apply the graphite nanofibers as scaffold for perovskite solar cells (PSCs), which would provide a charge transfer highway in the light absorb layer and then improve the performance of devices. A high power conversion efficiency of 18.23% was recorded for the graphite nanofibers based PSC with high fill factor of 76%.