Fabrication and Characterization of SnO2-MoS2 based nano-composite electron transport layer for Perovskite Solar Cell /

Abstract

Electron transport layer (ETL) plays a crucial role in the performance of perovskite solar cell (PSC). Charged with the task of electron extraction and delivering them to their respective electrode, they play a vital role in enhancing the overall performance of the solar cell (SC). A number of materials, particularly metal oxide (MO) and their composites have been tested for this role. Tin Oxide (SnO2) and its composites have shown superior properties that have proven crucial for enhancing the performance of SC by improving the charge extraction properties of the layer. Therefore, this paper presents the study of composite of SnO2 with the pristine nano flakes of Molybdenum Disulfide (MoS2), a new emerging material for SC application. The addition of 20% (v/v%) MoS2 in SnO2 has not only improved the crystallinity of SnO2 but also resulted in enhanced and larger grain size for perovskite absorber layer. In addition to this, the flakes also cause an increase in charge carrier concentration and conductivity of the film. Furthermore, due to the incorporation of flakes the charge carrier kinetics at the ETL/perovskite interface was also reduced leading to lower recombinations and improved charge transport at the interface indicating that the SnO2 and MoS2 composite will be a suitable option as an ETL for development of PSC