Graphdiyne Oxide Modified NiOx for Enhanced Charge Extraction in Inverted Planar MAPbI3 Perovskite Solar Cells

Abstract

The interface defects and nickel vacancies of the NiOx lead to interface charge recombination, which limits its application in perovskite solar cells. Here, graphdiyne oxide(GDYO) was added to NiOx as an inorganic hole transporting material. It is found that the average carrier lifetime declined from 29.2 ns to 5.4 ns and the recombination resistance increased significantly after the GDYO adding determined by the time-resolved photoluminescence and electrochemical impedance spectroscopy analysis. We further demonstrated that the GDYO adding to NiOx effectively improved the charge extraction, accelerated the charge transportation and suppressed the charge recombination. Consequently, the optimized NiOx(GDYO)-based cell showed superior performance with a higher fill factor(81.99%) and improved stability with respect to the reference device. This method provides a new method for property regulation of NiOx in inverted planar MAPbI3 perovskite solar cells.