One‐Step Synthesis and Deposition of Metal Oxides: NiO Quantum Dots as a Transport Layer for Perovskite Photovoltaics

One‐step synthesis and deposition of nickel oxide quantum dots using a gas‐phase microplasma process is demonstrated and their applicability as a transport layer for solar cell devices is shown. The process uses a solid nickel metal wire as sacrificial electrode, and the concentration of oxygen gas required in the synthesis is investigated. The quantum dots are characterized for physical, chemical, and optical properties and critical process parameters such as the process throughput are also estimated. Direct one‐step deposition directly on perovskite solar cells is carried out using a computer‐controlled x–y stage and the performance of the solar cell device is assessed. Herein, rapid and single‐step deposition of nickel oxide quantum dots (NiO QDs) through gas‐phase microplasma process in ambient air with Ni wire as main precursor is presented. The physical and chemical properties are showcased here. Especially, the application of direct deposition of NiO QD film as transport layer for perovskite‐based solar cell devices is studied.