By using Doctor Blade Method, Lithium and Magnesium Co-Doped with Nickel Oxide Thin Film as Charge Transport Layer for Inorganic Perovskite Solar Cell

Abstract

The organic materials for hole transport layer HTL such as PEDOT: PSS and Spiro-OMeTAD are poor electron blockers, more expensive, unstable, and large charge recombination materials. The inorganic material such as nickel oxide and copper oxide thin film for hole transport layer HTL was used to enhance the fill factor FF, power conversion efficiency PCE and stability of the hole transport layer for inorganic perovskite solar cell. Lithium and Magnesium co-doped with nickel oxide nanoparticles deposited on indium doped tin oxide ITO glass then deposited the cesium lead iodide bromide layer by using doctor blade method then characterize this thin film for confirmed the properties of the materials.

The crystal structure of nickel oxide was measured from XRD and all the peaks were matched with JCPDS cards. The average crystalline size was 24 nm has cubic in shape. For optical properties and bandgap measured, using UV visible and DRS confirmed the strong absorbance near to the visible range, and bandgap decreased from 3.7 to 3.4 eV by adding doping. After the deposition of the inorganic perovskite layer, the bandgap decreased from 3.09 eV to 2.56 eV. RBS confirmed the chemical composition, impurity, and thickness of the thin film. The IV curve measurement showed the 4.3 % efficiency of the pure nickel oxide thin film, by adding the doping of lithium and magnesium in nickel oxide thin film showed the 7.65 % efficiency with the 83 % fill factor FF.