Electrochemically Controllable Preparation Of MoO_x Film And The Application As Hole Transport Material In Solar Cells

Non-stoichiometric transition metal oxides(TMOs)have received considerable attention because of their excellent optic and electric properties for novel high performance opto-electronic devices or photocatalysis,among which nonstoichiometric MoO_x(2?x?3)has been one promising candidate in novel solar cells such as perovskite solar cells because of its non-toxicity,broad bandgap and deep electronic state.However,few studies have been focused on the evolution of its morphology,composition and microstructure under varios controlling parameters and ambient conditions,which has limited its real application in different devices.In this disseration,we have devoped and studied a novel controllable electrochemical fabrication method for uniform and smooth nonstoichiometric MoO_x thin film.Its stoichiometry,morphology and microstructures can be effectively controlled by simple physical/chemical parameters,and induce changes in the density of oxygen vacancy,surface roughness and crystallinity,respectively.Such modification could further influence its opto-electric properties and play important role in various devices such as hybrid organic-inorganic perovskite solar cells.As a preliminary result,a 9.20%efficiency can be achieved without any additional treatments(e.g.,chemical doping and interfacial engineering),which can be further improved with optimization on transparency etc.What's more,the hydrophilicity/hydrophobicity of this MoO_x can be significantly tuned by changing in simple parameters,and applied in various aspects such as detectors,novel solar cells and photocatalysis.