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Delafossites like CuGaO2 have appeared as promising p-type semiconductormaterials for opto-electronic applications mainly due to their high opticaltransparency and electrical conductivity. However, existing synthetic effortsusually result in particles with large diameter limiting their performancerelevant to functional electronic applications. In this article, we report anovel surfactant-assisted hydrothermal synthesis method, which allows thedevelopment of ultrafine (~5 nm) monodispersed p-type CuGaO2 nanoparticles(NPs). We show that DMSO can be used as a ligand and dispersing solvent forstabilizing the CuGaO2 NPs. The resulting dispersion is used for thefabrication of dense, compact functional CuGaO2 electronic layer withproperties relevant to advanced optoelectronic applications. As a proof ofconcept, the surfactant-assisted hydrothermal synthesized CuGaO2 isincorporated as a hole transporting layer (HTL) in the inverted p-i-nperovskite solar cell device architecture providing improved hole carrierselectivity and power conversion efficiency compared to conventional PEDOT:PSSHTL based perovskite solar cells.

materials today energy

Employing surfactant-assisted hydrothermal synthesis to control CuGaO2  nanoparticle formation and improved carrier selectivity of perovskite solar  cells