Nickel oxide nanoparticles, dispersions, thin films, and photoelectric conversion elements

Abstract

[Objective] The objective is to provide a photoelectric conversion element comprising titanium oxide nanoparticles that achieve excellent power conversion efficiency (PCE), a dispersion containing the nanoparticles, a thin film containing the nanoparticles, and a hole transport layer containing the nanoparticles. [Solution] The nanoparticles of this invention are nickel oxide nanoparticles, characterized by a particle size of less than 20 nm and a resistivity of less than 2.0 × 10⁵ Ω·cm. The nanoparticles of this invention preferably have a transmittance of over 90% in the wavelength range of 380 nm to 400 nm. The nanoparticles of this invention are preferably used in the hole transport layer of a perovskite solar cell.

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