Publication date: 8th January 2019
Molybdenum oxide (MoOX) is a metal oxide material that gathers interesting features – such as proper energy alignment, stability and low parasitic absorption – for the use as a hole transport layer in photovoltaic devices, in special perovskite solar cells. In this work, a molybdenum oxide bronze (HXMoO3, in which 0.23 < X < 0.4; deep blue; orthorhombic [1]) was synthesized and employed as a precursor to the formation of MoOX thin films.
Isopropanol solutions of HXMoO3 were spin-coated onto ITO substrates and the produced thin films were further annealed for its conversion into MoOX, with oxygen vacancies for an effective n-type doping hence proper conduction [1]. Perovskite solar cells assembled with the as-prepared MoOX films (having the ITO/MoOX/TaTm/MAPI/C60/BCP/Ag architecture – apart from MoOX, all the other layers were thermally evaporated in vacuum) show Power Conversion Efficiencies as high as 17.5%, as similar to solar cells having thermally evaporated MoOX, proving the suitability of HXMoO3 as a MoOX precursor for the hole transport layer in efficient solar cells.
This work is supported by FAPESP.
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