The synthesis, X-ray structures and CVD studies of some group 11 complexes of iminobis(diisopropylphosphine selenides) and their use in the deposition of I/III/VI photovoltaic materials

Abstract

Reaction of NH(PⁱPr₂)₂ with elemental selenium in concentrated solvent conditions enables large scale preparation and improved yields of NH(PSeⁱPr₂)₂ that may be deprotonated with sodium methoxide to give NaN(PSeⁱPr₂)₂. Treatment of the sodium salt with appropriate Group 11 metal salts in methanol yields a range of trinuclear complexes. The protic solvent conditions utilized facilitate the reduction of copper(II) salts resulting in the isolation of copper(I) complexes. These new Group 11 complexes have been characterised by ¹H and ³¹P NMR and IR spectroscopy, APCI mass spectrometry, microanalysis and X-ray crystallography. Thermolytic decomposition of the copper(I) precursors in the presence of the indium precursor, In[(SePⁱPr₂)₂N]₂Cl, has been carried in the solid state using AA-MOCVD to give copper indium diselenide solid state materials CuInSe₂.