in neat (no solvent) PbS annealed in oxygen atmosphere above 900 K; air quenched to room temp.; detd. by X-ray diffraction and X-ray photoelectron spectroscopy;
film preparation by thermal co-evapn. of metals out od two resistively heated Ta ovens onto kapton substrate kept at fixed temp. in range 7-300 K (pressure during deposition at 5E-8 Torr);
参考文献
Journal of Physics: Condensed Matter, , vol. 7, p. 8437 - 8444
