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Carrier confinement and special crystallite dimensions in layered semiconductor colloids

1986; American Physical Society; Volume: 33; Issue: 8 Linguagem: Inglês

10.1103/physrevb.33.5953

1095-3795

C. J. Sandroff, D. M. Hwang, Woosang Chung,

Perovskite Materials and Applications

Microcrystallites of the layered semiconductor ${\mathrm{PbI}}_{2}$ were prepared in colloidal form and examined by transmission electron microscopy and optical absorption. The crystallites have lateral dimensions grouped around 12, 18, and 29 A\r{} corresponding to close-packed clusters with bulk ${\mathrm{PbI}}_{2}$ symmetry. Blue-shifted absorption features can be explained by carrier confinement in these differently sized crystallites, each a single layer (\ensuremath{\sim}7 A\r{}) thick.