Formation of Perfect Superlattice with Aligned Plane Orientation of Colloidal PbS Quantum Dots

Abstract

We investigated the method to form a perfect quantum dot (QD) superlattice, in which each QD has the same plane orientation, by the deposition of colloidal PbS QDs with clear facets in solution. QD facets were controlled by synthesis temperature. We found that the slower the deposition, the better the orientation alignment of QDs. The energy conversion efficiency of solar cell is expected to be improved with perfect QD superlattice by its high carrier mobility in intermediate bands.