title: Three-dimensional self-assembly of chalcopyrite copper indium diselenide nanocrystals into oriented films.
abstract: CuInSe2, which is one of the highest efficiency thin-film solar cell active layer materials, has been an attractive target for nanocrystal synthesis and manipulation. Here, we report unprecedented, simultaneous control of the synthesis and self-assembly behavior of CuInSe2 nanocrystals. These nanocrystals are solution-processable, monodisperse tetragonal bipyramids that exhibit photoconductivity and self-assemble into crystallographically oriented thin films. Structural characterization indicates that these nanocrystals are tetragonal phase, as is used in high-efficiency, second-generation, thin-film solar cells. Elemental analysis indicates that approximately 1:1:2 Cu/In/Se stoichiometry can be achieved, and that the elemental composition can be adjusted from copper-rich to indium-rich with reaction time.
authors: Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
authors: Danielle C
authors: DC
authors: Reifsnyder
authors: Xingchen
authors: X
authors: Ye
authors: Thomas R
authors: TR
authors: Gordon
authors: Chengyu
authors: C
authors: Song
authors: Christopher B
authors: CB
authors: Murray