The talk will present the chemical bath deposition pathway to “chemical epitaxy”, which refers to the growth from solution of monocrystalline semiconductor thin films with well-defined orientation relations with respect to the substrate. Examples will be given for several systems, while describing the effect of deposition parameters on film morphology and resulting optical properties in the short wave infrared range. The second part of the talk will present the synthesis of highly uniform surfactant capped semiconductor nanoparticles, with emphasis on the role of ‘beneficial impurities’ in controlling shape and aspect ratio.