Lead halide perovskite capped colloidal Nanocrystal ; synthesis, surface modification, and charge transport

Abstract

Recently, In field of nanoparticles research, as developing shape control skill, nanoparticles could be given to chance to many applications. Especially semiconducting nanoparticles can apply to diverse fields such as solar cell, transistor, light emitting easily as exploiting nanoparticles. Nanoparticles have specific different properties which related to charge transport by controlling their size or shape of nanoparticles than bulk materials due to become close to packing the nanoparticles on the substrate and smaller than bulk in exciton Bohr radius. Commonly, by increasing nanoparticles size, that can affect to their excited number and low activation energy decrease result in increasing charge transport. We investigated ligand-type exchanged from organic to inorganic to improve charge transfer intensively, besides, improved charge transfer can be influenced by the their ligand length which can be controlled capped from parti-cles size and shape that is distinction of property . Generally, when nanoparticles will be increasing size that easy to connect each other for electron in lattices distance which be given to decrease the hopping number. In order to overcome barriers for jumping electrons in lattice distance, the electron's energy have to absorb high energy so Perovskite materials will help electron mobility in nanoparticle.In this study, firstly, we have synthesized organic capped with PbS, PbSe nanoparticles which is size ~8nm, and then, exchange ligand from organic to inorganic capped with nanoparticles. Secondly, Perovskite was dissolved in different solvent because we want to exploit solvent effect. ⓒ 2015 DGIST