Photovoltaic Properties of CdSe/CdS and CdS/CdSe Core–Shell Particles Synthesized by Use of Uninterrupted Precipitation Procedures

摘要: Cadmium Selenide (CdSe) and cadmium sulfide (CdS) are good electron acceptors for hybrid solar cells. CdSe CdS nanoparticles can be prepared at low temperatures (60–80°C) from alkaline aqueous solutions of a salt, sodium citrate, thiourea, as sulfur source, or selenosulfate, selenium source. Under the same experimental conditions, reaction kinetics were faster than CdSe. Formation CdSe/CdS core–shell particles (type I: core shell) could achieved by use an uninterrupted one-step process setting high solution shell compounds, respectively. The yield product was higher pH 8.5–9.5 whereas that (10–11). Therefore, formation “inverse” CdS/CdSe structure II: possible in choosing lower shell. Photoluminescence spectra micrographs confirmed two types particle. photovoltaic performance heterojunctions with poly(3-hexylthiophene) (P3HT), also suggested particles. Both photovoltage photocurrent density cells depended on compound not core. It shown interface plays is important cell applications, its modification realized incorporating different compounds