| 초록 |
Different foams of silicon (Si) nanostructures, such as free standing silicon nanoparticles, quantum dots, nano wires, and nanorods have been attracted large interest due to its unique chemical, electrical and opto-electronic properties. There are many potential applications of silicon nanostructures, such as opto-electronic switches, LEDs, lasers, solar cells, single-electron transistors, and bio-imaging devices. In this study, Crystalline silicon nanoparticles (size ＜5 nm) are synthesized at room temperature by the decomposition of silicon sulfide (SiS2) in a water–acid mixture followed by chemical etching. Grey freestanding silicon nano particles are obtained after the decomposed product is etched with a mixture of hydrofluoric acid (HF), hydrogen peroxide (H2O2) and ethanol. These silicon nanoparticles are not capped with any organic ligands, making them suitable for electronic applications. For the preparation of a functional Si nanoparticle dispersion, the silicon nanoparticle suspension is prepared by redispersing in benzonitrile or in ethanol by incorporating polypropylene glycol (PPG) as a binder. An Al/Si-nanoparticle/n++-Si back-to-back Schottky diode is fabricated from both the Si nanoparticle suspension and the ink, and the charge transport mechanism is studied as the working temperature increases. Such versatility of these silicon nanoparticles can be ideal for any print-type deposition with a low-cost and large-area processing method. Details will be presented on poster section. |
