Preparation of colloidal lead sulfide nanoparticles by laser ablation in water for optoelectronic devices applications

作者：Ismail Raid A^*

来源：High Energy Chemistry, 2015, 49(1): 58-63.

DOI：10.1134/S0018143915010051

In present work, lead sulfide PbS nanoparticles NPs are synthesized by laser ablation of lead sulfide target in double distilled water using 0.532 and 1.064 mu m wavelengths. The transmission electron microscopy TEM, atomic force microscopy AFM and X-ray diffraction XRD were used so as to determine the shape, size, distribution, and structure of the nanoparticles prepared with different laser wavelengths. X-ray diffraction results confirmed that the lead sulfide nanoparticles crystallized in the cubic phase and presents a preferential orientation along (200) plane and with no observation of any incomplete phases. Optical band gap values of 1.9 and 2eV for the lead sulfide nanoparticles were determined by UV-Vis absorption measurements. It was found that the morphology and size of PbS NPs depend on laser wavelength. To check the possibility of synthesised nanoparticles for optoelectronic devices, a novel type of solution-processed hetero-junction photodetector, prepared by drop cast film of colloidal lead sulfide nanoparticles NPs onto n-type single crystal silicon wafer was demonstrated. The effect of laser wavelength on the electrical characteristics and photosensitivity of p-PbS/n-Si heterojunction has been investigated.

• 出版日期2015-1