Optical and dielectric properties of PVA capped nanocrystalline PbS thin films synthesized by chemical bath deposition

被引：99

作者：

Jana, S. ^{[1
]}

Thapa, R. ^{[1
]}

Maity, R. ^{[1
]}

Chattopadhyay, K. K. ^{[1
,2
]}

机构：

[1] Jadavpur Univ, Dept Phys, Thin Films & Nanosci Lab, Kolkata 700032, India

[2] Jadavpur Univ, Nanosci & Technol Ctr, Kolkata 700032, India

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 40卷 / 10期

关键词：

nanocrystalline PbS; chemical bath deposition; dielectric properties; optical properties;

D O I：

10.1016/j.physe.2008.04.015

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanoparticles of lead sulfide (PbS) have been grown within the pores of polyvinyl alcohol (PVA) matrix on glass substrates by chemical bath deposition at and below room temperature (30 degrees C). Lead acetate and thiourea, dissolved in an alkaline medium, were taken as the sources of lead and sulfur. X-ray diffraction and selected area electron diffraction studies confirmed the cubic nanocrystalline PbS phase formation. Transmission electron micrograph of the films revealed the particle size lying in the range 10-20 nm. X-ray photoelectron spectroscopic studies confirmed the presence of lead and sulfur in the films, and their atomic ratios were found to be dependent on the deposition temperature. UV-vis spectrophotometric measurement showed a direct allowed band gap lying in the range 2.40-2.81 eV, which is much higher than the bulk value (0.41 eV). The band gap decreases with the increase of deposition temperature. The dielectric constant of the PVA-capped nanocrystalline PbS was in the range 155-265 at higher frequencies, which is much higher compared to only PVA and bulk PbS. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：3121 / 3126

页数：6

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