Article

Characterization of PbS nanoparticles synthesized by chemical bath deposition

Journal of Alloys and Compounds (Impact Factor: 3). 09/2009; 484(1-2):463-466. DOI: 10.1016/j.jallcom.2009.04.127

ABSTRACT

Lead sulfide (PbS) nanocrystallites have been successfully synthesized using chemical bath deposition (CBD) method. The films were deposited by ion by ion mechanism on glass substrate, which were finally characterized for structural and optical properties. The average particle size calculated by XRD is found to be 40 nm. The optical band gap is found to be 2.0 ± 0.1 eV which is higher than the bulk. SEM micrographs show that spherical nanoparticles are formed.

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Available from: Diwaker Kumar
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    • "Among the IV-VI semiconductors, PbS thin films have been used in a lot of applications, including electronic and optoelectronic devices [1] [2] [3]. PbS is an important direct narrow gap semiconductor material with band gap energy of 0.4 eV and has a cubic lattice with unit cell face center cube [4] [5] [6]. "

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    • "It has a small effective mass of charge carriers and a high value of dielectric constant [7]. PbS has a large exciton Bohr radius (18 nm) due to which quantum confinement effect is observed even for PbS with relatively large particle size [8]. By varying the size and shape of PbS nanoparticles, it has been possible to tune their band gap from 0.3 eV to 5.2 eV [9] [10]. "
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    • "We found that E_g decreased from 2.2 to 1.2 eV as deposition time was increased due to the increase in particle sizes. This finding concurs with those of other authors [3] [4] . The variation in E_g in relation to deposition time is summarized in Table 2. "
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