scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Solution grown PbS nanoparticle films

15 Jan 2004-Applied Surface Science (North-Holland)-Vol. 221, Iss: 1, pp 43-47
TL;DR: In this article, the structure and size of PbS nanoparticles were characterized by X-ray diffraction and transmission electron microscopy (TEM) respectively, and decreases in dc-conductivity, Hall mobility and carrier concentration with reducing grain size were also examined.
About: This article is published in Applied Surface Science.The article was published on 2004-01-15. It has received 83 citations till now. The article focuses on the topics: Lead sulfide & Band gap.
Citations
More filters
Journal ArticleDOI
TL;DR: Ultraviolet irradiation was used to decompose a molecular single source precursor, yielding organic soluble approximately 2 nm sized nanoparticles with a narrow size distribution, which have a wurzite-type crystal structure with a copper-rich composition.
Abstract: The synthesis and characterization of ultrafine CuInS2 nanoparticles are described. Ultraviolet irradiation was used to decompose a molecular single source precursor, yielding organic soluble ∼2 nm sized nanoparticles with a narrow size distribution. UV−vis absorption, 1H and 31P{1H} NMR, and fluorescence spectroscopies and mass spectrometry were used to characterize decomposition of the precursors and nanoparticle formation. The nanoparticles were characterized by high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy energy dispersive X-ray spectroscopy, powder X-ray diffraction (XRD), electron diffraction, inductively coupled plasma analysis, UV−vis absorption spectroscopy, and fluorescence spectroscopy. They have a wurzite-type crystal structure with a copper-rich composition. The hypsochromic shift in their emission band due to quantum confinement effects is consistent with the size of the nanocrystals indicated in the HRTEM and XRD analyses.

182 citations

Journal ArticleDOI
TL;DR: In this paper, lead sulphide (PbS) thin films have been deposited on glass slide substrates via a simple and easily controlled method, proceeding large area films, using the chemical bath deposition technique.

171 citations

Journal ArticleDOI
TL;DR: In this paper, a cubic nanocrystalline PbS phase formation was found in the polyvinyl alcohol (PVA) matrix on glass substrates by chemical bath deposition at and below room temperature (30°C).
Abstract: 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 °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.

97 citations

Journal ArticleDOI
TL;DR: In this paper, the optical losses in the cell structure reduced the optical band gap (Eg) of Bi2S3 (160mm) and PbS (400mm) thin films.

88 citations

Journal ArticleDOI
TL;DR: In this article, lead sulfide (PbS) nanocrystallites have been successfully synthesized using chemical bath deposition (CBD) method, which were finally characterized for structural and optical properties.

82 citations

References
More filters
Journal ArticleDOI
R.L. Anderson1
TL;DR: In this article, the electrical characteristics of Ge-GaAs heterojunctions, made by depositing Ge epitaxially on GaAs substrates, are described and I-V and electro-optical characteristics are consistent with a model in which the conduction-and valence-band edges at the interface are discontinuous.
Abstract: The electrical characteristics of Ge-GaAs heterojunctions, made by depositing Ge epitaxially on GaAs substrates, are described. I–V and electro-optical characteristics are consistent with a model in which the conduction- and valence-band edges at the interface are discontinuous. The forbidden band in heavily doped (n-type) germanium appears to shift to lower energy values.

970 citations

Journal ArticleDOI
TL;DR: In this article, the authors developed two theoretical models, including the effect of band nonparabolicity, that successfully explain the observed size dependence down to about 25 A. The electron-hole-in-a-box model with effective mass approximation cannot explain the observation size dependence.
Abstract: The transition of PbS from molecular to bulk form has been observed in polymer films. As the particle size decreases the band gap shifts to the blue and eventually approaches the transition energy of the first allowed excited state, X→A, of a PbS molecule. Discrete absorption bands also appear. The electron‐hole‐in‐a‐box model with effective mass approximation cannot explain the observed size dependence. We have developed two theoretical models, both including the effect of band nonparabolicity, that successfully explain the observed size dependence down to about 25 A.

787 citations

Journal ArticleDOI
TL;DR: In this article, the effects of particle sizes in the nanometer range on the phase transition of PbS were investigated using energy-dispersive x-ray diffraction of synchrotron produced wiggler radiation.
Abstract: At elevated pressure, PbS undergoes a first order phase transition from the NaCl or B1 structure to an orthorhombic structure. The effects of particle sizes in the nanometer range on this transition have been investigated using energy‐dispersive x‐ray diffraction of synchrotron produced wiggler radiation. Relative to the bulk crystals, the onset of transition pressure showed a significant increase with decreasing particle size. The results also show that compressibility increases with decreasing particle size: this increase is continuous through the phase transition.

135 citations

Journal ArticleDOI
TL;DR: In this paper, the interrupted island growth was applied to form PbS nanocrystallites in a dielectric SiO 2 host by a two source-evaporation technology.

95 citations

Journal ArticleDOI
TL;DR: In this paper, a self-assembled heterojunction was fabricated by means of an electrochemical deposition of PbS nanoparticles on indium tin oxide substrate, and the currentvoltage and capacitance-voltage studies confirmed the formation of a heterjunction.
Abstract: Self-assembled heterojunction was fabricated by means of an electrochemical deposition of PbS nanoparticles on indium tin oxide substrate. The current–voltage and capacitance–voltage studies confirmed the formation of a heterojunction. A large current and large capacitance were observed in the case of a device from particle of smaller size which is believed to be due to the large surface area contact. The rectifying behavior of the heterojunction was found to be weak as compared to the usual p–n junction.

33 citations