Optical properties of PbS

Kanazawa, Hideyuki; Adachi, Sadao

doi:10.1063/1.367466

Cited by 78 publications

(38 citation statements)

References 13 publications

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“…Equation 6 shows that it can strongly modify the absorption of a material when it is dispersed as small particles in a host with a different dielectric function (this is a consequence of dielectric confinement). 31,32 Using bulk values for the PbS dielectric function at 400 nm ( R ϭ 4.53, I ϭ 26.4) 33 and the tetrachloroethylene (C 2 Cl 4 ) refractive index (n s ϭ 1.53), 34 eq 6 yields a sizeindependent 400 ϭ 1.71 ϫ 10 5 cm Ϫ1 (Figure 5b, full line). Using the theoretical 400 , we find the following theoretical expression for the molar extinction coefficient: 400 ϭ 0.0234d 3 cm Ϫ1 / M. Clearly, both 400 and 400 are in excellent agreement with the experimental data.…”

Section: Resultsmentioning

confidence: 99%

Size-Dependent Optical Properties of Colloidal PbS Quantum Dots

et al. 2009

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We quantitatively investigate the size-dependent optical properties of colloidal PbS nanocrystals or quantum dots (Qdots) by combining-the Qdot absorbance spectra with detailed elemental analysis of the Qdot suspensions. At high energies, the molar extinction coefficient epsilon increases With the Not volume d(3) and agrees with theoretical calculations using the Maxwell-Garnett effective medium theory and bulk values for the Qdot dielectric function. This demonstrates that quantum confinement has no influence on E in this spectral range, and it provides an accurate method to calculate the Qdot concentration. Around the band gap, epsilon only increases with d(1.3), and values are comparable to the epsilon of PbSe Qdots. The data are related to the oscillator strength f(if) of the band gap transition and results agree well with theoretical tight-binding calculations, predicting a linear dependence of f(if) on d. For both PbS and PbSe Qdots, the exciton lifetime tau is calculated from f(if). We find values ranging between 1 and 3 mu s, in agreement with experimental literature data from time-resolved luminescence spectroscopy. Our results provide a thorough general framework to calculate and understand the optical properties of suspended colloidal quantum dots. Most importantly, it highlights the significance of the local field factor in these systems

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Section: Resultsmentioning

confidence: 99%

Size-Dependent Optical Properties of Colloidal PbS Quantum Dots

et al. 2009

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“…Lead sulphide (PbS) is an important IV-VI narrow direct band gap semiconductor material having approximate band gap of 0.41 eV at 300k and a large exciton Bohr radius of 18 nm [1,2].These properties make PbS very suitable for infrared detection application [3]. This material has also been used in many fields such as photography [4], Pb 2+ ionselective sensors [5], optical switches and solar absorption [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Molarity on Structural and Optical Properties of Chemically Deposited Nanocrystalline PbS Thin Film

Sarma

Wary

2017

ILCPA

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Abstract. Thin films of PbS were deposited by chemical bath deposition (CBD) method under various molarities using lead acetate as Pb 2+ ion source, thiourea as S 2-ion source and ammonia as complexing agent at a fixed pH value of 9 under bath temperature of 333 K. Four different molarities of PbS thin films were prepared. The as-prepared films were characterized by using X-ray diffraction (XRD), X-ray fluorescence (XRF), EDX, field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). Parameters like crystallite size, lattice constant, microstrain, dislocation density were calculated. Optical constants such as extinction coefficient, absorption coefficient were measured from absorption spectra. Studies show that average nanocrystallite size increases from14.2 nm to 18.1 nm as the molarity of the film increases. Optical studies reveal the decrease of band gap from 1.75 eV to 1.44 eV with increasing molarity of the film indicating higher electrical conductivity of the films.

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“…PbS is an important A 4 B 6 semiconductor material, with a bandgap of 0.42 eV at room temperature [1]. This corresponds to a threshold wavelength for photoconductivity of about 3000 nm, which makes the material very attractive for photoconductor detectors operating in the visible and near infrared range of the spectrum (400-3000 nm) [2,3].…”

Section: Introductionmentioning

confidence: 99%