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Synthesis, Optical And Photoelectrical Investigations On PbS nano-,micro-structures

Electronic Theses of Indian Institute of Science

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Title Synthesis, Optical And Photoelectrical Investigations On PbS nano-,micro-structures
 
Creator Pendyala, Naresh Babu
 
Subject Lead Sulfide - Nano technology
Lead Sulfide - Synthesis
Lead Sulfide Nanostructures
Lead Sulfide Quantum Dots - Synthesis
Lead Sulfide Quantum Dots - Photoluminescence
Lead Sulfide Nano Micro-crystallites - Photoluminescence
Lead Sulfide Quantum Dots - Ion Sensing
PbS Nanoparticles
PbS Quantum Dots
Poly Vinyl Alcohol
PbS Nanostructures
PbS Nano-, Micro-structures
PbS Dendrite Structures
Nanotechnology
 
Description The thesis describes the synthesis of PbS nano-, micro-structures by colloidal and hydrothermal techniques. Size and morphology dependent luminescence studies were carried out in detail. Application oriented studies like ion sensing and modulation of luminescence are carried out on colloidal PbS QDs. Photoelectrical studies are carried out on various morphologies of PbS microstructures. We observe the persistent photoconductivity, growth and quenching of photocurrent, and a few novel phenomena in flower shaped PbS microstructures. This work is presented in eight chapters inclusive of summary and directions for future work.
CHAPTER 1 provides a brief introduction to optical and photoelectrical properties of semiconductor quantum dots and hydrothermal technique in preparation of quantum structures. A review of PbS nanostructures and its technological applications are discussed.
CHAPTER 2 provides the experimental techniques used in this work. First, the synthesis of PbS nano-, micro-structures by various methods, and characterization tools used in this work are briefly presented.
CHAPTER 3 deals with the synthesis of PbS quantum dots in poly vinyl alcohol with various precursor concentrations to identify the surface states by temperature dependent photoluminescence (PL) measurements. Average bandgap value calculated from absorption measurements was 2.1 eV. We have observed that high-energy PL bands (>1.3 eV) are due to electron traps (Pb dangling bonds) and low-energy bands (
 
Contributor Koteswara Rao, K S R
 
Date 2010-10-21T05:53:48Z
2010-10-21T05:53:48Z
2010-10-21
2009-04
 
Type Thesis
 
Identifier http://etd.iisc.ernet.in/handle/2005/921
 
Language en_US
 
Relation G23059