MARC details
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| fixed length control field |
05471ntm a22002537a 4500 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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201215b2014 a|||f mb|| 00| 0 eng d |
| 040 ## - CATALOGING SOURCE |
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| Original cataloging agency |
EG-CaNU |
| Transcribing agency |
EG-CaNU |
| 041 0# - Language Code |
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| Language code of text |
eng |
| Language code of abstract |
eng |
| -- |
ara |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER |
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| Classification number |
620 |
| 100 0# - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Ghada Hamdi Mohamed Ahmed |
| 245 1# - TITLE STATEMENT |
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| Title |
On the Development of Colloidal Quantum Dot Sensitized Solar Cell Architectures |
| Statement of responsibility, etc. |
Ghada Hamdi Mohamed Ahmed |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. |
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| Date of publication, distribution, etc. |
2014 |
| 300 ## - PHYSICAL DESCRIPTION |
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| Extent |
p. |
| Other physical details |
ill. |
| Dimensions |
21 cm. |
| 500 ## - GENERAL NOTE |
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| Materials specified |
Supervisor: Mohamed Sabry |
| 502 ## - Dissertation Note |
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| Dissertation type |
Thesis (M.A.)—Nile University, Egypt, 2014 . |
| 504 ## - Bibliography |
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| Bibliography |
"Includes bibliographical references" |
| 505 0# - Contents |
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| Formatted contents note |
Contents:<br/>Nanotechnology and solar energy<br/>Solar cells and photovoltaic generations<br/>First generation solar cells<br/>Second generation solar cells<br/>Third generation solar cells<br/>Organic solar cells <br/>Dye sensitized solar cells <br/>Quantum dot sensitized solar cells<br/>Structure and design<br/>Working mechanism <br/>Methods for fabrication of the QDSSC photoelectrodes <br/>Recently proposed Pseudo-SILAR solar paint<br/>Our Novel proposed physical mixing method<br/>QDSSC characterization and performance parameters<br/>Motivation and Literature Review<br/>Why Quantum dots as sensitizers? <br/>Multiple Exciton Generation<br/>. Cadmium Selenide (CdSe<br/>Zinc Oxide (ZnO<br/>An Overview of the Dissertation work<br/>CHAPTER 2: EXPERIMENTAL PROCEDURE AND CHARACTERIZATION<br/>Instrumentation<br/>The prepared nanomaterials<br/>Transmission Electron Microscopy (TEM<br/>Absorption and Fluorescence spectra<br/>X-ray Diffraction<br/>Thin film Characterization<br/>SEM<br/>Optical measurements of thin films<br/>The sensitized solar cells (Fabrication and Characterization Needed Devices<br/>2.2.3.1. Spin coater<br/>2.2.3.2. Muffle furnace for thin film annealing<br/>2.2.3.3. Keithley source meter<br/>2.2.3.4. Solar simulator<br/>2.3. Methodology<br/>2.3.1. Preparation of ZnO and Au-ZnO nanocones by microwave irradiation method<br/>2.3.2. Preparation of CdSe quantum dots by organometallic pyrolysis method<br/>2.3.3. Preparation of the polysulphide electrolyte<br/>2.3.4. Fabrication of ZnO or Au-ZnO/ CdSe based electrodes<br/>2.3.5. Detailed fabrication steps for mixed and layer-by-layer method<br/>CHAPTER 3: RESULTS AND DISCUSSION<br/>3.1. The Prepared nanomaterials (TEM, Absorption- photoluminescence, and XRD<br/>3.1.1. Characterization of ZnO nanopyramids<br/>3.1.2. Characterization of Au-ZnO nanopyramids<br/>3.1.3. Characterization of CdSe quantum dots<br/>3.2. The prepared thin films: (Optimization, Optical characterization and SEM<br/>3.2.1. Optimization<br/>3.2.2. SEM and surface morphology<br/>3.2.3. Optical measurements<br/>3.3. The constructed solar cells (Solar cell performance |
| 520 3# - Abstract |
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| Abstract |
Abstract:<br/>Quantum dot sensitized solar cells (QDSSCs) have attracted a widespread attention over<br/>the past few years as a prospects of fabricating highly efficient, low cost third generation<br/>photovoltaics. Quantum dots (QDs) –The light harvesting material in the solar cell– such<br/>as CdSe, CdTe and CdS exhibit size-dependent band gaps which offer great opportunities<br/>for harvesting light energy in the visible and infrared regions of the solar spectrum. In<br/>addition, due to impact ionization effect, it is possible to utilize hot electrons in QDs to<br/>generate multiple electron–hole pairs per photon of light absorption. These features give<br/>to QDSSCs the capability to achieve conversion efficiencies beyond the Shockley–<br/>Queisser limit, and provide a transformative improvement to traditional silicon<br/>photovoltaic cells.<br/>Currently available QDSSCs fabrication procedures utilize a series of deposition steps to<br/>achieve a better performing photoanode. Semiconductor film deposition and annealing<br/>techniques are time-consuming processes, requiring multiple steps and several days to<br/>achieve the best performing photoelectrode. In order to produce more functional and<br/>economically viable QDSSCs, it is important to simplify the electrode preparation<br/>techniques. Therefore, this study presents a novel method for casting the quantum dot<br/>onto the semiconductor based electrode by directly mixing the photoanode components<br/>together without a molecular linker, which offers easier scaling up process while<br/>maintaining a very low cost. This method was compared with layer-by-layer method and<br/>showed an improvement in the overall cell performance parameters.<br/>In addition, this work focuses on applying uniform-sized hexagonal pyramid-shaped ZnO<br/>and Au-ZnO nanoparticles for the first time in QDSSCs. The as-prepared nanoparticles<br/>possess excellent optical, catalytic and electrical properties. Furthermore, another Au<br/>nanoparticles layer/ZnO based QDSSC was constructed and compared with Au-ZnO<br/>hybrid structure in order to figure out the plasmonic effect of Au nanoparticles on the<br/>QDSSC light absorption behavior.<br/>xviii<br/>The results showed that the cells incorporating the Au nanoparticles layer/ZnO electrode<br/>exhibited the highest cell efficiency of = ~0.1% compared to other cells based on bare<br/>ZnO or Au-ZnO hexagonal nanopyramid-shaped. The results also suggest that metal<br/>nanoparticles (NPs) are potentially useful for improving the photoresponse in QDSSCs.<br/>However, for effective charge separation, these metal (NPs) should be isolated or<br/>separated from the wide band gap material and the sensitized material. |
| 546 ## - Language Note |
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| Language Note |
Text in English, abstracts in English and Arabic |
| 650 #4 - Subject |
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| Subject |
Nano- Science & Technology |
| 655 #7 - Index Term-Genre/Form |
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| Source of term |
NULIB |
| focus term |
Dissertation, Academic |
| 690 ## - Subject |
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| School |
Nano- Science & Technology |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Source of classification or shelving scheme |
Dewey Decimal Classification |
| Koha item type |
Thesis |
| 650 #4 - Subject |
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199 |
| 655 #7 - Index Term-Genre/Form |
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187 |
| 690 ## - Subject |
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199 |