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Characterization of Secondary Created Structures in PN Junctions of Silicon Solar Cells
Šicner, Jiří ; Číp, Ondřej (referee) ; Navrátil, Vladislav (referee) ; Koktavý, Pavel (advisor)
This thesis describes the study and characterization of secondary created structures in PN junction of silicon solar cells. Secondary created structure is the term which means the structures created for the purpose of suppressing the negative influence of local defects and edges of the solar cell. This means in particular laser notches used to isolate the edges. Furthermore, the secondary created structure means modification defective area using focused ion beam milling. Theoretical part of this work deals with short introduction to the topic of solar cells. There are mentioned the physical nature of the solar cell and the technology associated with the issue of solar cells. Experimental section begins with a description of the experimental methods. For diagnostic methods were used both electrical (UI characteristics, noise characteristics) and optical methods (measuring local radiation - CCD camera, thermal imager, lock-in thermography). Furthermore, there was also used a scanning electron microscope (SEM) equipped with technology using Focused Ion Beam (FIB). Sequentially there are presented individual results of characterization of created structures by laser. These partial results are incorporated into a comprehensive methodology developed for characterizing laser-created structures. The experimental part is finished by a presentation of the results of the research use of focused ion beam technology for sputtering defective areas of solar cells.
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Thermo-electric solar generator
Kočvárek, Ondřej ; Jakubová, Ivana (referee) ; Gregor, Jan (advisor)
The introduction of this work is devoted to the description of physical principals and condtruction of modern semiconductor thermoelectric transformers. This work describes thein basic characters and the most commonly used materials for thein production. Further, it mentions the basic principals and physical effects that describe the thermoelectric conversion of energy and the nondestructive method for establishing the basic material characteristics of thermoelectric transformers. The substantiv part of this work is the measuring of the material’s characteristics of the accessible thermoelectric elements through the medium of experimental measuring network. The optimal construction of thermoelectric solar generators used for individual thermoelectric elements are designed based on the taken measurements and the evaluation of material’s characteristics of the observed thermoelectric elements.
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Using thermochromic systems for testing heat distribution
Klimeš, Jan ; Sedlaříková, Marie (referee) ; Zatloukal, Miroslav (advisor)
This thesis deals with principles of thermochromism and its possible applications in heat distribution testing. Theoretical part describes mechanisms which allow the thermochromic properties of the substances. Particular attention is paid to cholesteric liquid crystals. Ability to measure the heat for this type of liquid crystals was varified. Also long service life in high humidity environment, enviroment with intense UV radiation, cyclic changes in temperature or immersion in water was tested. A possibility of their practical use in diagnosis was verified as well. Specifically mapping of heat distribution on an assembled PCB. Conclusion contains comparison and evaluation of this method in terms of accuracy, user comfort and economic advantages compared to conventional infrared sensors.
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Using thermochromic systems for testing heat distribution
Klimeš, Jan ; Sedlaříková, Marie (referee) ; Zatloukal, Miroslav (advisor)
This thesis deals with principles of thermochromism and its possible applications in heat distribution testing. Theoretical part describes mechanisms which allow the thermochromic properties of the substances. Particular attention is paid to cholesteric liquid crystals. Ability to measure the heat for this type of liquid crystals was varified. Also long service life in high humidity environment, enviroment with intense UV radiation, cyclic changes in temperature or immersion in water was tested. A possibility of their practical use in diagnosis was verified as well. Specifically mapping of heat distribution on an assembled PCB. Conclusion contains comparison and evaluation of this method in terms of accuracy, user comfort and economic advantages compared to conventional infrared sensors.
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Characterization of Secondary Created Structures in PN Junctions of Silicon Solar Cells
Šicner, Jiří ; Číp, Ondřej (referee) ; Navrátil, Vladislav (referee) ; Koktavý, Pavel (advisor)
This thesis describes the study and characterization of secondary created structures in PN junction of silicon solar cells. Secondary created structure is the term which means the structures created for the purpose of suppressing the negative influence of local defects and edges of the solar cell. This means in particular laser notches used to isolate the edges. Furthermore, the secondary created structure means modification defective area using focused ion beam milling. Theoretical part of this work deals with short introduction to the topic of solar cells. There are mentioned the physical nature of the solar cell and the technology associated with the issue of solar cells. Experimental section begins with a description of the experimental methods. For diagnostic methods were used both electrical (UI characteristics, noise characteristics) and optical methods (measuring local radiation - CCD camera, thermal imager, lock-in thermography). Furthermore, there was also used a scanning electron microscope (SEM) equipped with technology using Focused Ion Beam (FIB). Sequentially there are presented individual results of characterization of created structures by laser. These partial results are incorporated into a comprehensive methodology developed for characterizing laser-created structures. The experimental part is finished by a presentation of the results of the research use of focused ion beam technology for sputtering defective areas of solar cells.
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Thermo-electric solar generator
Kočvárek, Ondřej ; Jakubová, Ivana (referee) ; Gregor, Jan (advisor)
The introduction of this work is devoted to the description of physical principals and condtruction of modern semiconductor thermoelectric transformers. This work describes thein basic characters and the most commonly used materials for thein production. Further, it mentions the basic principals and physical effects that describe the thermoelectric conversion of energy and the nondestructive method for establishing the basic material characteristics of thermoelectric transformers. The substantiv part of this work is the measuring of the material’s characteristics of the accessible thermoelectric elements through the medium of experimental measuring network. The optimal construction of thermoelectric solar generators used for individual thermoelectric elements are designed based on the taken measurements and the evaluation of material’s characteristics of the observed thermoelectric elements.
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