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Materials for organic electronics
Skrášek, Martin ; Zmeškal, Oldřich (referee) ; Vala, Martin (advisor)
The work contains literature search on organic electronics, especially organic solar cells. There is described in detail their principle of function and used materials. Also there are mentioned possibilities of synthesis of conjugated systems for this applications and methods of their structural, optical and electrical characterization. In experimental section and discussion is introduced synthesis of five new, various substituted derivates of benzylidenaniline and their characterisation together with another seven derivates, whose synthesis has been described in bachelor thesis. There is investigated influence of substituents to chemical shift of hydrogen on imine bridge and to position of absorption peaks in UV-Vis spectra. There also has been found method for fabrication of thin layers and solar cells with bulk heterojunction have been fabricated. Next, V-A characteristics and impedance spectra of the cells were recorded. According to obtained results, investigated systems act as photodiodes and in case of three derivates the photoinduced increase of electric current has been observed. But for application in solar cells it is necessary to shift the position of absorption spectra towards longer wavelengths.
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Synthesis and properties evaluation attempts in new highermolecular conjugated systems applied for optoelectronics.
Skrášek, Martin ; Repková, Martina (referee) ; Potáček, Milan (advisor)
The aim of this project was a literature search on application of organic semiconductors in optoelectronics and on synthesis of higher molecular conjugated precursors containing C=N bonds. Project is divided into theoretical section, experimental section and discussion. Theoretical part is focused on conductivity in organic compounds, principle of absorption and emission of energy radiation and its application in organic light-emitting diodes. There are also described reactions, which can be used for syntheses of target substances. Subject of the experimental section is synthesis of planned structures and their structure characterization. In the discussion part detailed description of the used methods is presented, problems with their application and final results.
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Materials for organic electronics
Skrášek, Martin ; Zmeškal, Oldřich (referee) ; Vala, Martin (advisor)
The work contains literature search on organic electronics, especially organic solar cells. There is described in detail their principle of function and used materials. Also there are mentioned possibilities of synthesis of conjugated systems for this applications and methods of their structural, optical and electrical characterization. In experimental section and discussion is introduced synthesis of five new, various substituted derivates of benzylidenaniline and their characterisation together with another seven derivates, whose synthesis has been described in bachelor thesis. There is investigated influence of substituents to chemical shift of hydrogen on imine bridge and to position of absorption peaks in UV-Vis spectra. There also has been found method for fabrication of thin layers and solar cells with bulk heterojunction have been fabricated. Next, V-A characteristics and impedance spectra of the cells were recorded. According to obtained results, investigated systems act as photodiodes and in case of three derivates the photoinduced increase of electric current has been observed. But for application in solar cells it is necessary to shift the position of absorption spectra towards longer wavelengths.
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Synthesis and properties evaluation attempts in new highermolecular conjugated systems applied for optoelectronics.
Skrášek, Martin ; Repková, Martina (referee) ; Potáček, Milan (advisor)
The aim of this project was a literature search on application of organic semiconductors in optoelectronics and on synthesis of higher molecular conjugated precursors containing C=N bonds. Project is divided into theoretical section, experimental section and discussion. Theoretical part is focused on conductivity in organic compounds, principle of absorption and emission of energy radiation and its application in organic light-emitting diodes. There are also described reactions, which can be used for syntheses of target substances. Subject of the experimental section is synthesis of planned structures and their structure characterization. In the discussion part detailed description of the used methods is presented, problems with their application and final results.
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