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Title UV laser-induced reduction of graphene oxide layers for photovoltaic applications
Author Μιχαήλ, Ανδρέας
Thesis advisor Στρατάκης, Εμμανουήλ
Abstract In recent years, a great interest have been developed in the research of graphene and graphene oxide applications. In this thesis, we discuss about the laser-induced reduction of graphene oxide. The main goal is to find the proper parameters for the graphene oxide deposition on substrates as well as the uniform laser reduction of graphene oxide layers for large areas, Firstly, we discuss about the basic principles of lasers and how they work. We briefly discuss about UV excimer lasers, in particular KrF excimer laser tecgnology. which is used in our expirements. Then, we continue discussing about graphene and graphene oxide synthesis and structure. Then, the laser-induced reduction of graphene oxide is explained. At last, we shortly refer to the basic theory behind UV-Vis spectroscopy and I-V measurements, which are used in the experimental procedure in order to characterize the laser-treated samples. In the experimental procedure, we present materials and methods used. At first, there is a report in the production of the graphene oxide solution. Continuing, we make a statement at the GO deposition on the substrates prepared using the SimCoater spray coater. Then, we explain the experimental procedure for the laser reduction by illustrating, using different parameters for the reduction need. Lastly, different techniques have been used for the characterization of the laser- treated surface. Optical and electrical properties of the materials were studied by mean of UV- VIS spectroscopy and Two probe method, respectively. The results are illustrated in the last section, where we discuss on the experimental results. During this thesis, as shown in this section, the spray-coated GO film uniformity is greatly improved. Then, we define the appropriate laser parameters for the successful laser-induced reduction of the GO film in a single spot area. Further, the best laser and scanning parameters are determined to achieve GO reduction over large areas. Absorbance and sheet resistance measurements provide a valuable feedback information for the success of the GO reduction process.
Language English
Issue date 2022-07-22
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/f/5/d/metadata-dlib-1657785258-983557-25791.tkl Bookmark and Share
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