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| Identifier |
000412501 |
| Title |
Study and fabrication optimization of photodetectors based on Transition metal dichalcogenides |
| Alternative Title |
Μελέτη και βελτιστοποίηση της κατασκευής φωτοανιχνευτών με δισδιάστατα διχαλκογενίδια μεταβατικών μετάλλων |
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Author
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Χατζαράκης, Νικόλαος Γ.
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Thesis advisor
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Ηλιόπουλος, Ελευθέριος
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Reviewer
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Δεληγεώργης, Γεώργιος
Πελεκάνος, Νικόλαος
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| Abstract |
Photodetectors are devices that convert light into electricity and are widely investigated by scientific community for numerous years.
Transition metal dichalcogenides (TMD's) belong to the family of 2D materials. Because of their atomically thin structure and direct band gap that is in the spectrum of visible light, they are considered a promising material for photodetection in the sence that extreme downscaling can result in ultra small devices.
The scope of this thesis is to fabricate, study and optimize photodetecting devices based on 2D MoS2, a member of the TMD’s group. It should be mentioned that at the beginning of this work, no material nor any processing know-how existed in the group. So the task is to overcome several hurdles towards the end goal. To begin with, Chemical vapor deposition technique was used to obtain large area of high quality ultrathin MoS2 suitable for large-scale applications. Raman and photoluminescence analysis were used to optically characterize this material. Electrical measurements were performed under dark conditions for testing the performance of metal contacts which is a key element of devices and to test devices at different stages of treatment such as after annealing and passivation with dielectric film. Finally, only preliminary photosensitivity data were gathered using a low power white light source. There was no time to downscale the photodetectors to nanometric size but even in the cases studied photo-sensitivity is significant.
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| Language |
English |
| Subject |
2D materials |
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Δισδιάστατο υλικό |
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Φωτοανιχνευτής |
| Issue date |
2017-11-22 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
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Type of Work--Post-graduate theses
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| Views |
448 |
Study and fabrication optimization of photodetectors based on Transition metal dichalcogenides
