Unit:
Κατεύθυνση Τεχνολογίας Ολοκληρωμένων ΚυκλωμάτωνΠληροφορική
Author:
Patsialos Ioannis
Supervisors info:
Βασιλοπούλου Μαρία ,Ερευνήτρια Β΄ ΕΚΕΦΕ ΔΗΜΟΚΡΙΤΟΣ
Σουλτάτη Αναστασία,Μεταδιδακτορική Ερευνήτρια ΕΚΕΦΕ ΔΗΜΟΚΡΙΤΟΣ
Original Title:
Βελτιστοποίηση οργανικών φωτοβολταϊκών διατάξεων υψηλής απόδοσης με χρήση οξειδίων μετάλλων μετάπτωσης ως υμένια έγχυσης/εξαγωγής οπών
Translated title:
Optimization of high efficiency photovoltaic devices using metal oxides as transport and extraction layers
Summary:
This diploma thesis deals with the optimization of high efficiency photovoltaic devices using molybdenum oxide as hole extraction layer.These devices are based on Bulk Heterojunction (BHJ) photovoltaic cells. Molybdenum oxide films are deposited between the anode electrode and the active layer of the device, P3HT:PC71BM, replacing the widely used PEDOT:PSS hole injection film.
The diploma thesis includes two parts, the theoretical and the experimental. The theoretical part includes 4 chapters and an introduction to organic semiconductors is initially introduced and their properties and deposition techniques are presented. The following is the description of the operating principle and the types of organic photovoltaic cells. In the third chapter we study the modification of interfaces between the electrodes and the organic film of the photovoltaic device efficient transport and extraction of charge carriers. The final chapter of the theoretical part presents the deposition techniques and applications of metal oxide thin films are described.
The second part is also the experimental part of the reported work. Initially, the manufacturing processes and methods for characterization of organic photovoltaics are described, and the results obtained from the use of microwave annealed molybdenum oxide films as a hole extraction layer in organic photovoltaic devices are then studied and analyzed.
In conclusion, microwave annealing induces an individual rearrangement and crystallization of molybdenum oxide films. The use of microwave heated molybdenum oxide as a hole extrachim film in organic photovoltaic devices has led to an increase in their performance. Finally, microwave annealing of oxides improved the crystallinity and morphology of the photoactive film coated on them, enhancing the transfer and extraction of the holes, resulting in an increase in the electrical characteristics of the photovoltaic devices.
Main subject category:
Science
Keywords:
Transition metal thin films, molybdenum oxide, bulk heterojunction, organic photovoltaic cells, hole transport/extraction layer
