Author, Institution: Ranush Durgaryan, Kaunas University of Technology
Science area, field of science: Technological Sciences, Materials Engineering, T008
Scientific Supervisor: Prof. Hab. Dr. Juozas Vidas Gražulevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Scientific Advisor: Dr. Jūratė Simokaitienė (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Dissertation Defence Board of Materials Engineering Science Field:|
Prof. Dr. Jolita Ostrauskaitė (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008) – chairperson
Prof. Dr. Saulius Grigalevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Dr. Heghine Ghazoyan (Yerevan State University, Armenia, Natural Sciences, Chemistry, N003)
Dr. Šarūnas Meškinis (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Prof. Dr. Victoria Plavan (Kyiv National University of Technology and Design, Ukraine, Technological Sciences, Materials Engineering, T 008)
Dissertation defence meeting will be at the Meeting room at Santaka Valley of Kaunas University of Technology (K. Baršausko 59 – A228, Kaunas)
The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas)
Annotation: During the early development of perovskite solar cells (PSCs), the selection of organic hole-transporting materials (HTMs) was very limited. The main reason for this problem was a lack of understanding about the structures required to achieve high efficiency of the devices. The most popular low-molar-mass HTM used in PSCs is 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene. The synthesis of this compound consists of six steps. In addition, aggressive and sensitive reagents are used. The thesis is devoted to the synthesis and investigation of new, cost-effective, organic HTMs for PSCs. Taking into account that development of HTMs for additive-free PSCs is an urgent issue, the author of the thesis designed, synthesized, and studied several series of new low-molecular-mass organic HTMs. A number of publications that describe a simple pathways for the synthesis of efficient HTMs with branched structures forming stable molecular glasses were prepared. N,N-di(4-methoxyphenyl)hydrazones and the corresponding dihydrazones of carbazole and phenothiazine carbaldehydes were designed and synthesized using cost-effective synthetic strategies. Their properties were studied. Dibenzothiophene based derivatives for the stable additive-free PSCs were also prepared. Due to their high conductivity in the pristine state, HTMs can be used without dopants and allow to achieve encouraging power conversion efficiency of PSCs of 20.9%. Triphenylamine based enamines also enable to obtain PSCs exhibiting long-term stability, which is important for commercial application. The dioant free hole-transporting layers of indolo[3,2-b]carbazole derivatives also can be used for the fabrication of efficient PSCs. The devices with pristine layers of these HTMs have shown a very promising power conversion efficiency of 19.45%.
April 18 d. 10:00
Meeting room at Santaka Valley of Kaunas University of Technology (K. Baršausko 59 – A228, Kaunas)
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