On Exciton–Vibration and Exciton–Photon Interactions in Organic Semiconductors

Abstract

This thesis is the result of my own work and includes nothing which is the outcome of work done in collaboration except as declared in the Preface and specified in the text. It is not substantially the same as any that I have submitted, or, is being concurrently submitted for a degree or diploma or other qualification at the University of Cambridge or any other University or similar institution except as declared in the Preface and specified in the text.I further state that no substantial part of my thesis has already been submitted, or, is being concurrently submitted for any such degree, diploma or other qualification at the University of Cambridge or any other University or similar institution except as declared in the Preface and specified in the text. It does not exceed the prescribed word limit for the Physics and Chemistry Degree Committee. Antonios M. AlvertisI thank my good friends Vasilis and Stratis for all the incredibly fun times in Cambridge and Athens, for hosting me in their house countless times, for sharing their food which was always tasty, for the music evenings, for having drinks at Darbar and so much more that I could never put on paper. I thank Iasonas and Georgia, that together with Stratis formed my St Edmund's crew of my last year, making me to always hang around college and looking forward to our dinners together and to our chats in the CR.Almost from my first day in Cambridge, and up to the last as a Ph.D. student, I stayed in Link House. It was amazing how many good friends from all over the world I made in this international community. I am thankful to the wardens, Gary and Anne, for making sure that the atmosphere was always so great, and for always being there when I needed support in any way possible. There is a lot I could say about my friends from the house, but a big thanks to Daniele and Jee-Yeon, Diego, Elena, Toshi and Chiara will have to suffice for now.Even lockdown was a nice time in Link House, for which special thanks go to Beatrice for all the fun things we did and for teaching me so much about movies.I would never have managed to achieve the things I did had it not been for my family and friends in Greece. I cannot imagine that one could wish for better and more supportive parents than my mother Cornelia and my father Yannis. Without them, and without my grandparents Antonis and Vasiliki, I would not be the person I am today. I owe eternal gratitude to our family friend Dr. Panagiotis Komninos, who so tragically passed away.It was largely thanks to our countless discussions on physics and what it's like to be an academic abroad that I was able to obtain a better understanding of the possible paths I could follow. It was also always such good fun to hear his stories about the Greek community in Munich. Finally, I owe the deepest thanks to my aunts Zeta and Mary for always being there in the difficult times, and my aunt Monica and cousin Marina for their unconditional love. Contents 1 Introduction I Background 2 Organic semiconductors and their properties 2.1 The chemis...