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Alternative Substrates for Sustainable and Earth-Abundant Thin Film Photovoltaics

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Alternative Substrates for Sustainable and Earth-Abundant Thin Film Photovoltaics Alternative Substrates for Sustainable and Earth-abundant Thin Film Photovoltaics Ignacio Becerril Romero Aquesta tesi doctoral està subjecta a la llicència Reconeixement 4.0. Espanya de Creative Commons. Esta tesis doctoral está sujeta a la licencia Reconocimiento 4.0. España de Creative Commons. This doctoral thesis is licensed under the Creative Commons Attribution 4.0. Spain License. Alternative Substrates for Sustainable and Earth-abundant Thin Film Photovoltaics Memòria presentada per optar al grau de doctor per la Universitat de Barcelona Programa de doctorat en Enginyeria i Ciències Aplicades Autor: Ignacio Becerril Romero Directors: Dr. Edgardo Saucedo Silva i Dr. Paul Pistor Tutor: Prof. Dr. Alejandro Pérez-Rodríguez Every human civilization has inevitably collapsed. Ours is not going to be different. However, this time we have the knowledge and capacity to decide how we want it to happen. Let’s make it softly, peacefully and living long and happy lives in harmony with nature. Acknowledgments I could not have done this thesis without the help, support, guidance and wisdom of many, many people. I will try to show my gratitude to all of them but, if I forget anybody, do not take it personally. My brain is really exhausted after the hard work of the last months. I would like to start by thanking Edgardo for giving me the opportunity of doing my PhD studies in IREC under his supervision. Likewise, I would like to thank Paul, my second supervisor, for his knowledge and valuable inputs. I have learned a lot from you both and I hope I can keep learning from you in the future. Of course, I would also like to thank Alejandro, my thesis tutor, for his guidance and for always finding some time to help everybody despite the stress and the huge amount of work to which he is usually exposed. Now, I will try to thank all the people with whom I have worked and/or that have contributed to this thesis either professionally, personally or both. For the sake of equality, I will stick to the following order: 1. IREC workers a. Time-based: the different stage of the thesis in which I met you or work with you. b. Alphabetically 2. Other places 3. Family and friends IREC workers Old times Alex → Thank you for your unconditional friendship and support that, I am sure, will last for very long after you leave IREC and find your own way. Diouldé → I could write at least 30 pages to express my sincere gratitude for everything you have done for me in the last years. Unfortunately, this thesis is already too long. You are an extraordinary person. Thank you for EVERYTHING. Florian → Thank you for sharing with me so many nice moments inside and outside IREC and for being my sparring in the Kung Fu classes. Haibing → You are an extremely gifted researcher and a super nice person. In addition, you are my ping pong and Kung Fu master. I appreciate all the time we have spent together. Thank you very much. Laura → Thank you for being by my side (literally), for giving me so much support in my first two years in IREC and for not forgetting about me when you left. Marcel → I have learned so much from you…: sputtering, guarradas, coffee, bikes… Thank you for that, for being such a nice and wise guy and for your invaluable support. Markus → Thank you for teaching me so much, for your wisdom and for always being in a positive mood. Max → Thank you for you calmed friendship, your nice company and your professionality. Moisés → I am very thankful for letting me continue your research on transparent substrates and use it for this thesis. Thank you also for everything else. Mónica → Thank you for your friendship and for all the support you gave me at the first stages of my thesis. Rokas → Thank you for eating pizza with me on Fridays in the old times, for your support (especially with the 5th chapter of this thesis) and for your friendship. Sergio → Thank you for all these years working together, for all the times you have helped me and for all the nice moments we have shared. Simón → I am very thankful to you. You were the person taking care of me in my first days in IREC with your special style (I still remember my first day when you bombarded me with all your research mixed with “mona” and “clin clin”) but with great research abilities. I owe you a lot about my research and way I do it which is clearly inspired in yours. In addition, you supported me from day one. Thank you very much. Víctor → Thank you for your wisdom, your enthusiasm, your support, the Monday beers and for caring about me. Yudania → Thank you for being always on my side supporting me, for teaching me all I know about chemical processing and for being the good person you are. I would also like to thank other people from the old times in IREC with whom I shared part of my thesis: Cristina, Doris, Matías, Mirjana and Xavi. More recent times Jacob → Thank you for being my friend, for your scientific discussions, your company until 10 pm in the lab, for your support, for sharing so many things with me both inside and outside IREC, for always supporting me and for making me a part of your life. Mohamed → Thank you for being always in a pleasant mood and for always thinking good of me. Pedro → Thank you for your nice and relaxed character, for your support and for inviting me to join you so many times to smoke (even though I am not a smoker) and to other healthier activities. Very recent times Alex gallego → Thank you for your support and for being such a nice guy and a good colleague in the short time you have been in IREC. Robert → Thank you for your hard work, your professionality and your calmed character. Zak → Thank you for being there every single time I have asked you for help and for your knowledge and support. I would also like to thank the newest guys, Kunal and Oriol, for being so nice to me during the little time they have been in IREC. LATAM Thanks to all the LATAM people in IREC for sharing with me their culture and friendliness. Esteban → Thank you for your friendship and for being always so kind and positive. Jacob → See previous section. But also thank you for making me part of the LATAM community. Parce → Thank you for being such a good friend and for sharing so much with me during the time you were here. Roberto → Thank you for all the help you gave us, your professionality and for being such a nice person. Thanks also to César and el Perú for the moments we have shared. MASCIR I would like to thank all the people in MAScIR for becoming my family during my secondment there: Prof Sekkat, Safae, Siham, Sara, Sanaa, Nadjet, Nada, Yahya, Tarik, Hatim and Abderrahim and, of course, to Zakaria. A very special thanks goes to my dear Imad. Thank you for being such a good friend and colleague and for taking care of me in Morocco. Others Thanks to Diego and Iván, from UJI, for the ceramic substrates as well as for their help and friendliness during the ECOART project. In addition, I would like to thank Alfonso for making me pass from looking comfortably into the abyss of growth, energy and sustainability to making me fall into it. Finally, there is a person that should also be thanked because, without her, this and many scientific works would not be possible: Alexandra Elbakyan. Thanks for making science freely available for everybody, as it should be. Family and friends This work would have not been possible at all without the support given to me by my family and friends. Thanks to my friends from Zaragoza: Alb, Basti, Blesa, Eric, Nacho y Quílez; for always being there when I needed them regardless our ups and downs. I would of course like to thank my parents: my father José Luis and my mother Elda. All that I am and all that I have achieved is thanks to you. I will always be grateful to you. Likewise, I would also like to thank my sister Sofía, my grandmothers, Aurora y Ángeles, my grandfathers (wherever they are), Pepe y Pascual, and the rest of my family for everything they have done for me and given to me. And, last but not least, thanks to my beloved wife Anita. Thank you for being always by my side, for suffering my grumpy mood all the times that I have been stressed (i.e. 90% of the days), for dealing with my frequent migraines, for helping me in every way you can, for caring so much about me and for your unconditional and true love. Table of contents Preface and publications _________________________________________________ i Prefacio y publicaciones ________________________________________________ iii List of acronyms and abbreviations _______________________________________ vii Table of figures ________________________________________________________ x List of tables _________________________________________________________ xvi 1. Introduction ______________________________________________________ 1 1.1 Energy supply in a growth-addicted financial system: what is the role of photovoltaics in all this? _____________________________________________________ 1 1.1.1 The threat of fossil-fuel dependence: the hidden link between economy, growth, complexity and energy _____________________________________________________________ 1 1.1.2 Lights and shadows of photovoltaics: potential, EROI and limitations _________________ 4 1.1.3 Focus and motivation of this work _____________________________________________ 8 1.2 Fundamentals of solar cells _____________________________________________ 8 1.2.1 What is a solar cell and how does it work? ______________________________________ 8 1.2.2 Main parameters of solar cells _______________________________________________ 13 1.3 Photovoltaics:
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