Relationship Between Structural and Optoelectronic Properties in Mixed Sn-Pb Halide Perovskites
Controlling Doping, Crystal Defects, and Phonon-Induced Disorder for Efficient Solar Cells
J. Nespoli (TU Delft - ChemE/Opto-electronic Materials, TU Delft - QN/Kavli Nanolab Delft)
T.J. Savenije – Promotor (TU Delft - ChemE/Opto-electronic Materials)
A.J. Houtepen – Promotor (TU Delft - ChemE/Opto-electronic Materials)
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Abstract
This dissertation describes the properties of spin-coated tin-lead (Sn-Pb) halide perovskites, Cs0.25FA0.75SnxPb1-xI3 with varying Sn fraction, x. This class of low-bandgap semiconductors holds a strong potential as absorber material for next-generation perovskite solar cells. Through a combination of microwave-based conductivity techniques, optical spectroscopy, structural, microstructural and compositional analyses, this work provides a comprehensive view of how oxidation processes, chemical additives, and phonons determine doping, defect density, and energetic disorder in these perovskites. The five chapters together build a coherent framework that links the nano- and microscale perovskite structural to opto-electronic properties, revealing pathways to overcome key bottlenecks in the development of efficient and stable Sn-Pb perovskite photovoltaics.