1.1 Structural, Optical, and Related Properties of Some Perovskites Based on Lead and Tin Halides: The Effects on Going from Bulk to Small Particles

George C. Papavassiliou1, George A. Mousdis1 and Ioannis Koutselas2

1 Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48, Vasileos Constantinou Avenue, 11635 Athens, Greece

2 University of Patras, Department of Materials Science, Patras, 26504, Greece

1.1.1 Introduction

The preparation or/and investigation of perovskites, based on PbX y and SnX y (X = Cl, Br, I) units, was the subject of publications in a number of papers (see, for instance, [163]). The majority of these compounds consist either of a small cation (SC) group, such as K+, Cs

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