Recently, a new class of highly efficient thin film solar cells based on metal-organic hybrid perovskites has attracted much attention, with demonstrated power conversion efficiencies above 17%. These solar cells promise to be fabricated at low cost, as the perovskite absorber layer consists of abundant materials and can be easily synthesized by wet chemistry. Thin films prepared with APbX3 perovskite nanoparticles could be a good candidate for this purpose. The deliberate tuning of the optical and electrical properties of the perovskite absorber layer via the control of size and assembly of such nanoparticles is highly promising for the realization of highly efficient tandem cells. However, only limited work has been published regarding the fabrication of such nanoparticles, especially with sizes as small as several nanometers.
The aim of the PhD thesis is to develop highly controllable and reproducible synthesis techniques to fabricate novel perovskite layers via solution chemistry approaches at low temperatures, by careful consideration of the interactions between organic and inorganic elements. One important task will be to tune the optical properties by the size, organic ligand and composition of the perovskite nanoparticles. In particular, the influence of the perovskite layer structure and composition on the optical and electronic properties will be studied, ideally yielding homogeneous and stable absorber layers for high efficiency hybrid perovskite solar cells.