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Understanding the origin and implications of grain size in hybrid perovskite films and solar cells. (R-7253)
During the last few years, perovskite solar cells have gained massive interest as potential competitor for Si and CIGS solar cells, owing to their favorable opto-electronic properties and ease of fabrication, using thin film technology. Despite the swift succession of achievements in terms of power conversion efficiency, the physical and chemical mechanisms that govern the formation of the (crystalline) perovskite and the operation of corresponding solar cells are still very much in the process of being unraveled. As evidenced by current literature and our own experience, one elusive aspect is the relation between the grain size in a perovskite thin film and its opto-electronic properties. The proposed research therefore aims to fabricate perovskite films with well-defined crystal sizes by exploring suitable combinations of fabrication methods and starting products. The films are then characterized with respect to relevant properties such as crystallinity, charge carrier lifetime and defect concentration. Ultimately, the films are implemented as absorber layer in wellestablished photovoltaic cell architectures to investigate the impact of crystal morphology and opto-electronic properties on the device performance. Finally, also the stability of such cells is studied as a function of the perovskite crystal size. The outcome of the project will generate design rules for further development of stable perovskite solar cells with efficiencies approaching the theoretical limit.
Date:1 Oct 2016 → 30 Sep 2019
Keywords:hybrid perovskite films, solar cells
Disciplines:Condensed matter physics and nanophysics, Medicinal and biomolecular chemistry, Molecular and cell biology, Plant biology, Systems biology, Ceramic and glass materials, Materials science and engineering, Semiconductor materials, Biophysics