Periodic Reporting for period 1 - PhotSol (Towards the Photonic Solar Cell-In-Situ Defect Characterization in Metal-Halide Perovskites)
Reporting period: 2019-07-01 to 2021-06-30
This project focusses on the physics of these solar cells, and in particular on electronic defects that are a source of performance losses. Origins of these defects could be surfaces, crystal defects, grain boundaries, or impurities. The objectives of this projects are to better characterize the role of these defects on the photovoltage of the solar cell. This goal is achieved by combining numerical modelling and experimental data, for instance to better comprehend the transient photovoltage signal. To better understand the role of (unintentional and unwanted) impurities, an approach has been selected to systematically introduce a certain impurity with a controlled concentration.
During this project, it has been found that certain impurities are highly relevant. Furthermore, common characterization methods have been critically evaluated.
A second part of this project is dedicated to a further major drawback of the common high-efficiency perovskite solar cells: They contain the toxic element lead. This project started looking into the defect physics of alternative materials (double perovskites).