Perovskite solar cell issues catch cost carriers and after that launch them once again

• Amongst the most exciting products for solar cells are the supposed MAPI semiconductors. They consist of natural methylammonium cations and lead iodide octahedra that develop a perovskite structure. MAPI based solar cells have achieved performances of 25% within a couple of years. However so far, the semi-organic semiconductors are still maturing swiftly.

Currently, for the first time, an HZB group led by Dr. Artem Musiienko has precisely defined 5 various defect types and determined the interaction in between these problems and the charge carriers.

Making use of a mix of highly delicate spectroscopy methods, they was successful in experimentally figuring out the focus, energy, capture cross-section and also charge capture time of the different issues as well as producing a map of the flaws. By using electrical pulses, they ensured that the dimensions did not impact the quality of the material.

The measurement results allow the reputable distinction between electron and hole transport and also the decision of their crucial specifications: Movements, life times and also diffusion lengths. "This job therefore supplies solution to questions that have been gone over for a very long time in the field of perovskite solar cells," states Musiienko.

A vital searching for: a big percentage of the issues launch the captured charge service providers again after a short time. "This might partially explain these particularly high performances of the MAPI perovskites," says Musiienko. These outcomes pave the way to maximize MAPI perovskites in terms of defect concentration, combining high effectiveness with great stability

The study was published in Advanced Functional Materials.