This MSc project aims to demonstrate that an increase in efficiency of perovskite solar cells (PSCs) is possible via up-conversion (UC) of near infrared (NIR) photons that have less energy than the bandgap of the absorbing semiconductor. These photons are commonly lost and described as transparency losses, which is one of the major loss mechanisms and efficiency limiting factors for PV devices. PSCs are currently attracting a lot of R&D attention worldwide due to the rapid increase in reported efficiencies in only a few years since their original invention. However, the transparency losses remain and therefore UC of this part of the spectrum can have a major impact in further increasing their efficiency and market potential.
Inorganic crystalline materials doped with ions of rare-earth (RE) elements can perform efficient UC of NIR light. The scope of the project is the fabrication and optimization of a UC layer by embedding UC microcrystalline material (available in our group) into a polymer film. The film will be optically characterized (absorption, transmission, emission), then combined with a PSC and finally, the PSC will be electrically characterized PV using laser excitation.
Further information on the Institute of Microstructure Technology (IMT): www.imt.kit.edu