Karl Franzens University Graz
Graz University of Technology
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Karl Franzens University Graz | Graz University of Technology | |
Probing halide perovskites by photoelectron spectroscopy – what have we learned by now? Video: https://tugraz.webex.com/tugraz/j.php?MTID=maa3fcadbeb1db2e591820fbdf59da0f0 Research on novel semiconducting materials for application in optoelectronic devices has gained increasing interest in the past years. This is especially true for halide perovskites, which show extraordinary efficiencies when used as absorber material in solar cells. However, rather little is known about the electronic structure of the different compounds that make up this material class and how they behave when incorporated in more complex device stacks. In this talk, I will introduce photoelectron spectroscopy as a powerful tool to gain deeper insight. Here, UV and inverse photoelectron spectroscopy help to reveal how energy levels can be tuned by changing the material composition. Results from x-ray photoelectron spectroscopy further show how complex chemical processes can take place at the interfaces that have to be considered when designing and optimizing optoelectronic devices. |