Our invited speaker at the upcoming workshop in Berlin, David Lindgren, PhD, has a lot to share about his expertise in characterizing the optical properties of semiconductors. Delmic talked with him to give you a sneak peek of his presentation on the 21st of November.
David has worked as a senior engineer at Sol Voltaics, a start-up which produced solar cells out of nanowires with a new technique called Aerotaxy. His PhD was dedicated to optical characterization of III-V semiconductors for different components like LEDs and solar cells. It allowed him to expertly manage cathodoluminescence and photoluminescence systems and perform fundamental research looking at impurities of materials and defects that could be related to malfunction of components.
In his presentation David will focus on how cathodoluminescence technique was used at Sol Voltaics: “I will demonstrate results from the materials we used, show different phenomena we found and share ways we used to quickly extract key performance indicators, such as estimated doping concentration. The materials of interest were Gallium Arsenide nanowires grown by Aerotaxy and MOCVD, with and without a passivating Aluminum Gallium Arsenide shell. We did several hundred CL measurements per week and really managed to develop methods for quick analysis of the data”.
David acknowledges that the spatial resolution achieved with cathodoluminescence was particularly beneficial, especially because the hyperspectral mode of the SPARC system was used, but occasionally complementary measurements by additional techniques were needed, such as TEM, XRD and low temperature PL.
The workshop will take place in Berlin on the 21st of November, and you still can register. Feel free to check the full program here. Are you interested in meeting fellow researchers like David and others who work in this field? Then make sure to register soon (the attendance is free).