Date: June 28, 2023Time: 11:15 am – 12:00 pmLocation: https://fau.zoom.us/j/69833499044
Dr. Musiienko, currently a MariaSkłodowska Curie Postdoctoral Fellow at Helmholtz-Zentrum Berlin, is dedicatedto investigating pathways for developing efficient and stable eco-friendly tinperovskite solar cells. As a part of his presentation, he will introduceinnovative methods for interface and material characterization. Dr. Musiienkoworks in Prof. Antonio Abate's group and collaborates with the solar celldivision at HZB, contributing to advancements in the field of solar cellresearch.
The development of novelsemiconductor and semi-insulating materials, as well as the improvement ofexisting ones, relies on a comprehensive understanding of their free-chargetransport properties. Knowledge of minority and majority charge carrierdiffusion lengths, charge extraction, lifetimes, mobilities, and concentrationsis crucial for tailoring the design of semiconductor devices and effectivelycontrolling solar cells, transistors, detectors, sensors, and LEDs. However,the detection of minority and majority charge carrier properties poseschallenges due to limitations in experimental methods.
Commonly used techniques such astime-resolved photoluminescence (trPL), terahertz conductivity, andphotoconductivity decay are limited to detecting the lifetime of eitherminority or majority carriers, which primarily control the fast decay componentof the signal. Additionally, the dynamics of recombination decay and carrierextraction often overlap, further hindering the characterization of barrier andheterojunction interfaces.
In this talk, Dr. Artem Musiienko(AM) will present two methods for material and interface characterization. Thefirst method, called constant light induced magneto-transport (CLIMAT),combines light and magnetic fields to assess the transport properties of holesand electrons separately. CLIMAT provides access to fourteen materialparameters compared to only two parameters obtained through classicalapproaches. AM will demonstrate that direct knowledge of electron and holeproperties enables the unlocking of quasi-Fermi level splitting and idealityfactor, predicting material performance in photovoltaic (PV) deviceconfigurations without fabricating the full device.
The second topic presented by Dr.Musiienko will focus on time-resolved surface photovoltage (tr-SPV) forinterface characterization. tr-SPV is a sensitive, contactless, and non-destructivetechnique [10.1016/j.joule.2021.07.016] that detects charge extraction andlosses at both top and buried interfaces. Using tr-SPV, AM and colleagues probethe illumination-induced surface potential to determine the direction andextraction rate of free electrons and holes. To fully understand tr-SPVdynamics, AM applies charge transport simulations involving excitation andrecombination of charges in thin films and at the interfaces of thin-filmphotovoltaic solar cells (THPSCs).
Dr. Musiienko will demonstrate theimplementation of these methods on various material systems, including silicon,tin halide perovskite, and lead halide perovskite systems.
To join the meeting you can use: https://fau.zoom.us/j/65660684118
For the password please contact Anastasia Barabash