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Start of funding 01.07.2023
Understanding and controlling photovoltage generation in interface-engineered photocathodes for CO2-reduction
Prof. Dr. Ian Sharp
Technische Universität München
Walter Schottky Institut
Dr. Adam Schwartzberg
University of California, Berkeley
Laurence Berkeley National Laborator, Molecular Foundry
This collaborative research project brings together the expertise of the Molecular Foundry at Lawrence Berkeley National Labs and the Walter-Schottky-Institute (WSI) at the Technical University of Munich. The WSI has engineered advanced charge-selective protective layers on III-V light absorbers, with engineered optoelectronic properties achieved through atomic layer deposition (ALD). Dr. Adam Schwartzberg's proficiency in ALD and transient optical spectroscopies will play a crucial role in understanding the complex dynamics and engineering the interfaces between semiconductors and protective layers. The project focuses on investigating and understanding competitive kinetics at working interfaces and factors influencing photocarrier recombination and photovoltage generation by utilizing in situ pump-probe transient absorption spectroscopy performed at the Molecular Foundry. By utilizing the Nanofabrication Facility, precise investigation of interfaces and coatings are possible. The anticipated outcomes include gaining insights into loss processes, identifying non-idealities in photoelectrodes, and improving charge transport. The collaborative project aims to examine the properties of protection layers on InP and GaInP absorbers, analyzing defects and photovoltage losses. By combining state-of-the-art synthesis and characterization techniques, this collaboration seeks to advance the efficiency and stability of energy materials.