Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.056
Publication date: 18th July 2019
Semiconductor-based water splitting and photovoltaic systems are often complex, multilayer systems where each layer and interface is engineered to maximize the efficiency and stability of the device. Due to the multiplicity of interfaces in such devices, identification of the limitations in order to improve the performance is challenging. In this talk, I will discuss operando techniques such as dual working electrode (DWE), photoelectrochemical impedance spectroscopy (PEIS), and transient photocurrent as they are applied to multilayer photocathodes and photoanodes. In water splitting photoelectrodes, the DWE technique can be used to deconvolute the photovoltaic output of the photoabsorber from the electrocatalytic performance of the surface catalyst,[1] and is useful in determining the band alignment in heterojunction systems under operation. I will discuss how impedance spectroscopy can be used to identify the limitations in complex systems such as Au/Cu2O/Ga2O3/TiO2/RuOx photocathode, through analysis of the potential dependent resistances that are detected by PEIS.[2] I will show how a combination of these techniques can be used to gain a clearer picture of the underlying photophysical charge carrier processes that are taking place in these photoelectrodes under practical operational conditions.
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