Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.371
Publication date: 16th December 2024
Understanding and minimizing non-radiative recombination pathways is key to enhanced efficiencies in emerging solar cells, such as perovskite solar cells (PSC) and organic photovoltaics (OPV). Non-radiative recombination in any form, i.e. trap-assisted, or surface recombination of minority carriers at the (wrong) electrode will inevitably lead to lower efficiencies [1]. However, given the fast development of the efficiencies, the stability of OPVs is still not satisfactory.
In this talk, I will focus on the charge transport layers (CTL) and their properties in increasing efficiency and stability. I will focus on the passivation of metal-oxides in nip-solar cells for OPVs. The criterion that the CTL is conducting [2] will simultaneously lead to loss of selectivity [3]. We have identified and mitigated an important loss-factor caused by ZnO in OPVs. Surface defects in ZnO cause n-doping in a thin layer close to the cathode, causing a loss of Jsc. By inserting a thin layer of SiOxNy from solution processing, the recombination zone will be removed, with increased efficiency and lifetime as a result [4].
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