Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.262
Publication date: 18th December 2023
Ultrafast transient spectroscopy is a vital tool to investigate the photophysical processes taking place in energy harvesting materials. In particular, the findings provide valuable insights into the efficiency limiting processes in solar cells. The focus of this talk will be on solution-processed metal-halide perovskite solar cells as they have received immense attention in the field of photovoltaic research due to their outstanding power conversion efficiency, which has surpassed 26% in a relatively short time. Understanding carrier losses at metal halide perovskite/charge transport layer interfaces is a pre-requisite to bring the efficiency closer to the Shockley-Queisser limit. Interfacial recombination can to some extent be accessed through time resolved techniques, however identifying this is often a challenge due to the complexity associated to the interpretation and modelling of the extracted charge carrier transients.
approach is to utilize complementary transient spectroscopic techniques, namely transient absorption spectroscopy and transient photoluminescence spectroscopy, not only to unravel the processes limiting the solar cell’s short circuit density and the open circuit voltage but also to evaluate different charge recombination channels and extraction. Herein, we limit our focus to examine half-stacks comprised of the photoactive layer and the respective hole transport layers. Several different hole transport materials (PTAA, NiOx,,and 4PACz) are adjacent to the photoactive layer with a bandgap of 1.53 eV. We report on challenges faced during performing complementary spectroscopic techniques and interpretation of the extracted transients. Specifically, differentiation between photophysical processes such as charge extraction and interfacial charge recombination.
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