Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.150
Publication date: 30th March 2023
Metal halide perovskites have shown remarkable optoelectronic properties and have been employed in a range of emerging applications including photovoltaics (PV), spintronics and X-ray detectors. Optimising and understanding charge and spin transport properties in perovskite materials has been one of the key research areas to push their performance. In this talk, I will discuss a few examples on how we have used ultrafast spectroscopy techniques including Terahertz time-domain spectroscopy (THz TDS) and transient absorption spectroscopy (TAS) to study the spin and charge transport properties of hybrid perovskite materials.
Firstly, I will discuss the spintronic properties of two-dimensional (2D) perovskites. Theoretical calculations have shown large spin-orbit interaction and layered Rashba states in 2D perovskites, suggesting 2D perovskites are promising candidates for spintronic THz emitters. Herein, our polarization resolved THz emission spectroscopy results indicate that there is an ultrafast spin to charge conversion at the FM/perovskite interface, resulting in asymmetrical THz emission. Further pump polarization dependent THz emission shows that such THz emission can be coherently tuned.
Secondly, I will discuss improving the mechanical reliability of perovskite PV, particularly beneficial for space application. Specifically, I will show that incorporating a long alkly chain molecule (n-octylammonium iodide, OAI) into the perovskite active layer can release its residual stress. This incorporation greatly enhanced the thermal cycling performance of perovskite PV devices in both n-i-p and p-i-n configuration. Femstosecond-nanosecond TAS shows that devices with OAI have good charge transport properties at the perovskite/transport layer interface, whereas devices without OAI suffered from surface delamination and thus hindered charge transport at the interface.
This work is supported by the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science, within the US Department of Energy.
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