Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
Hybrid perovskites are emerging as top contenders in the next generation of photovoltaics, yet their stability under operational conditions remains a significant challenge. Specifically, degradation occurs at the interface with charge transport layers in perovskite solar cells during operation.[1] To address this, we explore using supramolecular interfacial modulators at the interface of charge-transport layers with the purpose of suppressing degradation without interfering with the photovoltaic performance.[2,3] This included functionalised triarylamine-based modulators, which are known to form hole-transporting supramolecular stacks,[2] as well as chiral P,M-(1-methylene-3-methyl-imidazolium)[6]helicene iodides, which could contribute to the charge transport through chiral-induced spin-selectivity (CISS) effects. These modulators were applied at the interface between the perovskite active layer and the hole-transporting material in conventional perovskite solar cells (Figure 1). We have investigated their impact on the structural characteristics and optoelectronic properties via a combination of techniques, including X-ray diffraction, UV-vis and both steady-state and time-resolved photoluminescence spectroscopy, complemented with the further analysis of photovoltaic devices. Our investigation challenges the role of chirality in perovskite photovoltaics and reveals the contribution to the improvement of operational stabilities without compromising device performance, offering promising new strategies for advancing perovskite photovoltaics.[3]
This project received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no. 764047. G.A. and J.V.M. acknowledges the SNSF Grant no. 193174. M.A. acknowledges King Abdulaziz City for Science and Technology (KACST) for the fellowship. The work of D.D. and B.E. is part of the Dutch Research Council (NWO) project no. KICH1.ED02.20.007 performed at the institute AMOLF. The authors are grateful to Olivier Ouellette (EPFL) for support with the PL spectroscopy and data analysis. We are further grateful to the ESRF (proposal no. a0121290) for the synchrotron-based measurements and the beamline scientists in Grenoble for their invaluable support. Parts of the research were done at SOLEIL (Paris, France). The authors gratefully acknowledge support by Andrea Resta and Alessandro Coati from beamline SIXS (SOLEIL). We acknowledge funding from the BMBF (ERUM-Pro) project 05K19VTA and thank Niels Scheffczyk and Leonard Simeonov for their experimental support.
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