Investigation of Hole Transport Layers for Lead-Tin Perovskite Solar Cells
Daphne Dekker a, Bart Roose b, Bruno Ehrler a
a Light Management in New Photovoltaic Materials (LMPV), AMOLF, Amsterdam, The Netherlands
b Optoelectronics Group, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, UK
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Poster, Daphne Dekker, 280
Publication date: 30th March 2023

Because of their ideal band gap for all-perovskite tandem solar cells and high efficiency single junction solar cells, mixed lead-tin perovskites have recently received a lot of attention [1]. Currently, the hole transport layer (HTL) most commonly used for lead-tin perovskite solar cells is poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). However, this hygroscopic material has been shown to cause long term stability issues in devices, so many research groups have started using self-assembled monolayers (SAMs) of small organic molecules, like [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz), as an HTL instead. [2] This study aims to find mechanistic insights into the differences in performance and stability caused by these different transport layers. To do this, we investigate the evolution of the performance of mixed lead-tin perovskite solar cells over time during continuous illumination, using either PEDOT:PSS or 2PACz as an HTL. We find clear differences between the stability of PEDOT:PSS-containing and 2PACz-containing devices, for measurements both in inert atmosphere and in ambient air. We also study the photoluminescence and photoluminescence lifetime of these devices, to probe their optoelectronic properties. We aim to link the observed differences in performance and stability between these two different HTLs to optoelectronic properties of the devices as derived from photoluminescence and photoluminescence lifetime data.

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