Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.167
Publication date: 22nd December 2022
Inorganic cesium lead iodide (CsPbI3) perovskite solar cells (PSCs) have attracted enormous attention due to their promising thermal stability and optical bandgap (~1.73 eV), making them particularly well-suited for tandem device applications. Although the performance of CsPbI3 PSCs has surged to over 20%, most high-performance devices are fabricated using the dimethylammoniumiodide (DMAI)-assisted method, which hinders the options for mass production. Furthermore, the potential presence of the organic component DMA in the final CsPbI3 films remains under debate. Therefore, it is imperative to develop a plethora of methods to fabricate highly phase-pure CsPbI3 thin films. However, many methods of fabricating such CsPbI3 films require processing at high-temperatures (~340 ℃), which limits their applicability on flexible substrates. Thus, it is still challenging to achieve high-performing photovoltaic devices processed at low temperatures.
Here we reported a new method to fabricate high-efficiency and stable γ-CsPbI3 PSCs at low temperatures (~180 ℃) by introducing long-chain organic cation salt ethane-1,2-diammonium iodide (EDAI2) and regulating the content of lead acetate (Pb(OAc)2) in the perovskite precursor solution. By optimizing the excess amount of Pb(OAc)2 in the precursor solution, we demonstrate improved crystallinity, morphology and reduced carrier recombination are observed in the EDAI2 and Pb(OAc)2 synergistically stabilized CsPbI3 films. By optimizing the hole transport layer of CsPbI3 inverted architecture solar cells, we demonstrate efficiencies of up to 16.6%, which surpass previous reports examining γ-CsPbI3 in inverted PSCs. Notably, the encapsulated solar cells maintain 97% of their initial efficiency at room temperature and dim light for 25 days, demonstrating the synergistic effect of EDAI2 and Pb(OAc)2 in stabilizing γ-CsPbI3 PSCs.
Z. Z. and R.J. are grateful for the financial support by the China Scholarship Council (Scholarship#201806750012 and #201806070145, respectively). Z.Z thanks short-term scholarship from the Graduate Academy of Technische Universität Dresden. Z.Z also thanks the Dresden Center for Nanoanalysis (DCN) for providing access to the SEM measurement. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Grant Agreement n° 714067, ENERGYMAPS) and the Deutsche Forschungsgemeinschaft (DFG) in the framework of the Special Priority Program (SPP 2196) project PERFECT PVs (#424216076).
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