Molecularly Engineered 2D /3D Perovskites Based on Quaternary Ammonium Cation for Stable and Efficient Perovskite Solar Cells
Anurag Krishna a, MohammadAli Akhavan Kazemi a, Sébastien Gottis a, Frédéric Sauvage a
a Laboratoire de Réactivité et Chimie des Solides (LRCS) UMR CNRS 7314 - Institut de Chimie de Picardie FR 3085 Université de Picardie Jules Verne 33 rue Saint Leu, FR-80039 Amiens Cedex, France
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Anurag Krishna, 150
Publication date: 11th February 2019

The cost-effective processability and high efficiency of the organic-inorganic metal halide perovskite solar cells (PSCs) have shown tremendous potential to intervene positively in the generation of clean energy [1-3]. However, prior to an industrial scale-up process, there are certain critical issues that require to be addressed such as the lack of stability against moisture, light, and heat [4-7]. Cation engineering at A-site in 3D perovskite (ABX3) absorbers has led to reduced degradation, even though it is still far from meeting requirements for commercialization [8,9]. In this work, we introduce a novel quaternary ammonium cation in A-site along with methylammonium (MA) to create a molecularly engineered 2D/3D mixed system. These 2D/3D perovskites show improved morphology, optoelectronic properties and hydrophilicity compared to the 3D counterpart. The 2D/3D perovskites layer with less than 5 mol.% of 2D shows hampering in non-radiative charge recombination leading to a higher open-circuit voltage compared to 3D perovskite-based cells. Optimized 2D/3D devices reached PCE over 17% while without external unencapsulation retain more than 90% of the initial performance for over 1000 hours under ambient conditions (RH ~ 50 - 60 %) and even under maintaining stability under extreme humidity (RH ~ 90%). In this communication, performances, photophysics and stability characteristics will be thoroughly discussed for which we believe can lead to a paradigm shift in the future design of mesotextured perovskite absorbers for stable PSCs.   

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