Multifunctional Molecular Modulation for Stable and Efficient Hybrid Perovskite Solar Cells
Jovana Milic a, Dominik Kubicki a b, Dongqin Bi a, Xiong Li a, Lyndon Emsley b, Michael Graetzel a
a Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
b Laboratory of Magnetic Resonance, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
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, Jovana Milic, 008
Publication date: 11th February 2019

While hybrid perovskite solar cells exhibit remarkable power conversion efficiencies, the challenges associated with their limited stability, scalability, and molecular-level engineering remain unresolved.[1-2] Although some of these limitations could be overcome by employing electronically compatible and hermetically sealing hydrophobic materials, enhanced stabilities are mostly achieved at the expense of the efficiency of the corresponding devices.[3-5] Our alternative strategy provides stabilization without compromising the efficiency by utilizing judiciously designed multifunctional molecular modulators (MMMs) through fine-tuning of noncovalent interactions complemented by structural adaptability.[2,4-5] These systems are designed to interact with the perovskite surface in a manner uniquely assessed by solid-state NMR spectroscopy.[2,4] As a result, we realize novel layered two-dimensional perovskite materials[6] and obtain durable and scalable perovskite solar cells with superior properties and efficiencies exceeding 20% for formamidinium cesium mixed lead iodide perovskite compositions, accompanied by elevated tolerance to environmental factors.[2] This approach has been investigated by using a combination of techniques, including scanning electron microscopy, cathodoluminescence mapping, X-ray diffraction, and photoluminescence spectroscopy in conjunction with solid-state NMR spectroscopy to unravel the underlying mode of action and exemplify the advantages of multifunctional molecular modulation in perovskite solar cell research.

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