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      Improving efficiency and stability of perovskite solar cells with photocurable fluoropolymers.

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          Abstract

          Organometal halide perovskite solar cells have demonstrated high conversion efficiency but poor long-term stability against ultraviolet irradiation and water. We show that rapid light-induced free-radical polymerization at ambient temperature produces multifunctional fluorinated photopolymer coatings that confer luminescent and easy-cleaning features on the front side of the devices, while concurrently forming a strongly hydrophobic barrier toward environmental moisture on the back contact side. The luminescent photopolymers re-emit ultraviolet light in the visible range, boosting perovskite solar cells efficiency to nearly 19% under standard illumination. Coated devices reproducibly retain their full functional performance during prolonged operation, even after a series of severe aging tests carried out for more than 6 months.

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          Efficient luminescent solar cells based on tailored mixed-cation perovskites

          Dongqin Bi, Wolfgang Tress, M Ibrahim Dar … (2016)
          Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%).
          Article 0 comments Cited 533 times – based on 0 reviews     Review now
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            Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid ω-ammonium chlorides.

            Xiong Li, M Ibrahim Dar, Chenyi Yi … (2015)
            In the past few years, organic-inorganic halide perovskites have rapidly emerged as promising materials for photovoltaic applications, but simultaneously achieving high performance and long-term stability has proved challenging. Here, we show a one-step solution-processing strategy using phosphonic acid ammonium additives that results in efficient perovskite solar cells with enhanced stability. We modify the surface of methylammonium lead triiodide (CH3NH3PbI3) perovskite by spin-coating its precursor solution in the presence of butylphosphonic acid 4-ammonium chloride. Morphological, structural and elemental analyses show that the phosphonic acid ammonium additive acts as a crosslink between neighbouring grains in the perovskite structure, through strong hydrogen bonding of the -PO(OH)2 and -NH3(+) terminal groups to the perovskite surface. The additives facilitate the incorporation of the perovskite within a mesoporous TiO2 scaffold, as well as the growth of a uniform perovskite layer at the surface, enhancing the material's photovoltaic performance from 8.8 to 16.7% as well as its resistance to moisture.
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              Not All That Glitters Is Gold: Metal-Migration-Induced Degradation in Perovskite Solar Cells

              Konrad Domanski, Juan-Pablo Correa-Baena, Nicolas Mine … (2016)
              Perovskite solar cells (PSCs) have now achieved efficiencies in excess of 22%, but very little is known about their long-term stability under thermal stress. So far, stability reports have hinted at the importance of substituting the organic components, but little attention has been given to the metal contact. We investigated the stability of state-of-the-art PSCs with efficiencies exceeding 20%. Remarkably, we found that exposing PSCs to a temperature of 70 °C is enough to induce gold migration through the hole-transporting layer (HTL), spiro-MeOTAD, and into the perovskite material, which in turn severely affects the device performance metrics under working conditions. Importantly, we found that the main cause of irreversible degradation is not due to decomposition of the organic and hybrid perovskite layers. By introducing a Cr metal interlayer between the HTL and gold electrode, high-temperature-induced irreversible long-term losses are avoided. This key finding is essential in the quest for achieving high efficiency, long-term stable PSCs which, in order to be commercially viable, need to withstand hard thermal stress tests.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): Science
                Title: Science (New York, N.Y.)
                Publisher: American Association for the Advancement of Science (AAAS)
                ISSN (Electronic): 1095-9203
                ISSN (Print): 0036-8075
                Publication date (Electronic): October 14 2016
                Volume: 354
                Issue: 6309
                Affiliations
                [1 ] Group for Applied Materials and Electrochemistry (GAME Lab), CHENERGY Group, Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy. federico.bella@polito.it gianmarco.griffini@polimi.it anders.hagfeldt@epfl.ch.
                [2 ] Department of Chemistry, Materials and Chemical Engineering "Giulio Natta," Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy. federico.bella@polito.it gianmarco.griffini@polimi.it anders.hagfeldt@epfl.ch.
                [3 ] Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Chemin des Alambics, Station 3, 1015, Lausanne, Switzerland.
                [4 ] Center for Sustainable Futures @PoliTO, Istituto Italiano di Tecnologia, Corso Trento 21, 10129, Torino, Italy.
                [5 ] Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, 1015, Lausanne, Switzerland.
                [6 ] Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Chemin des Alambics, Station 3, 1015, Lausanne, Switzerland. federico.bella@polito.it gianmarco.griffini@polimi.it anders.hagfeldt@epfl.ch.
                [7 ] Department of Chemistry, Materials and Chemical Engineering "Giulio Natta," Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
                [8 ] Group for Applied Materials and Electrochemistry (GAME Lab), CHENERGY Group, Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy.
                Article
                Publisher Item ID: science.aah4046
                DOI: 10.1126/science.aah4046
                PubMed ID: 27708051
                SO-VID: 3416da6c-c489-4de3-a6a8-eae8305c56e5
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