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      A Review of Perovskites Solar Cell Stability

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          Dye-sensitized solar cells.

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            Efficient and stable large-area perovskite solar cells with inorganic charge extraction layers.

            The recent dramatic rise in power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) has triggered intense research worldwide. However, high PCE values have often been reached with poor stability at an illuminated area of typically less than 0.1 square centimeter. We used heavily doped inorganic charge extraction layers in planar PSCs to achieve very rapid carrier extraction, even with 10- to 20-nanometer-thick layers, avoiding pinholes and eliminating local structural defects over large areas. The robust inorganic nature of the layers allowed for the fabrication of PSCs with an aperture area >1 square centimeter that have a PCE >15%, as certified by an accredited photovoltaic calibration laboratory. Hysteresis in the current-voltage characteristics was eliminated; the PSCs were stable, with >90% of the initial PCE remaining after 1000 hours of light soaking.
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              Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers.

              Dye-sensitized solar cells have gained widespread attention in recent years because of their low production costs, ease of fabrication and tunable optical properties, such as colour and transparency. Here, we report a molecularly engineered porphyrin dye, coded SM315, which features the prototypical structure of a donor-π-bridge-acceptor and both maximizes electrolyte compatibility and improves light-harvesting properties. Linear-response, time-dependent density functional theory was used to investigate the perturbations in the electronic structure that lead to improved light harvesting. Using SM315 with the cobalt(II/III) redox shuttle resulted in dye-sensitized solar cells that exhibit a high open-circuit voltage VOC of 0.91 V, short-circuit current density JSC of 18.1 mA cm(-2), fill factor of 0.78 and a power conversion efficiency of 13%.
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                Author and article information

                Journal
                Advanced Functional Materials
                Adv. Funct. Mater.
                Wiley
                1616301X
                February 12 2019
                : 1808843
                Affiliations
                [1 ]Department of Materials Science and Engineering; University of California at Los Angeles; Los Angeles CA 90095 USA
                [2 ]State Key Laboratory on Integrated Optoelectronics; College of Electronic Science and Engineering; Jilin University; Changchun 130012 China
                [3 ]Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices; Institute of Functional Nano & Soft Materials (FUNSOM); Soochow University; Suzhou 215123 China
                Article
                10.1002/adfm.201808843
                4616884a-fa7b-4c43-a596-bb7ae1096ffc
                © 2019

                http://doi.wiley.com/10.1002/tdm_license_1.1

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