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      Room-Temperature Atomic-Layer-Deposited Al2 O3 Improves the Efficiency of Perovskite Solar Cells over Time

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          Most cited references 22

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          Solvent engineering for high-performance inorganic-organic hybrid perovskite solar cells.

          Organolead trihalide perovskite materials have been successfully used as light absorbers in efficient photovoltaic cells. Two different cell structures, based on mesoscopic metal oxides and planar heterojunctions have already demonstrated very impressive advances in performance. Here, we report a bilayer architecture comprising the key features of mesoscopic and planar structures obtained by a fully solution-based process. We used CH3NH3 Pb(I(1-x)Br(x))3 (x = 0.1-0.15) as the absorbing layer and poly(triarylamine) as a hole-transporting material. The use of a mixed solvent of γ-butyrolactone and dimethylsulphoxide (DMSO) followed by toluene drop-casting leads to extremely uniform and dense perovskite layers via a CH3NH3I-PbI2-DMSO intermediate phase, and enables the fabrication of remarkably improved solar cells with a certified power-conversion efficiency of 16.2% and no hysteresis. These results provide important progress towards the understanding of the role of solution-processing in the realization of low-cost and highly efficient perovskite solar cells.
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            Improving the Long-Term Stability of Perovskite Solar Cells with a Porous Al2O3 Buffer Layer.

            Hybrid perovskites represent a new paradigm for photovoltaics, which have the potential to overcome the performance limits of current technologies and achieve low cost and high versatility. However, an efficiency drop is often observed within the first few hundred hours of device operation, which could become an important issue. Here, we demonstrate that the electrode's metal migrating through the hole transporting material (HTM) layer and eventually contacting the perovskite is in part responsible for this early device degradation. We show that depositing the HTM within an insulating mesoporous "buffer layer" comprised of Al2O3 nanoparticles prevents the metal electrode migration while allowing for precise control of the HTM thickness. This enables an improvement in the solar cell fill factor and prevents degradation of the device after 350 h of operation.
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              Improvement of the humidity stability of organic–inorganic perovskite solar cells using ultrathin Al2O3 layers prepared by atomic layer deposition

              The high polarity of water molecules inevitably causes the decomposition of perovskites. We retard the degradation by introducing an ultrathin ALD–Al2O3 layer, which has almost no negative effect on performance.
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                Author and article information

                Journal
                ChemSusChem
                ChemSusChem
                Wiley
                18645631
                October 24 2018
                October 24 2018
                September 26 2018
                : 11
                : 20
                : 3640-3648
                Affiliations
                [1 ]Applied Physics and Sensors; Brandenburg University of Technology Cottbus-Senftenberg; Konrad-Wachsmann-Allee 17 03046 Cottbus Germany
                [2 ]Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Institut für Silizium-Photovoltaik; Kekuléstrasse 5 12489 Berlin Germany
                [3 ]Surface Science Division, Department of Materials Science; Technical University Darmstadt; Otto-Berndt-Strasse 3 64289 Darmstadt Germany
                [4 ]Charles University; Faculty of Mathematics and Physics; Department of Surface and Plasma Science; V Holešovičkách 2 18000 Prague 8 Czech Republic
                [5 ]Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Young Investigators Group Perowskite Tandem Solar Cells; Kekuléstrasse 5 12489 Berlin Germany
                10.1002/cssc.201801434
                © 2018

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

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