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      All Inorganic Halide Perovskites Nanosystem: Synthesis, Structural Features, Optical Properties and Optoelectronic Applications

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          Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates.

          Organometal trihalide perovskite solar cells offer the promise of a low-cost easily manufacturable solar technology, compatible with large-scale low-temperature solution processing. Within 1 year of development, solar-to-electric power-conversion efficiencies have risen to over 15%, and further imminent improvements are expected. Here we show that this technology can be successfully made compatible with electron acceptor and donor materials generally used in organic photovoltaics. We demonstrate that a single thin film of the low-temperature solution-processed organometal trihalide perovskite absorber CH3NH3PbI3-xClx, sandwiched between organic contacts can exhibit devices with power-conversion efficiency of up to 10% on glass substrates and over 6% on flexible polymer substrates. This work represents an important step forward, as it removes most barriers to adoption of the perovskite technology by the organic photovoltaic community, and can thus utilize the extensive existing knowledge of hybrid interfaces for further device improvements and flexible processing platforms.
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            Efficient and stable large-area perovskite solar cells with inorganic charge extraction layers.

             W Chen,  Y. Wu,  Y. Yue (2015)
            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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              Quantum dot-induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics.

              We show nanoscale phase stabilization of CsPbI3 quantum dots (QDs) to low temperatures that can be used as the active component of efficient optoelectronic devices. CsPbI3 is an all-inorganic analog to the hybrid organic cation halide perovskites, but the cubic phase of bulk CsPbI3 (α-CsPbI3)-the variant with desirable band gap-is only stable at high temperatures. We describe the formation of α-CsPbI3 QD films that are phase-stable for months in ambient air. The films exhibit long-range electronic transport and were used to fabricate colloidal perovskite QD photovoltaic cells with an open-circuit voltage of 1.23 volts and efficiency of 10.77%. These devices also function as light-emitting diodes with low turn-on voltage and tunable emission.
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                Author and article information

                Journal
                Small
                Small
                Wiley
                16136810
                March 2017
                March 2017
                January 09 2017
                : 13
                : 9
                : 1603996
                Affiliations
                [1 ]MIIT Key Laboratory of Advanced Display Materials and Devices; Institute of Optoelectronics & Nanomaterials; College of Materials Science and Engineering; Nanjing University of Science and Technology; Nanjing 210094 China
                [2 ]State Key Laboratory of Mechanics and Control of Mechanical Structures; College of Materials Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 China
                Article
                10.1002/smll.201603996
                © 2017

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