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      Highly efficient low temperature solution processable planar type CH3NH3PbI3 perovskite flexible solar cells

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          Abstract

          A highly efficient PEN/ITO/ZnO/CH 3NH 3PbI 3 perovskite/PTAA/Au flexible planar solar cell with 1.1 V V oc, 18.7 mA cm −2 J sc, 75% FF, and 15.4% η for the forward scan direction and 1.1 V V oc, 18.7 mA cm −2 J sc, 76% FF and 15.6% η for the reverse scan direction under illumination of 1 Sun was demonstrated.

          Abstract

          The current density–voltage ( JV) hysteresis and power conversion efficiency ( η) of planar type CH 3NH 3PbI 3 perovskite solar cells with TiO 2 and ZnO electron conductors, which are formed by high temperature spray pyrolysis deposition at 450 °C and by room temperature spin-coating and subsequent heat-treatment at 150 °C, respectively, were compared. The ZnO based perovskite solar cells exhibited better efficiency deviation (15.96 ± 1.07%) and less JV hysteresis than the TiO 2 based cells (15.20 ± 1.23%) because the ZnO based cell has 1.2 fold longer charge carrier life time ( τ n) than the ZnO based cell and the ZnO electron conductor has better electron conductivity (0.0031 mS cm −1) than the TiO 2 electron conductor (0.00006 mS cm −1), thereby balancing the electron flux and the hole flux more. Due to the low temperature solution processability of the ZnO electron conductor, we could demonstrate a highly efficient PEN (poly-ethylenenaphthalate)/ITO/ZnO/CH 3NH 3PbI 3 perovskite/PTAA/Au flexible planar solar cell with 1.1 V open-circuit voltage ( V oc), 18.7 short-circuit current density (mA cm −2) J sc, 75% fill factor (FF), and 15.4% η for the forward scan direction and 1.1 V V oc, 18.7 mA cm −2 J sc, 76% FF and 15.6% η for the reverse scan direction under illumination of 1 Sun.

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          Most cited references 36

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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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            Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide.

            High efficiency perovskite solar cells were fabricated reproducibly via Lewis base adduct of lead(II) iodide. PbI2 was dissolved in N,N-dimethyformamide with equimolar N,N-dimethyl sulfoxide (DMSO) and CH3NH3I. Stretching vibration of S═O appeared at 1045 cm(-1) for bare DMSO, which was shifted to 1020 and 1015 cm(-1) upon reacting DMSO with PbI2 and PbI2 + CH3NH3I, respectively, indicative of forming the adduct of PbI2·DMSO and CH3NH3I·PbI2·DMSO due to interaction between Lewis base DMSO and/or iodide (I(-)) and Lewis acid PbI2. Spin-coating of a DMF solution containing PbI2, CH3NH3I, and DMSO (1:1:1 mol %) formed a transparent adduct film, which was converted to a dark brown film upon heating at low temperature of 65 °C for 1 min due to removal of the volatile DMSO from the adduct. The adduct-induced CH3NH3PbI3 exhibited high charge extraction characteristics with hole mobility as high as 3.9 × 10(-3) cm(2)/(V s) and slow recombination rate. Average power conversion efficiency (PCE) of 18.3% was achieved from 41 cells and the best PCE of 19.7% was attained via adduct approach.
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              Hysteresis-less inverted CH3NH3PbI3planar perovskite hybrid solar cells with 18.1% power conversion efficiency

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                Author and article information

                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                2016
                2016
                : 4
                : 5
                : 1572-1578
                Article
                10.1039/C5TA09520D
                © 2016
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C5TA09520D

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