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      Voltage output of efficient perovskite solar cells with high open-circuit voltage and fill factor

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          Abstract

          The voltage output of perovskite solar cells is found to be dependent on both the energy level of perovskite itself as a solar absorber and hole transporting materials.

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

          Pablo Docampo, James Ball, Mariam Darwich … (2013)
          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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            High performance hybrid solar cells sensitized by organolead halide perovskites

            Zhou Yang, Wen-Hua Zhang, Jieshan Qiu … (2013)
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              Role of the Selective Contacts in the Performance of Lead Halide Perovskite Solar Cells.

              Emilio Juarez-Perez, Michael Wuβler, Francisco Fabregat-Santiago … (2014)
              The effect of electron- and hole-selective contacts in the final cell performance of hybrid lead halide perovskite, CH3NH3PbI3, solar cells has been systematically analyzed by impedance spectroscopy. Complete cells with compact TiO2 and spiro-OMeTAD as electron- and hole-selective contacts have been compared with incomplete cells without one or both selective contacts to highlight the specific role of each contact. It has been described how selective contacts contribute to enhance the cell FF and how the hole-selective contact is mainly responsible for the high Voc in this kind of device. We have determined that the recombination rate is mainly governed by the selective contacts. This fact has important implication for the future optimization of perovskite solar cells. Finally, we have developed a method to analyze the results obtained, and it has been applied for three different electron-selecting materials: TiO2, ZnO, and CdS.
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                Author and article information

                Journal
                Journal ID (publisher-id): EESNBY
                Title: Energy Environ. Sci.
                Abbreviated Title: Energy Environ. Sci.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 1754-5692
                ISSN (Electronic): 1754-5706
                Publication date Created: 2014
                Publication date (Print): 2014
                Volume: 7
                Issue: 8
                Pages: 2614-2618
                Article
                DOI: 10.1039/C4EE00762J
                SO-VID: 479fcbf2-fbdc-47c6-aa6a-c0005dac7422
                Copyright © © 2014
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