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      Hydrobromic acid assisted crystallization of MAPbI 3−xCl x for enhanced power conversion efficiency in perovskite solar cells

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          Abstract

          Enhanced performance of perovskite solar cells based on the application of high quality MAPbI 3−xCl x films developed via a hydrobromic acid assisted fast crystallization process is reported.

          Abstract

          Enhanced performance of perovskite solar cells based on the application of high quality MAPbI 3−xCl x films developed via a hydrobromic acid assisted fast crystallization process is reported. A current density ( J sc) of 21.71 mA cm −2, an open circuit voltage ( V oc) of 0.94 V, a fill factor (FF) of 0.77 and a high power conversion efficiency (PCE) of 15.76% were obtained. Noticeably, the hydrobromic acid assisted device exhibited less hysteresis and followed a crystallization route which is several times faster than that of the traditional one-step spin-coating method. The enhancement in device performance is attributed to the increased parallel resistance, lower leakage current, reduced series resistance and stronger crystallization of the MAPbI 3−xCl x perovskite layer.

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          Photovoltaics. Interface engineering of highly efficient perovskite solar cells.

          Huanping Zhou, Qi Chen, Gang Li … (2014)
          Advancing perovskite solar cell technologies toward their theoretical power conversion efficiency (PCE) requires delicate control over the carrier dynamics throughout the entire device. By controlling the formation of the perovskite layer and careful choices of other materials, we suppressed carrier recombination in the absorber, facilitated carrier injection into the carrier transport layers, and maintained good carrier extraction at the electrodes. When measured via reverse bias scan, cell PCE is typically boosted to 16.6% on average, with the highest efficiency of ~19.3% in a planar geometry without antireflective coating. The fabrication of our perovskite solar cells was conducted in air and from solution at low temperatures, which should simplify manufacturing of large-area perovskite devices that are inexpensive and perform at high levels. Copyright © 2014, American Association for the Advancement of Science.
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            Efficient luminescent solar cells based on tailored mixed-cation perovskites

            Dongqin Bi, Wolfgang Tress, M Ibrahim Dar … (2016)
            Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%).
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              Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid ω-ammonium chlorides.

              Xiong Li, M Ibrahim Dar, Chenyi Yi … (2015)
              In the past few years, organic-inorganic halide perovskites have rapidly emerged as promising materials for photovoltaic applications, but simultaneously achieving high performance and long-term stability has proved challenging. Here, we show a one-step solution-processing strategy using phosphonic acid ammonium additives that results in efficient perovskite solar cells with enhanced stability. We modify the surface of methylammonium lead triiodide (CH3NH3PbI3) perovskite by spin-coating its precursor solution in the presence of butylphosphonic acid 4-ammonium chloride. Morphological, structural and elemental analyses show that the phosphonic acid ammonium additive acts as a crosslink between neighbouring grains in the perovskite structure, through strong hydrogen bonding of the -PO(OH)2 and -NH3(+) terminal groups to the perovskite surface. The additives facilitate the incorporation of the perovskite within a mesoporous TiO2 scaffold, as well as the growth of a uniform perovskite layer at the surface, enhancing the material's photovoltaic performance from 8.8 to 16.7% as well as its resistance to moisture.
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                Author and article information

                Journal
                Journal ID (publisher-id): RSCACL
                Title: RSC Advances
                Abbreviated Title: RSC Adv.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Electronic): 2046-2069
                Publication date Created: 2016
                Publication date (Electronic): 2016
                Volume: 6
                Issue: 61
                Pages: 55720-55725
                Affiliations
                [1 ]Electronic Materials Research Laboratory (EMRL)
                [2 ]Key Laboratory of the Ministry of Education
                [3 ]International Center for Dielectric Research
                [4 ]Xi'an Jiaotong University
                [5 ]Xi'an 710049
                [6 ]College of Science
                [7 ]Shaanxi University of Science and Technology
                [8 ]Xi'an 710021
                [9 ]China
                Article
                DOI: 10.1039/C6RA07536C
                SO-VID: 14110566-44e9-40e9-af93-5fdc7bda8995
                Copyright © © 2016
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