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首页> 外文期刊>Advanced energy materials >Reducing Saturation-Current Density to Realize High- Efficiency Low-Bandgap Mixed Tin–Lead Halide Perovskite Solar Cells
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Reducing Saturation-Current Density to Realize High- Efficiency Low-Bandgap Mixed Tin–Lead Halide Perovskite Solar Cells

机译：降低饱和电流密度以实现高效率，低带隙的混合锡铅卤化物钙钛矿太阳能电池

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摘要

The unsatisfactory performance of low-bandgap mixed tin (Sn)-lead (Pb) halide perovskite subcells has been one of the major obstacles hindering the progress of the power conversion efficiencies (PCEs) of all-perovskite tandem solar cells. By analyzing dark-current density and distribution, it is identified that charge recombination at grain boundaries is a key factor limiting the performance of low-bandgap mixed Sn-Pb halide perovskite subcells. It is further found that bromine (Br) incorporation can effectively passivate grain boundaries and lower the dark current density by two-three orders of magnitude. By optimizing the Br concentration, low-bandgap (1.272 eV) mixed Sn-Pb halide perovskite solar cells are fabricated with open-circuit voltage deficits as low as 0.384 V and fill factors as high as 75%. The best-performing device demonstrates a PCE of 19%. The results suggest an important direction for improving the performance of low-bandgap mixed Sn-Pb halide perovskite solar cells.
机译：低带隙混合锡（Sn）-铅（Pb）卤化物钙钛矿子电池的不令人满意的性能一直是阻碍全钙钛矿串联太阳能电池功率转换效率（PCE）发展的主要障碍之一。通过分析暗电流密度和分布，可以确定晶界处的电荷复合是限制低带隙混合Sn-Pb卤化物钙钛矿亚电池性能的关键因素。进一步发现，掺入溴（Br）可以有效地钝化晶界，并使暗电流密度降低2-3个数量级。通过优化Br浓度，可以制造低带隙（1.272 eV）的混合Sn-Pb卤化物钙钛矿型太阳能电池，其开路电压缺陷低至0.384 V，填充因子高至75％。表现最佳的设备的PCE大于19％。该结果表明了改善低带隙混合Sn-Pb卤化物钙钛矿太阳能电池性能的重要方向。

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  • 来源
    《Advanced energy materials》 |2019年第3期|1803135.1-1803135.9|共9页
  • 作者

    Li Chongwen; Song Zhaoning; Zhao Dewei; Xiao Chuanxiao; Subedi Biwas; Shrestha Niraj; Junda Maxwell M.; Wang Changlei; Jiang Chun-Sheng; Al-Jassim Mowafak; Ellingson Randy J.; Podraza Nikolas J.; Zhu Kai; Yan Yanfa;

  • 作者单位

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA;

    Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

    Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA;

    Univ Toledo, Dept Phys & Astron, 2801 W Bancroft St, Toledo, OH 43606 USA|Univ Toledo, Wright Ctr Photovolta Innovat & Commercializat, 2801 W Bancroft St, Toledo, OH 43606 USA;

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  • 正文语种 eng
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  • 关键词

    dark saturation current; grain boundary passivation; low-bandgap perovskites; perovskite solar cells;

    机译：暗饱和电流;晶界钝化;低带隙钙钛矿;钙钛矿太阳能电池;

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