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<p>Although perovskite/organic tandem solar cells have many advantages, their power conversion efficiency (PCE) still substantially lags behind their perovskite/perovskite counterparts. One of the main reasons is the low external quantum efficiency and high energy loss of the rear subcell. In this work, guided by the semi-empirical analysis, the most suitable available material combination has been obtained. To further improve the photovoltaic performance of the organic rear cells, isopropanol has been used as a co-solvent additive to finely tune the bulk heterojunction morphology of the active layer. Together with the optimization of each subcell, a remarkable PCE of 26.49% (certified 25.56%) with a high open-circuit voltage of 2.214&#xa0;V has been achieved for the perovskite/organic tandem device.</p>

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Perovskite/Organic Tandem Solar Cells with 26.49% Efficiency via Enhanced Absorption and Minimized Energy Losses

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月5日

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  • Bing Guo,
  • Jiaqi Li,
  • Ruihan Wu,
  • Haozhe He,
  • Senyao Wang,
  • Longyu Li,
  • Wenkai Zhao,
  • Jinyuan Zhang,
  • Lei Meng,
  • Guankui Long,
  • Zhaoyang Yao,
  • Xiangjian Wan,
  • Yongfang Li,
  • Yongsheng Chen

摘要

Although perovskite/organic tandem solar cells have many advantages, their power conversion efficiency (PCE) still substantially lags behind their perovskite/perovskite counterparts. One of the main reasons is the low external quantum efficiency and high energy loss of the rear subcell. In this work, guided by the semi-empirical analysis, the most suitable available material combination has been obtained. To further improve the photovoltaic performance of the organic rear cells, isopropanol has been used as a co-solvent additive to finely tune the bulk heterojunction morphology of the active layer. Together with the optimization of each subcell, a remarkable PCE of 26.49% (certified 25.56%) with a high open-circuit voltage of 2.214 V has been achieved for the perovskite/organic tandem device.