Enhanced Performance of Sn-Based Perovskite Solar Cells by Two-Dimensional Perovskite Doping,ACS Sustainable Chemistry & Engineering

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Enhanced Performance of Sn-Based Perovskite Solar Cells by Two-Dimensional Perovskite Doping
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-05-18 , DOI: 10.1021/acssuschemeng.0c01216
Junming Li ₁ , Ping Hu ₁ , Yumin Chen ₁ , Yafeng Li ₁ , Mingdeng Wei _{1,

2}

Affiliation

The poor performance of tin (Sn)-based perovskite solar cells (PSCs) is mainly due to the easy oxidation of Sn²⁺ to Sn⁴⁺, the low formation energy of Sn vacancies, and the unbalanced rates between nucleation and crystal growth in Sn-based perovskite films. In this study, a small amount of two-dimensional tetra-n-butylammonium (TBA) cation is doped in Sn-based perovskite for the first time, which effectively passivates film defects. TBA cation doping leads to improved surface coverage, suppressed Sn²⁺/Sn⁴⁺ oxidation, and reduced background charge carrier density in mixed perovskite films. Consequently, the efficiency of TBA-doped formamidinium tin triiodide (FASnI₃) and cesium tin triiodide (CsSnI₃) cells is greatly improved from 4.0 to 7.0% and from 1.3 to 2.8%, respectively.

中文翻译：

二维钙钛矿掺杂增强了锡基钙钛矿太阳能电池的性能

锡（Sn）钙钛矿太阳能电池（PSC）的性能不佳主要是由于Sn ²⁺易于氧化成Sn ^{4 +}，Sn空位的形成能低以及成核和晶体生长速率不平衡所致。锡基钙钛矿薄膜。在这项研究中，第一次在Sn基钙钛矿中掺杂了少量的二维四正丁基铵（TBA）阳离子，从而有效地钝化了膜缺陷。TBA阳离子掺杂可提高表面覆盖率，抑制Sn ²⁺ / Sn ^4+的氧化，并降低混合钙钛矿薄膜中的背景电荷载流子密度。因此，TBA掺杂的三碘化甲ami锡（FASnI ₃）和三碘化铯锡（CsSnI ₃）电池分别从4.0％改善到7.0％和从1.3％改善到2.8％。

更新日期：2020-05-18

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