揭示流行的PEDOT: pss衍生的锡铅混合钙钛矿太阳能电池中的成分偏析效应及其消除

IF 4.6 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2025-02-26 DOI:10.1021/acs.jpclett.4c03648

Qiang Sun, Zhaoning Li, Tianle Cheng, Guoqiang Ma, Dong He, Gangsen Su, Haojie Chen, Longwei Yin, Zhubing He

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引用次数: 0

摘要

聚（3,4-乙烯二氧噻吩）聚苯乙烯磺酸盐（PEDOT:PSS）是锡铅混合钙钛矿（TLP）太阳能电池中最受欢迎的空穴传输材料，除了会加剧TLP的降解和寄生吸收外，还会导致TLP的成分偏析。然而，偏析现象现在是至关重要的，但以前很少讨论，其背后的机制几乎没有研究。在这项工作中，我们明确地揭示了在PEDOT:PSS中含有磺酸基的PSS倾向于在Pb之前配位Sn，并导致PEDOT:PSS表面的成核不均匀，进一步影响了TLP膜的生长。这导致锡富集严重，并在埋藏界面层频繁出现空洞；在TLP薄膜中Sn/Pb的分布是不均匀的。为了解决这个问题，我们设计了4-（10h -苯恶嗪-10-基）丁基)膦酸（PXZPA）来排除这种负面影响。对于带隙为1.30 eV的Cs0.1FA0.7MA0.2Sn0.3Pb0.7I3 TLP材料，缺陷密度从1.33 × 1016 cm-3明显下降到5.78 × 1015 cm-3，冠军器件转换效率从17.27%显著提高到22.43%。

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Unveiling Popular PEDOT:PSS-Derived Composition Segregation Effect in Tin–Lead Mixed Perovskite Solar Cells and Elimination

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Unveiling Popular PEDOT:PSS-Derived Composition Segregation Effect in Tin–Lead Mixed Perovskite Solar Cells and Elimination

As the most popular hole-transport material for promising tin–lead mixed perovskite (TLP) solar cells, poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) would cause the composition segregation of TLP, besides exacerbating degradation and parasitic absorption reported previously. However, the segregation phenomenon is now crucial but was rarely discussed previously, and the mechanism behind it was hardly investigated. In this work, we reveal unambiguously that PSS with a sulfonic acid group in PEDOT:PSS has the propensity to coordinate Sn prior to Pb and causes the uneven nucleation at the surface of PEDOT:PSS, further affecting the growth of the TLP film. This resulted in severe tin enrichment, and voids frequently occurred at the buried interfacial layer; herein, the Sn/Pb distribution was uneven through the TLP film. To address this concern, we designed 4-(10H-phenoxazin-10-yl)butyl)phosphonic acid (PXZPA) to exclude that negative effect. For the Cs_0.1FA_0.7MA_0.2Sn_0.3Pb_0.7I₃ TLP material with a bandgap of 1.30 eV, the defect density declined obviously from 1.33 × 10¹⁶ cm^–3 to 5.78 × 10¹⁵ cm^–3, and the champion device conversion efficiency surged remarkably from 17.27% to 22.43%.

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.