Amplifying Hole Extraction Characteristics of PEDOT:PSS via Post-treatment with Aromatic Diammonium Acetates for Tin Perovskite Solar Cells
Amplifying Hole Extraction Characteristics of PEDOT:PSS via Post-treatment with Aromatic Diammonium Acetates for Tin Perovskite Solar Cells
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DOI：
10.1021/acsenergylett.3c00583
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发表时间：
2023-07
影响因子：
22
通讯作者：
Donghoon Song;Hao Li;Yuanze Xu;Qiuming Yu
中科院分区：
文献类型：
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作者：
Donghoon Song;Hao Li;Yuanze Xu;Qiuming Yu
我们修改的PEDOT：PSS空穴传输层（HTL），通常采用高性能锡钙钛矿太阳能电池（TPSC），通过后处理其表面使用芳香族二铵乙酸盐溶解在一个高度挥发性的，但相互作用的溶剂。该溶剂部分地蚀刻过量的绝缘PSS，同时使得盐能够紧密锚定到PEDOT：PSS HTL。该盐不仅改善了PEDOT：PSS/钙钛矿界面，而且改善了锡钙钛矿薄膜的顶表面，从而减少了界面缺陷，提高了内建电位，并抑制了钙钛矿针孔缺陷。此外，盐将PEDOT结构从苯并型转变为醌型，并减少过量的空穴载流子以促进空穴提取。因此，TPSC在标准1个太阳光照射下达到12.1%的高效率，并且在N2气氛下无封装的情况下具有令人印象深刻的稳定性2800 h。我们开发了一种简单但有效的方法来修改PEDOT：PSS以获得更广泛的应用。
We modify the PEDOT:PSS hole transport layer (HTL), commonly adopted for high-performance tin perovskite solar cells (TPSCs), via post-treatment of its surface using aromatic diammonium acetate salts dissolved in a highly volatile but interactive solvent. The solvent partly etches excessive insulating PSS while enabling tight anchoring of the salts to the PEDOT:PSS HTL. The salts improve not only the PEDOT:PSS/perovskite interface but also the top surface of tin perovskite thin films, leading to reduced interface defects, larger built-in potentials, and suppressed perovskite pinhole defects. In addition, the salts transform the PEDOT structure from benzoid to quinoid and depopulate excessive hole charge carriers to promote hole extraction. Consequently, TPSCs attain a high efficiency of 12.1% under standard 1 sun light illumination and impressive stability without encapsulation for ∼2800 h under an N2atmosphere. We developed a straightforward but impactful method to modify PEDOT:PSS for broader applications.