N-Type Conductive Small Molecule Assisted 23.5% Efficient Inverted Perovskite Solar Cells,Advanced Energy Materials

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N-Type Conductive Small Molecule Assisted 23.5% Efficient Inverted Perovskite Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-07-27 , DOI: 10.1002/aenm.202201435
Qi Cao ₁ , Yuke Li ₂ , Yixin Zhang ₁ , Junsong Zhao ₁ , Tong Wang ₁ , Bowen Yang _{3,

4} , Xingyu Pu ₁ , Jiabao Yang ₁ , Hui Chen ₁ , Xingyuan Chen ₁ , Xiaoqiang Li ₁ , Shahnaz Ghasemi ₅ , Hadi Salari ₆ , Anders Hagfeldt _{3,

4} , Xuanhua Li ₁

Affiliation

Because of the compatibility with tandem devices and the ability to be manufactured at low temperatures, inverted perovskite solar cells have generated far-ranging interest for potential commercial applications. However, their efficiency remains inadequate owing to various traps in the perovskite film and the restricted hole blocking ability of the electron transport layer. Thus, in this work, a wide-bandgap n-type semiconductor, 4,6-bis(3,5-di(pyridin-4-yl)phenyl)-2-phenylpyrimidine (B4PyPPM), to modify a perovskite film via an anti-solvent method is introduced. The nitrogen sites of pyrimidine and pyridine rings in B4PyPPM exhibit strong interactions with the undercoordinated lead ions in the perovskite material. These interactions can reduce the trap state densities and inhibit nonradiative recombination of the perovskite bulk. Moreover, B4PyPPM can partially aggregate on the perovskite surface, leading to an improvement in the hole-blocking ability at its interface. This modification can also increase the built-in potential and upshift the Fermi level of the modified perovskite film, promoting electron extraction to the electron transport layer. The champion device achieves a high efficiency of 23.51%. Meantime, the sealed device retains ≈80% of its initial performance under a maximum power point tracking for nearly 2400 h, demonstrating an excellent operational stability.

中文翻译：

N型导电小分子辅助23.5%效率倒置钙钛矿太阳能电池

由于与串联器件的兼容性和在低温下制造的能力，倒置钙钛矿太阳能电池对潜在的商业应用产生了广泛的兴趣。然而，由于钙钛矿薄膜中的各种陷阱和电子传输层的空穴阻挡能力受限，它们的效率仍然不足。因此，在这项工作中，宽带隙 n 型半导体 4,6-bis(3,5-di(pyridin-4-yl)phenyl)-2-phenylpyrimidine (B4PyPPM) 通过介绍了反溶剂法。B4PyPPM 中嘧啶和吡啶环的氮位点与钙钛矿材料中未配位的铅离子表现出强烈的相互作用。这些相互作用可以降低陷阱态密度并抑制钙钛矿块体的非辐射复合。而且，B4PyPPM 可以部分聚集在钙钛矿表面，从而提高其界面处的空穴阻挡能力。这种改性还可以增加内建电位，提高改性钙钛矿薄膜的费米能级，促进电子向电子传输层的提取。冠军器件实现了23.51%的高效率。同时，密封装置在最大功率点跟踪下保持约 80% 的初始性能近 2400 小时，表现出出色的运行稳定性。冠军器件实现了23.51%的高效率。同时，密封装置在最大功率点跟踪下保持约 80% 的初始性能近 2400 小时，表现出出色的运行稳定性。冠军器件实现了23.51%的高效率。同时，密封装置在最大功率点跟踪下保持约 80% 的初始性能近 2400 小时，表现出出色的运行稳定性。

更新日期：2022-07-27

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