In Situ Formation of High-pKa Cations for Perovskite Solar Cells,ACS Energy Letters

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In Situ Formation of High-pKa Cations for Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-08-23 , DOI: 10.1021/acsenergylett.4c01626
Pengfei Wu _{1,

2,

3} , Jin Hyuck Heo ₄ , Yating Shi _{1,

2} , Shirong Wang _{1,

2} , Minghui Li ₅ , Chuanxiao Xiao _{5,

6} , Xianggao Li _{1,

2} , Fei Zhang _{1,

2}

Affiliation

Surface passivation is one of the most promising strategies for improving the illumination stability at high temperatures for perovskite solar cells. However, commonly used surface agents should be presynthesized and were usually located at the perovskite surface or interfaces, making it challenging to suppress bulk defects simultaneously. Here, we present an approach for the in situ formation of high-pK_a cations ([N(Z)]-N-(Aminomethylene)guanidinium) to eliminate charge defects in bulk and interfacial sites simultaneously. Consequently, the performance is enhanced for both n-i-p and p-i-n structures, with the highest reaching ∼25.4% and 20.1% (64 cm² aperture area). Additionally, the treatment can be applied to extensive perovskite compositions, including triple cations, double cations, and single cation-based perovskites. The devices retain 94% of their initial efficiency after 2000 h continuous light illumination under the maximum power point tracking (ISOS-L-1), representing the best photostability among n-i-p structured devices(>25%)reported to date.

中文翻译：

钙钛矿太阳能电池高 pKa 阳离子的原位形成

表面钝化是提高钙钛矿太阳能电池高温照明稳定性的最有前途的策略之一。然而，常用的表面剂应该预先合成，并且通常位于钙钛矿表面或界面，这使得同时抑制体缺陷具有挑战性。在这里，我们提出了一种原位形成高 p Ka_阳离子（[N(Z)]-N-(氨基亚甲基)胍）的方法，以同时消除体相和界面位点的电荷缺陷。因此，nip 和 pin 结构的性能均得到增强，最高达到~25.4% 和 20.1%（64 cm ²孔径面积）。此外，该处理可应用于广泛的钙钛矿组合物，包括三阳离子、双阳离子和单阳离子钙钛矿。在最大功率点跟踪 (ISOS-L-1) 下连续光照 2000 小时后，这些器件仍保留了 94% 的初始效率，代表了迄今为止报道的压区结构器件中最佳的光稳定性 (>25%)。

更新日期：2024-08-23

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