Enhancing Photostability of Sn-Pb Perovskite Solar Cells by an Alkylammonium Pseudo-Halogen Additive,Advanced Energy Materials

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Enhancing Photostability of Sn-Pb Perovskite Solar Cells by an Alkylammonium Pseudo-Halogen Additive
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-03-01 , DOI: 10.1002/aenm.202204115
Jiantao Wang ₁ , Md Aslam Uddin ₁ , Bo Chen ₁ , Xingjian Ying ₁ , Zhenyi Ni ₁ , Ying Zhou ₁ , Mingze Li ₁ , Mengru Wang ₁ , Zhenhua Yu ₁ , Jinsong Huang _{1,

2}

Affiliation

High-performance tin-lead perovskite solar cells (PSCs) are needed for all-perovskite-tandem solar cells. However, iodide related fast photodegradation severely limits the operational stability of Sn-Pb perovskites despite the demonstrated high efficiency and thermal stability. Herein, this work employs an alkylammonium pseudo-halogen additive to enhance the power conversion efficiency (PCE) and photostability of methylammonium (MA)-free, Sn-Pb PSCs. Density functional theory (DFT) calculations reveal that the pseudo-halogen tetrafluoroborate (BF₄⁻) has strong binding capacity with metal ions (Sn²⁺/Pb²⁺) in the Sn-Pb perovskite lattice, which lowers iodine vacancy formation. Upon combining BF₄⁻ with an octylammonium (OA⁺) cation, the PCE of the device with a built-in light-scattering layer is boosted to 23.7%, which represents a new record for Sn-Pb PSCs. The improved efficiency benefits from the suppressed defect density. Under continuous 1 sun illumination, the OABF₄ embodied PSCs show slower generation of interstitial iodides and iodine, which greatly improves the device photostability under open-circuit condition. Moreover, the device based on OABF₄ retains 88% of the initial PCE for 1000 h under the maximum-power-point tracking (MPPT) without cooling.

中文翻译：

通过烷基铵拟卤素添加剂增强 Sn-Pb 钙钛矿太阳能电池的光稳定性

全钙钛矿串联太阳能电池需要高性能锡铅钙钛矿太阳能电池 (PSC)。然而，尽管已证明具有高效率和热稳定性，但与碘化物相关的快速光降解严重限制了 Sn-Pb 钙钛矿的操作稳定性。在此，这项工作采用烷基铵假卤素添加剂来提高不含甲基铵 (MA) 的 Sn-Pb PSC 的功率转换效率 (PCE) 和光稳定性。密度泛函理论 (DFT) 计算表明，拟卤素四氟硼酸盐 (BF ₄^- ) 与Sn-Pb 钙钛矿晶格中的金属离子 (Sn ²⁺ /Pb ²⁺ )具有很强的结合能力，可降低碘空位的形成。合并 BF _4后^-使用辛基铵 (OA ⁺ ) 阳离子，具有内置光散射层的器件的 PCE 提高到 23.7%，这代表了 Sn-Pb PSC 的新记录。改进的效率得益于抑制的缺陷密度。在连续 1 个太阳光照下，OABF ₄嵌入的 PSC 显示间隙碘化物和碘的生成速度较慢，这大大提高了器件在开路条件下的光稳定性。此外，基于 OABF _{4 的}设备在无冷却的最大功率点跟踪 (MPPT) 下保持 88% 的初始 PCE 1000 小时。

更新日期：2023-03-01

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