Inner Encapsulating Approach for Moisture-Stable Perovskite Solar Cells,Solar RRL

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Inner Encapsulating Approach for Moisture-Stable Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2021-07-13 , DOI: 10.1002/solr.202100351
Yong Ryun Kim ₁ , Juae Kim ₂ , Heejoo Kim ₃ , Chang-Jae Yoon ₁ , Jun-Tae Yun ₂ , Ju-Hyeon Kim ₄ , Ayeong Gu ₄ , Hongsuk Suh ₂ , Kwanghee Lee _{1,

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Affiliation

The degradation of the perovskite layer in atmospheric air is a critical bottleneck for the commercialization of perovskite solar cells (PSCs). As the moisture and oxygen in air penetrate the charge transport layer/top metal electrode interface, both adjacent layers and perovskite layers decompose in the PSCs. Herein, moisture-stable inverted PSCs (I-PSCs) based on methylammonium lead triiodide (MAPbI₃) by introducing amine-functionalized small molecules as metal adhesive layers (MALs) between the electron transport layer (ETL) and metal electrode (here, Cu) are demonstrated. A strong coordination bond of CuN forms at the Cu/MAL interface, leading to the layer–layer growth mode for the dense formation of Cu electrodes with a strong adhesion to the ETL. Thus, this modified electrode prevents the ingress of moisture into the I-PSCs, resulting in outstanding moisture stability; the efficiency of I-PSCs retains 90% of the initial efficiency after 200 days of exposure to atmospheric air (25 °C, relative humidity [RH] ≈20–40%). Under harsher conditions (e.g., 25 °C/RH65%, 25 °C/RH85% and immersion in water) for a considerable time period, the modified I-PSCs manifest relatively no degradation compared with the pristine I-PSCs. It is believed that this breakthrough provides a significant impact on improving the stability of I-PSCs.

中文翻译：

耐湿钙钛矿太阳能电池的内部封装方法

大气中钙钛矿层的降解是钙钛矿太阳能电池（PSC）商业化的关键瓶颈。随着空气中的水分和氧气渗透电荷传输层/顶部金属电极界面，相邻层和钙钛矿层在 PSC 中分解。这里，湿度稳定反转的PSC（I-的PSCs）的基础上甲基铵铅三碘化物（MAPbI ₃通过引入胺官能化的小分子作为电子传输层（ETL）和金属电极（在此，Cu的金属粘合层（MALS）） ) 进行演示。Cu  的强配位键N 在 Cu/MAL 界面形成，导致致密形成 Cu 电极的层-层生长模式，与 ETL 有很强的附着力。因此，这种修饰电极可防止水分进入 I-PSC，从而具有出色的水分稳定性；在暴露于大气空气（25°C，相对湿度 [RH] ≈20–40%）200 天后，I-PSC 的效率仍保持初始效率的 90%。在更恶劣的条件下（例如，25°C/RH65%、25°C/RH85% 和浸入水中）相当长的一段时间，与原始 I-PSC 相比，改性 I-PSC 表现出相对没有降解。相信这一突破对提高I-PSCs的稳定性产生了重大影响。

更新日期：2021-09-09

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