Reducing Defects of All-Inorganic γ-CsPbI2Br Thin Films by Ethylammonium Bromide Additives for Efficient Perovskite Solar Cells,ACS Applied Materials & Interfaces

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Reducing Defects of All-Inorganic γ-CsPbI2Br Thin Films by Ethylammonium Bromide Additives for Efficient Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-05-27 , DOI: 10.1021/acsami.2c05758
Jyoti V Patil _{1,

2} , Sawanta S Mali ₂ , Chang Kook Hong _{1,

2}

Affiliation

Obtaining good-quality perovskite thin films is a fundamental facet that contributes to efficient inorganic perovskite solar cells. Herein, we successfully deposited ethylammonium bromide (EABr) additive-assisted high quality γ-CsPbI₂Br perovskite films under ambient conditions. Detailed morphological, structural, optical, charge transport, photovoltaic performance, and stability properties have been studied. It is observed that the EABr additive helps to retard the crystal growth of perovskite films to produce a highly crystalline perovskite film with microsized grains (>1 μm) and with reduced grain boundaries. The fabricated devices based on an optimum amount of EABr (4 mg mL^–1) exhibited the highest 14.47 % power conversion efficiency. Moreover, the EABr-4 mg mL^–1-assisted γ-CsPbI₂Br-based devices achieved a high thermal long-term stability and maintained ∼75% of their initial efficiency over 180 h at 85 °C thermal stress under ambient conditions (relative humidity: ∼35%) without encapsulation. This additive-assisted method suggests a new pathway to achieve high-quality perovskite films with a stabilized photoactive black phase and efficient devices.

中文翻译：

用于高效钙钛矿太阳能电池的溴化乙基铵添加剂减少全无机 γ-CsPbI2Br 薄膜的缺陷

获得高质量的钙钛矿薄膜是有助于高效无机钙钛矿太阳能电池的基本方面。在此，我们成功地在环境条件下沉积了乙基溴化铵 (EABr) 添加剂辅助的高质量γ- CsPbI _{2 Br 钙钛矿薄膜。}已经研究了详细的形态、结构、光学、电荷传输、光伏性能和稳定性特性。据观察，EABr 添加剂有助于延缓钙钛矿薄膜的晶体生长，从而生产出具有微尺寸晶粒 (>1 μm) 和减少晶界的高结晶钙钛矿薄膜。基于最佳量的 EABr (4 mg mL ^–1) 表现出最高的 14.47 % 功率转换效率。此外，EABr-4 mg mL ^–1辅助的γ- CsPbI ₂ Br 基器件实现了高热长期稳定性，并在环境条件下 85 °C 热应力下在 180 小时内保持了约 75% 的初始效率（相对湿度：~35%）没有封装。这种添加剂辅助方法为获得具有稳定光活性黑相和高效器件的高质量钙钛矿薄膜提供了一条新途径。

更新日期：2022-05-27

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