Vertical Orientated Dion–Jacobson Quasi‐2D Perovskite Film with Improved Photovoltaic Performance and Stability,Small Methods

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Vertical Orientated Dion–Jacobson Quasi‐2D Perovskite Film with Improved Photovoltaic Performance and Stability
Small Methods ( IF 10.7 ) Pub Date : 2019-12-23 , DOI: 10.1002/smtd.201900831
Fengzhu Li _{1,

2} , Jie Zhang ₂ , SaeByeok Jo ₃ , Minchao Qin ₄ , Zhen Li ₂ , Tiantian Liu ₂ , Xinhui Lu ₄ , Zonglong Zhu _{1,

2} , Alex K.‐Y. Jen _{1,

2,

3}

Affiliation

Dion–Jacobson (DJ) phase 2D layered perovskites with diammonium organic cations demonstrate improved stability over 3D perovskites under thermal/photo/moisture stresses. However, the power conversion efficiency (PCE) of DJ phase perovskite solar cells (PVSCs) is often limited by the poor charge transport across the perovskite layers due to the crystal growth direction that tends to be parallel to the substrate. Here, a simple and effective method is demonstrated by employing a NH₄SCN additive to facilitate the orientation of perovskite crystal growth to be perpendicular to the substrate. Also, the layer number distribution can be narrowed to around n = 3 and n = 4 with NH₄SCN addition. The device derived from the quasi‐2D DJ (BDA)(MA)₄Pb₅I₁₆ perovskite film processed with NH₄SCN shows a PCE of 14.53%, which is among the highest values reported for 2D PVSCs prepared at room temperature. Moreover, the device retains 85% of its initial PCE after 900 h storage in ambient conditions with a humidity level of 50 ± 5%. These results demonstrate that this attractive approach will enable highly efficient and stable PVSCs to be made for renewable energy applications.

中文翻译：

垂直定向的Dion–Jacobson准2D钙钛矿薄膜，具有改善的光伏性能和稳定性

具有二铵有机阳离子的Dion–Jacobson（DJ）相2D层状钙钛矿在热/光/湿应力下的稳定性优于3D钙钛矿。但是，DJ相钙钛矿太阳能电池（PVSC）的功率转换效率（PCE）通常受到由于晶体生长方向趋于平行于基板的差的钙钛矿层间电荷传输能力的限制。在此，通过使用NH ₄ SCN添加剂来促进钙钛矿晶体生长的方向垂直于基板，证明了一种简单有效的方法。此外，使用NH _4时，层数分布可以缩小到n = 3和n = _4左右SCN添加。该器件源自用NH ₄ SCN处理的准2D DJ（BDA）（MA）₄ Pb ₅ I ₁₆钙钛矿薄膜，其PCE为14.53％，这是在室温下制备的2D PVSC的最高记录值之一。此外，该器件在湿度为50±5％的环境条件下保存900小时后，仍保留其初始PCE的85％。这些结果表明，这种有吸引力的方法将使高效，稳定的PVSC能够用于可再生能源应用。

更新日期：2019-12-23

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