Promoting perovskite crystal growth to achieve highly efficient and stable solar cells by introducing acetamide as an additive
Promoting perovskite crystal growth to achieve highly efficient and stable solar cells by introducing acetamide as an additive
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DOI：
10.1039/c8ta02121j
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发表时间：
2018-05
影响因子：
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通讯作者：
Haiying Zheng;Liangzheng Zhu;Linhua Hu;Shangfeng Yang;Shuanghong Chen;A. Alsaedi;T. Hayat;Y. Huang-Y.
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文献类型：
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作者：
Haiying Zheng;Liangzheng Zhu;Linhua Hu;Shangfeng Yang;Shuanghong Chen;A. Alsaedi;T. Hayat;Y. Huang-Y.
迄今为止，钙钛矿太阳能电池（PSC）已实现卓越的光伏性能，功率转换效率（PCE）超过22%。然而，同时具有高PCE和高稳定性的器件很少。在本研究中，我们使用非挥发性路易斯碱乙酰胺 (CH3CONH2) 作为添加剂，由 (FAPbI3)0.85(MAPbBr3)0.15 制成 PSC。与参考器件相比，含有 5 mg mL−1 CH3CONH2 的器件的 PCE 显着提高，达到 19.01%，并且滞后现象更小，因为其高质量薄膜具有更好的晶体结构、明显更大的晶粒尺寸和更大的厚度。此外，含有CH3CONH2的器件表现出更好的湿度和热稳定性。未密封的设备在相对湿度 (RH) 约 50% 和 80% 的情况下，可分别保持约 70% 和 50% 的起始 PCE，持续 1000 小时和 700 小时。同时，使用CH3CONH2的未密封装置在60℃和85℃下200小时和150小时分别可以保留约80%和60%的起始PCE。这些结果清楚地表明，使用CH3CONH2作为添加剂可以促进晶体生长并增大钙钛矿薄膜的晶粒尺寸，并且引入合适的添加剂可以实现PSC的PCE和稳定性的同时提高。
To date, perovskite solar cells (PSCs) have achieved superior photovoltaic performance with a high power conversion efficiency (PCE) of over 22%. However, there are very few devices which have a high PCE and high stability simultaneously. In this study, we fabricated PSCs made from (FAPbI3)0.85(MAPbBr3)0.15 using the non-volatile Lewis base acetamide (CH3CONH2) as an additive. Compared to a reference device, the device containing 5 mg mL−1 CH3CONH2 displayed a markedly improved PCE of 19.01% and less hysteresis, due to its high-quality film with a better crystal structure, evidently larger grain size and greater thickness. In addition, the device with CH3CONH2 exhibited better humidity and heat stability. The unsealed device could maintain about 70% and 50% of its starting PCE under around 50% and 80% relative humidity (RH) for 1000 h and 700 h, respectively. Meanwhile, the unsealed device with CH3CONH2 could retain about 80% and 60% of its starting PCE at 60 °C and 85 °C for 200 h and 150 h, respectively. These results clearly show that using CH3CONH2 as an additive can promote crystal growth and enhance the grain size of perovskite thin films and introducing a suitable additive can realize the simultaneous improvement of the PCE and stability of PSCs.