Li Congping, Yin Jun, Chen Ruihao, Lv Xudong, Feng Xiaoxia, Wu Yiying, Cao Jing
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , P.R. China.
Pen-Tung Sah Institute of Micro-Nano Science and Technology , Xiamen University , Xiamen 361005 , P.R. China.
J Am Chem Soc. 2019 Apr 17;141(15):6345-6351. doi: 10.1021/jacs.9b01305. Epub 2019 Mar 25.
Efficient control of crystallization and defects of perovskite films are the key factors toward the performance and stability of perovskite solar cells (PSCs), especially for the preparation of large-area PSCs devices. Herein, we directly embedded surfactant-like monoammonium zinc porphyrin (ZnP) compound into the methylammonium (MA) lead iodide perovskite film to blade-coat large-area uniform perovskite films as large as 16 cm. Efficiency as high as 18.3% for blade-coating large-area (1.96 cm) PSCs with ZnP was unprecedentedly achieved, while the best efficiency of fabricated small-area (0.1 cm) device was up to 20.5%. The detailed analyses demonstrated the functions of ZnP in crystallization control and defects passivation of perovskite surfaces and grain boundaries. As a consequence, the ZnP-encapsulated devices retained over 90% of its initial efficiency after 1000 h with a humidity of about 45% at 85 °C. This research presents a facile way to achieve the synergistic effect of large-area coating, morphology tailoring, and defect suppression based on the molecular encapsulation strategy for perovskite films, further improving the photovoltaic performance and stability of PSCs.
有效控制钙钛矿薄膜的结晶和缺陷是影响钙钛矿太阳能电池（PSC）性能和稳定性的关键因素，对于大面积PSC器件的制备尤为重要。在此，我们将类表面活性剂单铵锌卟啉（ZnP）化合物直接嵌入甲基铵（MA）碘化铅钙钛矿薄膜中，以刮涂法制备出面积达16 cm的大面积均匀钙钛矿薄膜。采用ZnP刮涂大面积（1.96 cm）PSC的效率前所未及地高达18.3%，而制备的小面积（0.1 cm）器件的最佳效率高达20.5%。详细分析表明了ZnP在钙钛矿表面和晶界的结晶控制和缺陷钝化方面的作用。因此，在85°C、湿度约45%的条件下，经1000小时后，ZnP封装的器件仍保留其初始效率的90%以上。本研究基于钙钛矿薄膜的分子封装策略，提出了一种实现大面积涂层、形貌调控和缺陷抑制协同效应的简便方法，进一步提高了PSC的光伏性能和稳定性。
