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Chin. Phys. B, 2021, Vol. 30(8): 088803    DOI: 10.1088/1674-1056/abfbcb
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Stabilization of formamidinium lead iodide perovskite precursor solution for blade-coating efficient carbon electrode perovskite solar cells

Yu Zhan(占宇), Weijie Chen(陈炜杰), Fu Yang(杨甫), and Yaowen Li(李耀文)
Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
Abstract  Formamidinium lead triiodide (FAPbI3) is a research hotspot in perovskite photovoltaics due to its broad light absorption and proper thermal stability. However, quite a few researches focused on the stability of the FAPbI3 perovskite precursor solutions. Besides, the most efficient FAPbI3 layers are prepared by the spin-coating method, which is limited to the size of the device. Herein, the stability of FAPbI3 perovskite solution with methylammonium chloride (MACl) or cesium chloride (CsCl) additive is studied for preparing perovskite film through an upscalable blade-coating method. Each additive works well for achieving a high-quality FAPbI3 film, resulting in efficient carbon electrode perovskite solar cells (pero-SCs) in the ambient condition. However, the perovskite solution with MACl additive shows poor aging stability that no α-FAPbI3 phase is observed when the solution is aged over one week. While the perovskite solution with CsCl additive shows promising aging stability that it still forms high-quality pure α-FAPbI3 perovskite film even the solution is aged over one month. During the solution aging process, the MACl could be decomposed into methylamine which will form some unfavored intermediated phase inducing δ-phase FAPbI3. Whereas, replacing MACl with CsCl could effectively solve this issue. Our founding shows that there is a great need to develop a non-MACl FAPbI3 perovskite precursor solution for cost-effective preparation of pero-SCs.
Keywords:  perovskite precursor solution      formamidinium lead iodide      blade-coating      carbon electrode  
Received:  31 March 2021      Revised:  24 April 2021      Accepted manuscript online:  27 April 2021
PACS:  88.40.H- (Solar cells (photovoltaics))  
  88.40.hj (Efficiency and performance of solar cells)  
  84.60.Jt (Photoelectric conversion)  
Fund: Project supported by the Key Research and Development Program of China (Grant No. 2020YFB1506400), the National Natural Science Foundation of China (Grant Nos. 51922074, 51673138, 51820105003, and 22075194), the Tang Scholar, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Collaborative Innovation Center of Suzhou Nano Science and Technology.
Corresponding Authors:  Fu Yang, Yaowen Li     E-mail:  fuyang@suda.edu.cn;ywli@suda.edu.cn

Cite this article: 

Yu Zhan(占宇), Weijie Chen(陈炜杰), Fu Yang(杨甫), and Yaowen Li(李耀文) Stabilization of formamidinium lead iodide perovskite precursor solution for blade-coating efficient carbon electrode perovskite solar cells 2021 Chin. Phys. B 30 088803

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