Nucleation and Growth Control of HC(NH2)2PbI3 for Planar Perovskite Solar Cell

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• 作者：Jincheol Kim ; Jae S. Yun ; Xiaoming Wen ; Arman Mahboubi Soufiani ; Cho Fai Jonathan Lau ; Benjamin Wilkinson ; Jan Seidel ; Martin A. Green ; Shujuan Huang ; Anita W. Y. Ho-Baillie
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：May 26, 2016
• 年：2016
• 卷：120
• 期：20
• 页码：11262-11267
• 全文大小：409K
• 年卷期：0
• ISSN：1932-7455

文摘

HC(NH₂)₂PbI₃ perovskite solar cells have emerged as a promising alternative to CH₃NH₃PbI₃ perovskite solar cells due to their better thermal stability and lower bandgap. In this work, we have demonstrated a reliable fabrication technique for HC(NH₂)₂PbI₃ planar perovskite solar cells by controlling nucleation and crystallization processes of the perovskite layer through a combination of gas-assisted spin coating and the addition of HI additive in the perovskite precursor. A narrow distribution of power conversion efficiencies (PCEs) can be achieved with an average of 13% with negligible hysteresis when measured at a scanning rate of 0.1 V/s. The best performance device has a PCE of 16.0%. It is shown that by using optimized conditions we can consistently form dense, uniform, pinhole-free good crystalline, lead-iodide-impurities-free HC(NH₂)₂PbI₃ film that has been comprehensively characterized by scanning electron microscopy, X-ray diffraction, Kelvin probe force microscopy, photoluminescence, and electroluminescence in this work.