Mandal Tarak Nath, Heo Jin Hyuck, Im Sang Hyuk, Kim Woo-Sik
Functional Crystallization Center, Department of Chemical Engineering (Integrated Engineering), Kyung Hee University, Yongin, Gyeonggi-do, 17104, Republic of Korea.
Department of Chemical and Biological Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul, 02841, Republic of Korea.
Small. 2023 Dec;19(52):e2305246. doi: 10.1002/smll.202305246. Epub 2023 Aug 27.
Pure δ-formamidinium lead triiodide (δ-FAPbI ) single crystal for highly efficient perovskite solar cell (PCS) with long-term stability is prepared by a new method consisting of liquid phase reaction of FAI and PbI in N,N-dimethyl formamide and antisolvent crystallization using acetonitrile. In this method, the incorporation of any impurity into the crystal is excluded by the molecular recognition of the crystal growth site. This pure crystal is used to fabricate α-FAPbI inverted PSCs which showed excellent power conversion efficiency (PCE) due to much-reduced trap-states. The champion device exhibited a high PCE of 23.48% under the 1-Sun condition. Surface-treated devices with 3-(aminomethyl)pyridine showed a significantly improved PCE of 25.07%. In addition, the unencapsulated device maintained 97.22% of its initial efficiency under continuous 1-Sun illumination for 1,000 h at 85 °C in an N atmosphere ensuring long-term thermal and photo stabilities of PSCs, whereas the control device kept only 89.93%.
通过一种新方法制备了用于高效且具有长期稳定性的钙钛矿太阳能电池（PSC）的纯δ-甲脒铅三碘化物（δ-FAPbI₃）单晶，该方法包括在N，N-二甲基甲酰胺中使FAI和PbI进行液相反应，并使用乙腈进行反溶剂结晶。在这种方法中，通过晶体生长位点的分子识别排除了任何杂质掺入晶体。这种纯晶体用于制造α-FAPbI倒置PSC，由于陷阱态大大减少，其显示出优异的功率转换效率（PCE）。在1个太阳光照条件下，最佳器件表现出23.48%的高PCE。用3-（氨甲基）吡啶进行表面处理的器件显示PCE显著提高至25.07%。此外，在N₂气氛中于85℃连续1个太阳光照1000小时的条件下，未封装的器件保持其初始效率的97.22%，确保了PSC的长期热稳定性和光稳定性，而对照器件仅保持89.93%。
