Sahayaraj Sylvester, Starowicz Zbigniew, Ziółek Marcin, Socha Robert, Major Łukasz, Góral Anna, Gawlińska-Nęcek Katarzyna, Palewicz Marcin, Sikora Andrzej, Piasecki Tomasz, Gotszalk Teodor, Lipiński Marek
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Krakow, Poland.
CBRTP SA Research and Development Center of Technology for Industry, Ludwika Waryńskiego 3A, 00-645 Warszawa, Poland.
Materials (Basel). 2023 Jul 30;16(15):5352. doi: 10.3390/ma16155352.
Formamidinium lead iodide (FAPbI)-based perovskite solar cells have gained immense popularity over the last few years within the perovskite research community due to their incredible opto-electronic properties and the record power conversion efficiencies (PCEs) achieved by the solar cells. However, FAPbI is vulnerable to phase transitions even at room temperature, which cause structural instability and eventual device failure during operation. We performed post-treatment of the FAPbI surface with octyl ammonium iodide (OAI) in order to stabilize the active phase and preserve the crystal structure of FAPbI. The formation of a 2D perovskite at the interface depends on the stoichiometry of the precursor. By optimizing the precursor stoichiometry and the concentration of OAI, we observe a synergistic effect, which results in improved power conversion efficiencies, reaching the best values of 22% on a glass substrate. Using physical and detailed optical analysis, we verify the presence of the 2D layer on the top of the 3D surface of the perovskite film.
在过去几年里，基于甲脒碘化铅（FAPbI）的钙钛矿太阳能电池因其令人难以置信的光电特性以及该太阳能电池所实现的创纪录功率转换效率（PCE），在钙钛矿研究领域获得了极大的关注。然而，即使在室温下，FAPbI也容易发生相变，这会导致结构不稳定，并最终在运行过程中使器件失效。我们用碘化辛铵（OAI）对FAPbI表面进行了后处理，以稳定活性相并保持FAPbI的晶体结构。界面处二维钙钛矿的形成取决于前体的化学计量比。通过优化前体化学计量比和OAI浓度，我们观察到了一种协同效应，这使得功率转换效率得到提高，在玻璃基板上达到了22%的最佳值。通过物理和详细的光学分析，我们验证了钙钛矿薄膜三维表面顶部二维层的存在。
