Salah Maroua Ben Haj, Mercier Nicolas, Dabos-Seignon Sylvie, Botta Chiara
MOLTECH-ANJOU, UMR-CNRS 6200, Université d'Angers, 2 Bd Lavoisier, 49045, Angers, France.
Istituto di Scienze e Tecnologie Chimiche "G. Natta" (SCITEC), CNR, Via Corti 12, 20133, Milano, Italy.
Angew Chem Int Ed Engl. 2022 Aug 26;61(35):e202206665. doi: 10.1002/anie.202206665. Epub 2022 Jul 21.
Lead halide 2D hybrid perovskites (HP) have emerged as promising materials for photovoltaic and lighting applications. Solvent-free preparations offer greener route, but require congruent melting of halide perovskite for thin films, which has been demonstrated only for monolayered HP (n=1 of the (A) (MA) Pb I series) at the quite high temperature T (T ) of 171 °C. Here, we report on the solvent-free preparation (n=2, 4), thermal behaviour and melt-processed thin films of a series of HP (GABA) (MA) Pb I (n=1, 2, 4; GABA : 4-ammoniumbutyric acid cation). The n=1 and n=2 HP have an exceptional low congruent T of 126 °C and 136 °C, respectively, and, for n=1, a very good stability in the molten state. The liquid-solid reaction of molten (GABA) PbI or (GABA) (MA)Pb I with MAPbI in 1/1 (T=130 °C) or 1/2 (T=135 °C) ratio leads to pure phases of the n=2 HP and (GABA) (MA) Pb I (n=4, T =185 °C), respectively. Melt-processed thin films of n=1, n=2 and n=4 HP have also been prepared.
卤化铅二维混合钙钛矿（HP）已成为用于光伏和照明应用的有前途的材料。无溶剂制备提供了更绿色的途径，但需要卤化钙钛矿在薄膜中完全熔化，这仅在相当高的温度T（171°C）下针对单层HP（（A）（MA）PbI系列中的n = 1）得到了证明。在此，我们报告了一系列HP（GABA）（MA）PbI（n = 1、2、4；GABA：4-铵基丁酸阳离子）的无溶剂制备（n = 2、4）、热行为和熔体加工薄膜。n = 1和n = 2的HP分别具有126°C和136°C的极低完全熔化温度，并且对于n = 1，在熔融状态下具有非常好的稳定性。熔融的（GABA）PbI或（GABA）（MA）PbI与MAPbI以1/1（T = 130°C）或1/2（T = 135°C）的比例进行液-固反应，分别得到n = 2的HP和（GABA）（MA）PbI（n = 4，T = 185°C）的纯相。还制备了n = 1、n = 2和n = 4的HP的熔体加工薄膜。
