Zhang Lifu, Jiang Jie, Hu Yang, Lu Zonghuan, Wen Xixing, Pendse Saloni, Jia Ru, Wang Gwo-Ching, Lu Toh-Ming, Shi Jian
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
J Am Chem Soc. 2022 Sep 28;144(38):17588-17596. doi: 10.1021/jacs.2c07069. Epub 2022 Sep 13.
2D Ruddlesden-Popper (RP) halide perovskites with natural multiple quantum well structures are an ideal platform to integrate into vertical heterostructures, which may introduce plentiful intriguing optoelectronic properties that are not accessible in a single bulk crystal. Here, we report liquid-phase van der Waals epitaxy of a 2D RP hybrid perovskite (4,4-DFPD)PbI (4,4-DFPD is 4,4-difluoropiperidinium) on muscovite mica and fabricate a series of perovskite-perovskite vertical heterostructures by integrating it with a second 2D RP perovskite R-NPB [NPB = 1-(1-naphthyl)ethylammonium lead bromide] sheets. The grown (4,4-DFPD)PbI nanobelt array can be multiple layers to unit-cell thin and are crystallographically aligned on the mica substrate. An interlayer photo emission in this R-NPB/(4,4-DFPD)PbI heterostructure with a lifetime of about 25 ns at 120 K has been revealed. Our demonstration of epitaxial (4,4-DFPD)PbI array grown on mica liquid-phase van der Waals epitaxy provides a paradigm to prepare orderly distributed 2D RP hybrid perovskites for further integration into multiple heterostructures. The discovery of a new interlayer emission in the R-NPB/(4,4-DFPD)PbI heterostructure enriches the basic understanding of interlayer charge transition in halide perovskite systems.
具有天然多量子阱结构的二维鲁德尔斯登-波珀（RP）卤化物钙钛矿是集成到垂直异质结构中的理想平台，这可能会引入许多在单一块状晶体中无法获得的有趣光电特性。在此，我们报道了在白云母上通过液相范德华外延生长二维RP杂化钙钛矿（4,4-二氟哌啶鎓）PbI（4,4-二氟哌啶鎓即4,4-difluoropiperidinium），并通过将其与第二种二维RP钙钛矿R-NPB [NPB = 1-(1-萘基)乙铵溴化铅] 片层集成，制备了一系列钙钛矿-钙钛矿垂直异质结构。生长的（4,4-二氟哌啶鎓）PbI纳米带阵列可以从多层到单胞厚度，并且在云母衬底上晶体学取向排列。已揭示出在该R-NPB/（4,4-二氟哌啶鎓）PbI异质结构中，在120 K下具有约25 ns寿命的层间光发射。我们在云母上外延生长（4,4-二氟哌啶鎓）PbI阵列的演示——液相范德华外延为制备有序分布的二维RP杂化钙钛矿以进一步集成到多个异质结构中提供了一个范例。在R-NPB/（4,4-二氟哌啶鎓）PbI异质结构中发现新的层间发射，丰富了对卤化物钙钛矿体系中层间电荷转移的基本认识。
