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Controllable Synthesis of Two-Dimensional Ruddlesden–Popper-Type Perovskite Heterostructures

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journal contribution
posted on 11.12.2017, 00:00 by Jun Wang, Junze Li, Qinghai Tan, Lei Li, Jianbing Zhang, Jianfeng Zang, Pingheng Tan, Jun Zhang, Dehui Li
Two-dimensional Ruddlesden–Popper type perovskites (2D perovskites) have recently attracted increasing attention. It is expected that 2D perovskite-based heterostructures can significantly improve the efficiency of the optoelectronic devices and extend the material functionalities; however, rational synthesis of such heterostructures has not been realized to date. We report on a general low-temperature synthetic strategy for the synthesis of 2D perovskite-based lateral and vertical (n-CH3(CH2)3NH3)2PbI4/(n-CH3(CH2)3NH3)2(CH3NH3)­Pb2I7 heterostructures for the first time. A combination of solution synthesis and gas–solid phase intercalation approach allows us to efficiently synthesize both lateral and vertical heterostructures with great flexibility. X-ray diffraction, photoluminescence, and photoluminescence excitation mapping and electrical transport measurement studies reveal the successful synthesis of lateral and vertical heterostructures with precisely spatial-modulation control and distinguishable interfaces. Our studies not only provide an efficient synthetic strategy with great flexibility, enabling us to create 2D perovskite-based heterostructures, but also offer a platform to investigate the physical processes in those heterostructures.