• 文献标题:   Metal Halide Perovskite Heterostructures: Blocking Anion Diffusion with Single-Layer Graphene
  • 文献类型:   Article, Early Access
  • 作  者:   HAUTZINGER MP, RAULERSON EK, HARVEY SP, LIU T, DUKE D, QIN XX, SCHEIDT RA, WIELICZKA BM, PHILLIPS AJ, GRAHAM KR, BLUM V, LUTHER JM, BEARD MC, BLACKBURN JL
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
  • ISSN:   0002-7863 EI 1520-5126
  • 通讯作者地址:  
  • 被引频次:   4
  • DOI:   10.1021/jacs.2c12441 EA JAN 2023
  • 出版年:   2023

▎ 摘  要

The development of metal halide perovskite/perovskite heterostructures is hindered by rapid interfacial halide diffusion leading to mixed alloys rather than sharp interfaces. To circumvent this outcome, we developed an ion-blocking layer consisting of single-layer graphene (SLG) deposited between the metal halide perovskite layers and demonstrated that it effectively blocks anion diffusion in a CsPbBr3/SLG/CsPbI3 heterostructure. Spatially resolved elemental analysis and spectroscopic measurements demonstrate the halides do not diffuse across the interface, whereas control samples without the SLG show rapid homogenization of the halides and loss of the sharp interface. Ultraviolet photoelectron spectroscopy, DFT calculations, and transient absorbance spectroscopy indicate the SLG has little electronic impact on the individual semiconductors. In the CsPbBr3/ SLG/CsPbI3, we find a type I band alignment that supports transfer of photogenerated carriers across the heterointerface. Light-emitting diodes (LEDs) show electroluminescence from both the CsPbBr3 and CsPbI3 layers with no evidence of ion diffusion during operation. Our approach provides opportunities to design novel all-perovskite heterostructures to facilitate the control of charge and light in optoelectronic applications.