Single-Crystal Hybrid Perovskite Platelets on Graphene : A Mixed-Dimensional Van Der Waals Heterostructure with Strong Interface Coupling

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhixiong Liu
  • Lu You
  • Nastaran Faraji
  • Chun-Ho Lin
  • Xiangming Xu
  • Jan Seidel
  • Junling Wang
  • Husam N. Alshareef
  • Tom Wu

Detail(s)

Original languageEnglish
Article number1909672
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number12
Online published22 Jan 2020
Publication statusPublished - Apr 2020

Abstract

Van der Waals (vdW) heterostructures open up excellent prospects in electronic and optoelectronic applications. In this work, mixed-dimensional metal-halide perovskite/graphene heterostructures are prepared through selective growth of CH3NH3PbBr3 platelets on patterned single-layer graphene using chemical vapor deposition. Preferred growth of single-crystal CH3NH3PbBr3 platelets on graphene surfaces is achieved, which is accompanied by significant photoluminescence quenching. Raman spectra reveal that perovskite platelets cause p-type doping in the graphene layer. A significant Fermi level decrease of 272 meV in graphene is estimated, which corresponds to a high doping density of 7.5 × 1012 cm−2. Surface potentials measured by Kelvin probe force microscopy indicate a negatively charged perovskite surface under illumination, which is consistent with the upward band bending deduced from conducting atomic force microscopy measurements. Moreover, a field-effect phototransistor is fabricated using the perovskite/graphene heterostructure channel, and the increased Dirac voltage under illumination confirms an enhanced p-type character in graphene. These findings enrich the understanding of strong interface coupling in such mixed-dimensional vdW heterostructures and pave the way toward novel perovskite-based optoelectronic devices.

Research Area(s)

  • graphene, heterostructures, perovskites, platelets, selective growth

Citation Format(s)

Single-Crystal Hybrid Perovskite Platelets on Graphene : A Mixed-Dimensional Van Der Waals Heterostructure with Strong Interface Coupling. / Liu, Zhixiong; You, Lu; Faraji, Nastaran; Lin, Chun-Ho; Xu, Xiangming; He, Jr-Hau; Seidel, Jan; Wang, Junling; Alshareef, Husam N.; Wu, Tom.

In: Advanced Functional Materials, Vol. 30, No. 12, 1909672, 04.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review