Electric Modulation of Conduction in MAPbBr3 Single Crystals

Abstract

The resistive switching (RS) mechanism of hybrid organic-inorganic perovskites is an open question until now. Here, a switchable diode-like RS behavior in MAPbBr3 single crystals using Au (or Pt) symmetry electrodes is reported. Both the high resistance state (HRS) and low resistance state (LRS) are electrode-area dependent and light responsive. We propose an electric-field-driven inner p-n junction accompanied by an interface trap-controlled SCLC mechanism to explain this switchable diode-like RS behavior in MAPbBr3 single crystals.

Ligand-modified synthesis of shape-controllable and highly luminescent CsPbBr3 perovskite nanocrystals under ambient conditions

“…32 As far as is known, the abundant bromine vacancy defects (V Br ) tend to form on the surface of CsPbBr 3 nanocrystals due to its low formation energy and the ionic crystal nature of the perovskites. 33,34 With the increase of the OTAm/OT mole ratio from 0.1 : 1 to 1 : 1, the surface Br − can be stabilised by the OTAm + ligands via the hydrogen bonding of N-H⋯Br, 33,35 which caused the obvious enhancement of the Br/Pb ratio from 2.78 to 2.95. However, the Br/Pb ratio of the CsPbBr 3 nanocrystals exhibited a slight decline to 2.89 when the OTAm/ OT mole ratio was further increased to 8 : 1.…”

“…S12 (ESI †), which was due to the decomposition of the ionic crystal structure of perovskite under a polar environment. 33,34 Future studies will focus on how to improve the polar solvent resistance of the perovskites.…”

Highly efficient silica coated perovskite nanocrystals with the assistance of ionic liquids for warm white LEDs

“…During the past decade, the scientific community has witnessed a booming development of perovskite nanocrystals (NCs), which stand out with their unparalleled photoelectric performances, such as high defect tolerance, wide tunable emission wavelength, and narrow emission line width. [1][2][3][4][5][6][7][8] These extraordinary properties make them an underlying game changer, and have great application prospects in the field of photovoltaics, 9,10 light-emitting diodes (LEDs), [11][12][13] anti-counterfeiting, 14,15 photodetectors, 16,17 and so forth. Until now, lots of state-of-the-art methods have been employed to synthesize perovskite NCs with excellent emission performance.…”

“…Until now, lots of state-of-the-art methods have been employed to synthesize perovskite NCs with excellent emission performance. 5,6,[18][19][20][21] Unfortunately, the issue of their intrinsic instability toward humidity, polar solvents, heat, and light irradiation, which results from the ionic structure of perovskite NCs and the highly dynamic of surface ligands, has become the major obstacle on the road of commercial applications. 22,23 Recently, various strategies aimed at improving the stability of perovskite NCs have been developed, including surface engineering, compositional regulation, and shell encapsulation.…”