TREA

OCTAHEDRAL PEROVSKITE MATERIALS WITH SMALL RADIUS METAL CENTER AND USES THEREOF

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Information

  • Patent Application
  • 20230301166
  • Publication Number
    20230301166
  • Date Filed
    February 15, 2022
    2 years ago
  • Date Published
    September 21, 2023
    a year ago
Information
Abstract
Ge-centered octahedral perovskites have heretofore not been achievable due to collapse of the perovskite structure into non-octahedral units due to a lack of B site support from the small-radius Ge atom, which breaks Goldschmidt’s rules for constructing octahedral perovskites. To overcome this shortcoming, a strategy was developed to form a strong cage with the A sites in which the octahedron is forced to remain intact. Strong intermolecular interaction between the organic A site cations were used to stabilize the symmetric Ge octahedral perovskite beyond the Goldschmidt’s rules. The molecules used based on Y-PMA (Y: F, Cl, Br, I) that facilitated strong halogen bonding to form the cage around the octahedral. Octahedral Ge perovskites exhibit a direct bandgap in contrast to the indirect bandgap of non-octahedral Ge perovskites are demonstrated. In addition, the octahedral Ge perovskite exhibited a dramatic increase in the carrier mobility. A photodetector made with the stabilized octahedral perovskite material exhibited a vastly better responsivity than non-octahedral Ge perovskites.
Description
Claims
  • 1. A 2D metal halide perovskite material having the Formula (I): wherein A has the formula: wherein Y is F, Br, Cl or I;each of Z1 to Z4 is independently selected from CH or N;B is Ge, Cu, Ga or Sb; andX is Cl, Br, or I.
  • 2. The perovskite material of claim 1, wherein A has the formula: wherein Y is F, Br, Cl or l.
  • 3. The perovskite material of claim 1, wherein A has the formula: wherein Y is Fl, Br, Cl or l.
  • 4. The perovskite material of claim 3, wherein B is Ge.
  • 5. A semi-2D metal halide perovskite material having the Formula (II): wherein A has the formula: wherein n is 1 to 12;Y is F, Br, Cl or I;each of Z1 to Z4 is independently selected from CH or N;A′ is Cs+, NH3+, CH2NH3+ or CHNH2NH3+;B is Ge, Cu, Ga or Sb; andX is Cl, Br or I.
  • 6. The perovskite material of claim 5, wherein A has the formula: wherein Y is F, Br, Cl or l.
  • 7. The perovskite material of claim 5, wherein A has the formula: wherein Y is Fl, Br, Cl or l.
  • 8. The perovskite material of claim 7, wherein A′ is Cs.
  • 9. The perovskite material of claim 8, wherein B is Ge.
  • 10. An optoelectronic device comprising a perovskite material as defined in claim 1, wherein the optoelectronic device is selected from a sensor, a photodetector, a light emitting diode, an electro-optic modulator and a solar cell.
  • 11. An optoelectronic device comprising a perovskite material as defined in claim 4, wherein the optoelectronic device is selected from a sensor, a photodetector, a light emitting diode, an electro-optic modulator and a solar cell.
  • 12. An optoelectronic device comprising a perovskite material as defined in claim 5, wherein the optoelectronic device is selected from a sensor, a photodetector, a light emitting diode, an electro-optic modulator and a solar cell.
  • 13. An optoelectronic device comprising a perovskite material as defined in claim 9, wherein the optoelectronic device is selected from a sensor, a photodetector, a light emitting diode, an electro-optic modulator and a solar cell.