Octahedral perovskite materials with small radius metal center and uses thereof

Patent metadata

Field	Value
Publication number	US-12538697-B2
Application number	US-202217672286-A
Country	US
Kind code	B2
Filing date	Feb 15, 2022
Priority date	Feb 15, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

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.

First claim

The invention claimed is:

1 . A 2D metal halide perovskite material having the Formula (I):
A 2 BX 4   (I)
wherein A has the formula:

wherein Y is F, Br, Cl or I;
each of Z 1 to Z 4 is independently selected from CH or N;
B is Ge; and
X is I.

2 . The perovskite material of claim 1 , wherein A has the formula:

wherein Y is Fl, Br, Cl or I.

3 . 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.

Assignees

• Huawei Tech Canada Co Ltd

Inventors

• Morteza Najjariyan Amin
• Hoogland Sjoerd
• Sargent Edward

Classifications

• C09K2211/188

  of other metals not provided for in one of the previous groups · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• H01G9/2059

  comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• C07F7/30

  Germanium compounds · CPC title