Lead-free ytterbium-doped double perovskite thin films
AssigneeNew York University
InventorsEray Aydil, Minh Tran, Iver Cleveland
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Abstract
Described is a thin film comprising a Yb-doped double perovskite, wherein the double perovskite has the formula M2AYbxB(1-x)X6; wherein each occurrence of M independently represents Cs or Rb; A represents Ag or Cu; B represents Bi, In, Sb, or Ga; x has a value between 0.01 and 0.20; and each X independently represents F, Cl, Br, or I. Also described is a method of making the thin films. The thin film may be useful in photovoltaic devices.
Claims20
A thin film comprising a Yb-doped double perovskite, wherein the double perovskite has the formula M2AYbxB(1-x)X6;
- wherein each occurrence of M independently represents Cs or Rb;
- A represents Ag or Cu;
- B represents Bi, In, Sb, or Ga;
- x has a value between 0.01 and 0.20;
- and
- each X independently represents F, Cl, Br, or I.
A method of formulating a thin film, the method comprising the steps of:
- providing a substrate;
- providing a source of BX3;
- providing a source of YbX3;
- providing a source of AX;
- depositing BX3, YbX3, and AX on the substrate, wherein a ratio of molar flux of YbX3 to molar flux of BX3 is between 0.01 and 0.15;
- providing a source of MX;
- depositing MX on the substrate to provide a perovskite mixture;
- and
- annealing the mixture to provide a Yb-doped double perovskite thin film;
- wherein M represents Cs or Rb;
- A represents Ag, Cu, or Au;
- B represents Bi, In, Sb and Ga;
- and
- each X independently represents F, Cl, Br, or I.
A thin film comprising a Yb-doped double perovskite produced with a method comprising the steps of:
- providing a substrate;
- providing a source of BX3;
- providing a source of YbX3;
- providing a source of AX;
- depositing BX3, YbX3, and AX on the substrate, wherein a ratio of molar flux of YbX3 to molar flux of BX3 is between 0.01 and 0.15;
- providing a source of MX;
- depositing MX on the substrate to provide a perovskite mixture;
- and
- annealing the mixture to provide a Yb-doped double perovskite thin film;
- wherein M represents Cs or Rb;
- A represents Ag, Cu, or Au;
- B represents Bi, In, Sb and Ga;
- and
- each X independently represents F, Cl, Br, or I.
Dependencies are inferred from the claim text.