LEAD-FREE DOUBLE PEROVSKITES FOR PHOTOVOLTAIC APPLICATIONS

• US 20190330075A1
• Filed: 04/30/2019
• Published: 10/31/2019
• Est. Priority Date: 04/30/2018
• Status: Active Application

• Current Assignee: TRIAD National Security, LLC, Washington University In St Louis
• Original Assignee: Traid National Security LLC, Washington University In St Louis
• Inventors: Mishra, Rohan, Thind, Arashdeep Singh, Pilania, Ghanshyam, Kavadiya, Shalinee, Biswas, Pratim
• Application Number:
  US16/399,001
• Publication Number:
  US 20190330075A1
• Time in Patent Office: Days
• CPC Class Codes: C01B 19/002 Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions
• CPC Class Codes: C01G 29/006 Compounds containing, besides bismuth, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2002/34 perovskite-type (ABO3)
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/85 by XPS, EDX or EDAX data
• CPC Class Codes: C01P 2002/88 by thermal analysis data, e.g. TGA, DTA, DSC
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: H01L 31/032 including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312
• CPC Class Codes: H01L 31/04 adapted as photovoltaic [PV] conversion devices testing thereof during manufacture H01L22/00; testing thereof after manufacture H02S50/10
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

The present disclosure is directed to double perovskite oxide semiconductors. In particular, the present disclosure is directed to lead-free double perovskite oxides that provide excellent stability and are used, for example, as photovoltaic materials.

Claims

1. A lead-free double perovskite having a formula of AA′

BB′

O_n, wherein A and A′

are the same or are different and are selected from the group consisting of alkali metals, alkaline earth metals, actinides, transition metals, post-transition metals and metalloids;

B and B′

are different and selected from the group consisting of alkali metals, alkaline earth metals, actinides, transition metals, post-transition metals and metalloids; and

n is a real number from 2 to 6.

2. The lead-free double perovskite according to claim 1, wherein B or B′

is Bi³⁺.

3. The lead-free double perovskite according to claim 1, wherein the sum of the oxidation states of A, A′

and B is 9.

4. The lead-free double perovskite according to claim 1, wherein A and A′

are different.

5. The lead-free double perovskite according to claim 1, wherein A and A′

are the same.

6. The lead-free double perovskite according to claim 1, wherein n=6.

7. The lead-free double perovskite according to claim 1, wherein the double perovskite has a formula of KBaTeBiO₆.

8. The lead-free double perovskite according to claim 1, wherein the double perovskite is other than RbMgTeBiO₆, NaCaTeBiO₆ or KCaTeBiO₆.

9. The lead-free double perovskite according to claim 1, wherein the band gap is from about 1.0 to about 3.0 eV.

10. The lead-free double perovskite according to claim 1, wherein the Δ

H_f for the lead-free double perovskite is at or below 100 meV/atom for the ground state structure.

11. A semiconductor comprising a lead-free double perovskite having a formula of AA′

BB′

O_n,

wherein A and A′

are the same or are different and are selected from the group consisting of alkali metals, alkaline earth metals, actinides, transition metals, post-transition metals and metalloids;

B and B′

are different and selected from the group consisting of alkali metals, alkaline earth metals, actinides, transition metals, post-transition metals and metalloids; and

n is a real number from 2 to 6.

12. The semiconductor according to claim 11, wherein B or B′

is Bi³⁺.

13. The semiconductor according to claim 11, wherein the sum of the oxidation states of A, A′

and B is 9.

14. The semiconductor according to claim 11, wherein n=6.

15. The semiconductor according to claim 11, wherein the double perovskite has a formula of KBaTeBiO₆.

16. A photovoltaic cell comprising a lead-free double perovskite having a formula of AA′

BB′

_n,

wherein A and A′

are the same or are different and are selected from the group consisting of alkali metals, alkaline earth metals, actinides, transition metals, post-transition metals and metalloids;

B and B′

are different and selected from the group consisting of alkali metals, alkaline earth metals, actinides, transition metals, post-transition metals and metalloids; and

n is a real number from 2 to 6.

17. The photovoltaic cell according to claim 16, wherein B or B′

is Bi³⁺.

18. The photovoltaic cell according to claim 16, wherein the sum of the oxidation states of A, A′

and B is 9.

19. The photovoltaic cell according to claim 16, wherein n=6.

20. The photovoltaic cell according to claim 16, wherein the double perovskite has a formula of KBaTeBiO₆.