US 12,435,100 B2
Perovskite solar cells
Letian Dou, West Lafayette, IN (US); and Ke Ma, West Lafayette, IN (US)
Assigned to Purdue Research Foundation, West Lafayette, IN (US)
Filed by Purdue Research Foundation, West Lafayette, IN (US)
Filed on Jan. 28, 2022, as Appl. No. 17/586,869.
Claims priority of provisional application 63/145,668, filed on Feb. 4, 2021.
Prior Publication US 2022/0246865 A1, Aug. 4, 2022
Int. Cl. C07F 7/24 (2006.01); C07F 7/22 (2006.01); H01G 9/00 (2006.01); H01G 9/20 (2006.01); H10K 30/40 (2023.01); H10K 30/50 (2023.01); H10K 30/81 (2023.01); H10K 71/12 (2023.01); H10K 85/30 (2023.01); H10K 85/50 (2023.01)
CPC C07F 7/24 (2013.01) [C07F 7/2208 (2013.01); H01G 9/0036 (2013.01); H01G 9/2009 (2013.01); H10K 30/81 (2023.02); H10K 71/12 (2023.02); H10K 85/30 (2023.02); H10K 85/50 (2023.02); H10K 30/40 (2023.02); H10K 30/50 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A solar cell comprising, from bottom to top, a support layer; an electron transporting layer; a 3D perovskite layer; a multifunctional 2D perovskite capping layer; a hole transporting layer; and a counter electrode layer, wherein the 2D perovskite capping layer comprises an organic-inorganic hybrid perovskite of Formula I:
(R1NH3+)2(A+)n−1(M2+)n(X−)3n+1  I
wherein:
(R1NH3+) represents an asymmetric mono-ammonium cationic moiety:

OG Complex Work Unit Chemistry
A+ represents a cation Cs+, Rb+, CH3NH3+, CH3CH2NH3+, or

OG Complex Work Unit Chemistry
R2 is —H, —F, —Cl, —Br, —I, —Me, —Et, —OMe, —OEt, —SMe, —SEt, —CN, —NO2, —COMe, —CHO, —COOMe, or —NH—COMe;
(Ar)m represents a conjugated and optionally substituted aryl or hetero aryl system, or a combination thereof, wherein each aryl or hetero aryl ring in the conjugated and optionally substituted aryl or hetero aryl system may be same or different;
M2+ represents a divalent metal cation Pb2+, Sn2+, Ge2+, Cu2+, Zn2+, Cd2+, Hg2+, Ni2+, Co2+, Fe2+, Mn2+, Cr2+, V2+, Pd2+, Pt2+, or a combination thereof; or a combination of one monovalent metal cation selected from the group consisting of Ag+, Cu+, Tl+, Au+, and one trivalent metal cation selected from the group consisting of Bi3+, Sb3+, In3+, As3+, Au3+, Y3+, to make the average valence of the metal cation to be 2+;
X is F, Cl, Br or I;
l is 1-4;
m is 0-5; and
n is 1-6;
wherein the positions of R2 and (Ar)m on the thiophenyl ring can be exchanged;
where the 2D perovskite capping layer is the interfacial layer which supports interface charge transfer;
where the 3D perovskite layer is light absorbing material and the major light absorbing layer; and
where the 3D perovskite layer and multifunctional 2D perovskite capping layer form a 2D/3D perovskite heterostructure which supports interface charge transfer.