US 12,033,811 B2
Solar cell
Kay Lederer, Dresden (DE); Steffen Runge, Dresden (DE); Hendrik Bolink, Moncada (ES); Michele Sessolo, Valencia (ES); Jorge Avila, Valencia (ES); Maria Grazia La Placa, Valencia (ES); and Pablo B. Boix, Valencia (ES)
Assigned to Novaled GmbH, Dresden (DE)
Filed by Novaled GmbH, Dresden (DE)
Filed on Jul. 2, 2019, as Appl. No. 16/459,789.
Prior Publication US 2021/0005397 A1, Jan. 7, 2021
Int. Cl. H01G 9/20 (2006.01); H10K 30/30 (2023.01); H10K 30/80 (2023.01)
CPC H01G 9/2009 (2013.01) [H10K 30/30 (2023.02); H10K 30/80 (2023.02)] 7 Claims
OG exemplary drawing
 
1. Solar cell comprising:
a) a first electrode having a first surface and a second surface opposite the first surface;
b) a second electrode having a first surface and a second surface opposite the first surface; and
c) a first stack of layers provided between and in direct contact with the first surface or the second surface of the first electrode and the second surface or the first surface, respectively, of the second electrode;
wherein the first stack of layers comprises
(c1) one light absorbing layer provided with a perovskite crystal structure; and
(c2) a dopant layer, wherein the dopant layer consists of
a p-type dopant material, the p-type dopant material having a molecular weight from about 350 g/mol to about 1700 g/mol,
the first stack of layers comprises only p-type dopant layers and does not comprise n-type dopant layers;
the dopant layer is arranged between the first electrode and the light absorbing layer; and
the p-type dopant material is an organic compound or a metal-organic compound, wherein a total amount of electron withdrawing groups in the organic compound or the metal-organic compound is from 17 atomic percent to 90 atomic percent based on a total number of atoms in the p-type dopant material, wherein the electron withdrawing groups are independently selected from the group consisting of fluorine, chlorine, bromine, and CN.