Hole-transporting material for inorganic/organic hybrid perovskite solar cells
Provided is a hole-transporting compound having a novel structure, and more particularly, a hole-transporting compound for an inorganic/organic hybrid perovskite solar cell. An inorganic/organic hybrid perovskite-based solar cell using the hole-transporting compound according to the present invention has significantly high power generation efficiency.
1. A hole-transporting compound for an inorganic/organic hybrid perovskite solar cell, the hole-transporting compound represented by Chemical Formula 1,
in Chemical Formula 1,
Z 1 to Z 4 and Z 11 to Z 14 are each independently O, S, or Se; and
R 1 to R 4 and R 11 to R 14 are each independently (C1-C7)alkyl.
2. The hole-transporting compound of claim 1 , wherein Z 1 to Z 4 and Z 11 to Z 14 are each independently O or S; and
R 1 to R 4 and R 11 to R 14 are each independently (C1-C3)alkyl.
3. The hole-transporting compound of claim 2 , wherein Z 1 to Z 4 are O; and
R 1 to R 4 are each independently (C1-C3)alkyl.
4. The hole-transporting compound of claim 1 , wherein the hole-transporting compound of Chemical Formula 1 is represented by the following Chemical Formula 1-1,
in Chemical Formula 1-1,
Z 11 to Z 14 are each independently O, S, or Se; and
R 11 to R 14 are each independently (C 1 -C7)alkyl.
5. A solar cell comprising a hole transporting layer containing a hole-transporting compound for an inorganic/organic hybrid perovskite solar cell, represented by the following Chemical Formula 1,
in Chemical Formula 1,
Z 1 to Z 4 and Z 11 to Z 14 are each independently O, S, or Se; and
R 1 to R 4 and R 11 to R 14 are each independently (C1-C7)alkyl.
6. The solar cell of claim 5 , wherein the hole transporting layer further contains a phthalocyanine derivative.
7. The solar cell of claim 6 , wherein the phthalocyanine derivative is represented by the following Chemical Formula 8,
in Chemical Formula 8,
M is copper (Cu), zinc (Zn), cobalt (Co), lead (Pb), silver (Ag), magnesium (Mg), iron (Fe), titanyl, or vanadyl; and
R 21 to R 24 are each independently hydrogen, (C1-C7)alkyl, (C1-C7)alkoxy, or sulfonic acid group (—SO 3 H).
8. The solar cell of claim 7 , wherein the phthalocyanine derivative is contained at a content of 0.1 to 15 parts by weight based on 100 parts by weight of the hole-transporting compound for an inorganic/organic hybrid perovskite solar cell.
9. The solar cell of claim 5 , wherein it includes: a first electrode; a composite layer positioned on the first electrode and impregnated with a light harvester; a overlayer of light harvester positioned on the composite layer and made of the light harvester; the hole transporting layer positioned on the overlayer of light harvester; and a second electrode positioned on the hole transporting layer.