Polymer, organic solar cell comprising polymer, perovskite solar cell comprising polymer
The present invention relates to a polymer, an organic solar cell comprising the polymer, and a perovskite solar cell comprising the polymer. The polymer according to the present invention has excellent absorption ability for visible light and an energy level suitable for the use as an electron donor compound in a photo-active layer of the organic solar cell, thereby increasing the light conversion efficiency of the organic solar cell. In addition, the polymer according to the present invention has high hole mobility, and is used as a compound for a hole transport layer, and thus can improve efficiency and service life of the perovskite solar cell without an additive.
1. An organic solar cell comprising:
a first electrode and a second electrode disposed facing each other; and
a photo-active layer disposed between the first electrode and the second electrode,
wherein the photo-active layer comprises polymer for a photo-active layer of an organic solar cell which is represented by the following Structural Formula 1:
wherein in Structural Formula 1,
X 1 , X 2 , X 3 and X 4 are each independently O, S, Se, NH, or NR′,
R 1 , R 2 , R 3 and R 4 are each independently an alkyl group having 1 to 50 carbon atoms, an aryl group having 6 to 50 carbon atoms, or —COOR′,
A 1 , A 2 , A 3 , and A 4 are each independently H, F, CN, or —COOR′,
R′ is an alkyl group having 1 to 50 carbon atoms or an aryl group having 6 to 50 carbon atoms, and
n is an integer ranging from 1 to 1000,
wherein the polymer for a photo-active layer has a crystalline coherence length (CCL) in the range of 25 Å to 30 Å.
2. The organic solar cell of claim 1 , wherein the first electrode is a transparent electrode and the second electrode is a metal electrode, and
wherein the organic solar cell further includes a substrate positioned on a surface of the first electrode opposite to a surface on which the photo-active layer is present.
3. The organic solar cell of claim 1 , wherein the photo-active layer is a bulk-heterojunction layer which further includes an electron acceptor compound.
4. The organic solar cell of claim 3 , wherein the electron acceptor compound is any one selected from a group consisting of fullerene, fullerene derivatives, carbon nanotubes, carbon nanotube derivatives, bathocuproine, semiconductor elements, semiconductor compounds, and a combination thereof.
5. The organic solar cell of claim 1 , wherein a light conversion efficiency (%) is 8% or more, wherein the 8% light conversion efficiency means that when 100 solar energy units is input, 8 or more electrical energy units is produced.