Organic solar cell and manufacturing method therefor

An organic solar cell comprising:

• a first electrode;
• a second electrode which is disposed to face the first electrode;
• and
• an organic material layer having one or more layers which includes a photoactive layer disposed between the first electrode and the second electrode,
• wherein the one or more layers of the organic material layer include four or more regions having different thicknesses,
• wherein the organic material layer including the four or more regions having different thicknesses has a thickness of 30 nm to 600 nm,
• wherein the four or more regions having different thicknesses comprise regions with a difference in thicknesses of from 10 nm to 570 nm,
• wherein the four or more regions having different thicknesses have different absorbances in at least a portion of visible rays,
• wherein the four or more regions having different thicknesses display different colors,
• wherein the organic material layer including the four or more regions having different thicknesses is the photoactive layer,
• wherein the photoactive layer includes an electron donor material and an electron acceptor material,
• wherein the electron donor material includes at least two of the following Chemical Formulae 1-1 to 1-5, and
• wherein the Chemical Formulae 1-1 to 1-5 have an orange, red, green, violet, and dark blue color, respectively:
• wherein:
• X1 to X8 are the same as or different from each other and are each independently SiRR′ or NR;
• R, R′, and R1 to R10 are the same as or different from each other and are each independently an alkyl group;
• a, b, c, d, e, f, g, and h are the same as or different from each other and are each independently a real number that is greater than 0 and less than 1;
• a+b=1;
• c+d=1;
• e+f=1;
• g+h=1;
• and
• n is an integer from 1 to 10,000.