NOVELTY - An organic solar cell has a first electrode and a second electrode on a substrate. An electrical hole is formed between the electrodes. An electron-receptor and a photoactive layer are formed with a fused ring system compound. Argon is selected from benzene, naphthalene, anthracene and pyrene, where the argon has 6-20 carbon atoms. The pyrene is chosen from electron withdrawing group with Xn, where n is number of X as mentioned in a formula, introduced in the fused ring system compound. Yn is chosen form electron donating group, where n is number of Y introduced in the fused ring system compound.    USE - Organic solar cell.    DETAILED DESCRIPTION - An organic solar cell has a first electrode and a second electrode formed on a substrate. An electrical hole is formed between the first electrode and the second electrode. An electron-receptor and a photoactive layer are formed with a fused ring system compound. Argon comprises benzene, naphthalene, anthracene and pyrene, where the argon has 6-20 carbon atoms. The pyrene is chosen from electron withdrawing group with Xn, where n is number of X introduced in the fused ring system compound, and the n is less than or equal to greater than 2 and 8. Yn is chosen form electron donating group, where n is number of Y introduced in the fused ring system compound, and the n is less than or equal to greater than 2 and 8. Zinc is hetero alkoxy group, substituted or unsubstituted C6-C30 of alkoxy group, substituted or unsubstituted C1-C30 of heteroalkyl group, substituted or unsubstituted C1-C30 of alkyl group, substituted or unsubstituted C1-C30 of hydrogen atom, carbon system of substituted or unsubstituted C1-C30, arylalkyl group of substituted or unsubstituted C6-C30, aryloxy group of substituted or unsubstituted C6-C30, heteroaryl group of substituted or unsubstituted C2-C30, heterocycloalkyl of cycloalkyl group, substituted or unsubstituted C2-C30 of heteroaryloxy group, substituted or unsubstituted C5-C20 of heteroarylalkyl, or substituted or unsubstituted C2-C30 of substituted or unsubstituted C2-C30, where n is number of Z introduced in the fused ring system compound, and the n is less than or equal to greater than 2 and 8.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of an organic solar cell.