Conjugated polymer and application thereof

A conjugated polymer, which is a random copolymer, with Formula I:

• wherein
• wherein R1 is selected from the group consisting of C1-C30 alkyl, C1-C30 branched alkyl, C1-C30 silane, C1-C30 ester, C1-C30 alkoxy, C1-C30 alkylthio, C1-C30 haloalkyl, C1-C30 carbon chain containing double bond or triple bond, C1-C30 alkyl chain substituted by cyano, nitro, hydroxyl or keto, and halo group;
• D1 and D2 are respectively selected from the group consisting of
• A2 is selected from the group consisting of:
• each π is independently selected from one of the following groups:
• wherein R1, R2, R3 and R4 are independently selected from the group consisting of C1-C30 alkyl, C1-C30 branched alkyl, C1-C30 silane, C1-C30 ester, C1-C30 alkoxy, C1-C30 alkylthio, C1-C30 haloalkyl, C1-C30 carbon chain containing double bond or triple bond, C1-C30 alkyl chain substituted by cyano, nitro, hydroxyl or keto, and halo group;
• wherein Ar1 and Ar2 are independently selected from the group consisting of fused aromatic hydrocarbons, benzene fused heterocylic compounds, fused heterocylic compounds, benzene, five-membered heterocyclic ring and six-membered heterocyclic ring, wherein the benzene, the five-membered heterocyclic ring and the six-membered heterocyclic ring comprise C1-C30 alkyl groups, C1-C30 branched alkane, C1-C30 silane, C1-C30 ester, C1-C30 alkoxy, C1-C30 alkylthio, C1-C30 haloalkyl, C1-C30 carbon chain containing double bond or triple bond, C1-C30 alkyl chain containing cyano, nitro, hydroxyl or keto, or halo group;
• and
• m and n are any integers selected from 2 to 200, respectively.