DPP-based asymmetric porphyrin donor photovoltaic material and preparation method and application thereof

The invention belongs to the field of organic solar cell material synthesis, and particularly relates to an asymmetric porphyrin donor photovoltaic material based on DPP and a preparation method and application thereof. The structural formula of the DPP-based asymmetric porphyrin donor photovoltaic material is shown as a formula (I), and R is an alkyl or alkoxy substituted aromatic group; m represents a metal ion; a and A'are end group electron withdrawing units, and A and A 'are different. According to the invention, meso sites at two ends of porphyrin are connected with different DPPs through acetylenic bonds to synthesize an asymmetric porphyrin micromolecule donor material. DPP is used as an electron-withdrawing terminal group, and intramolecular charge transfer is formed by cooperation of a pi bridge formed by acetylenic bonds and an electron-donating porphyrin core. The acetylenic bond is connected with porphyrin and electron-withdrawing units at two ends, so that a conjugate plane is enlarged, intramol