Fullerene-based electron transport material with Lewis base group and application of fullerene-based electron transport material

The invention belongs to the field of new energy photovoltaics, provides a fullerene-based electron transport material with a Lewis base group and application of the fullerene-based electron transport material, prepares two low-cost and high-efficiency fullerene-based electron transport materials, and applies the two low-cost and high-efficiency fullerene-based electron transport materials to preparation of a perovskite solar cell with a trans-plane structure. The main scheme is as follows: the method comprises the following steps: dissolving malonic acid and thiophenemethanol in dichloromethane, adding a condensing agent N, N '-dicyclohexylcarbodiimide and an organic alkali 4-dimethylaminopyridine to react, carrying out reduced pressure rotary evaporation concentration after the reaction is completed, and separating and purifying through a silica gel chromatographic column to obtain bis (thiophene-2-methyl) malonate; then dissolving in dichloromethane to obtain a solution A; adding fullerene ...