Polymer, perovskite solar cell, photovoltaic module and electric device

The invention provides a polymer, a perovskite solar cell, a photovoltaic module and an electric device. The polymer comprises a repeating unit shown as a formula (I):-M-R-Y-formula (I), in the formula (I), M is selected from substituted or unsubstituted anilino, substituted or unsubstituted carbazolyl, substituted or unsubstituted acridinyl, substituted or unsubstituted thiophenazinyl or substituted or unsubstituted phenoxazinyl; r is selected from substituted or unsubstituted C1-C10 alkyl groups; y is selected from carboxyl or salts thereof, phosphate or salts thereof, and sulfo or salts thereof. When the polymer is applied to the perovskite solar cell, the photoelectric conversion efficiency of the perovskite solar cell can be improved.