Mask and solar cell

The invention discloses a mask and a solar cell, relates to the technical field of photovoltaics, and aims to improve the pattern of the mask and avoid narrowing or line breakage of an electrode. The mask comprises a base film and an adhesive layer which are stacked, the base membrane comprises a polymeric membrane; the polymeric membrane is made of a high-molecular polymer; the mask plate is provided with a plurality of slits; each slit penetrates through the base film and the adhesive layer; each slit comprises a first section, a second section and a third section which are continuous, the second section is located between the first section and the third section, and the length of the second section of each slit accounts for 75%-85% of the total length of the slit; the width error of the second section of each slit is less than or equal to 10%; the width error refers to the percentage of the difference value between the width of any position on the slit and the width average value of the section where the p