Solar cell, photovoltaic module, and electrical device

A solar cell, comprising:

• a plurality of sub-cells;
• a plurality of dead zones, each disposed between two adjacent sub-cells to implement an electrical connection between the two adjacent sub-cells;
• wherein:
• the plurality of sub-cells are disposed sequentially along a first direction, each of the plurality of sub-cells comprises a first photovoltaic conversion layer for performing photovoltaic conversion, and the first direction is perpendicular to a thickness direction of the plurality of sub-cells;
• and
• along the first direction, a trend of change in a thickness of the first photovoltaic conversion layer of each of the plurality of sub-cells is:
• negatively correlated to a trend of change in a cross-sectional area, perpendicular to the thickness direction, of the first photovoltaic conversion layer, so as to improve uniformity of photocurrents output by all the plurality of sub-cells;
• and
• positively correlated to a trend of change in a cross-sectional area, perpendicular to the thickness direction, of each of the plurality of dead zones.