| 摘要 |
A solar cell that is capable of having a thickness optimum for the highest photoelectric conversion efficiency and achieves reduction of carrier recombination loss is provided. For this purpose, a solar cell (10) is formed by stacking a top cell (12) including an n+ layer, a p layer, and a p+ layer, and a bottom cell (14) including an n+ layer and a p+ layer arranged at the bottom of the p layer along the back surface. The top cell (12) has a band gap wider than that of the bottom cell (14). A top electrode (18) is formed at the n+ layer of the top cell (12), while a negative electrode (26) and a positive electrode (28) are individually connected to the n+ layer and the p+ layer of the bottom cell (14), respectively. These negative and positive electrodes (26, 28) serve as a pair of electrodes of the bottom cell (14) and the positive electrode (28) is also used as the other electrode of the top cell (12), forming a pair with the top electrode (18) which is one electrode of the top cell (12). As a result, the minority carriers generated in the top and bottom cells (12, 14) can be individually obtained from the electrodes of the respective cells where they are generated.
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