| 摘要 |
A solar battery (10) comprising an upper cell (12) including an n + layer, a p layer and p + layer; and a lower cell (14) including n - layers and p + layers arranged on the back side under the p layer, the upper and lower cells being stacked together. The solar battery can have the most suitable thickness in terms of photoelectric efficiency and reduce carrier recombination loss. The upper cell (12) has a larger band gap than the lower cell (14). The upper cell (12) includes an upper electrode (18) formed on its n + layer, while the lower cell (14) includes negative electrodes (26) connected respectively with its n + layers and positive electrodes (28) connected respectively with its p + layers. The negative electrodes (26) are paired with the corresponding positive electrodes (28), and the positive electrodes (28) also act as the counterpart of the upper electrode (18) of the upper cell (12). In this structure, minority carriers appearing in the lower cell (14) are withdrawn by the electrodes in the cell. |
