| 摘要 |
PROBLEM TO BE SOLVED: To prevent a photovoltaic device from deteriorating in conversion efficiency due to an increase in temperature by a method wherein the sum of the tin and tin oxide content of one of transparent conductive layers nearest to a joint surface between a P-type semiconductor layer and a transparent conductive layer is set lower than those of the other conductive layers. SOLUTION: For instance, a transparent conductive layer 102 is composed of two laminated layers. That is, a first transparent conductive layer 103 and a second transparent conductive layer 104 are successively laminated on a P-type semiconductor layer 101 and the first transparent conductive layer 103 is lower in tin concentration than the second transparent conductive layer 104. In this case, as the first transparent conductive layer 103 is low in tin concentration, it is comparatively small in energy gap as to a tunnel current, Therefore a tunnel current gets large, an excess electromotive force is not generated, a photovoltaic device of this constitution can be improved in release voltage, a short circuit current, and photoelectric conversion efficiency, At this point, the sum of oxide tin and tin content of a layer nearest to a joint surface amounts to 10% mole or less. |
