TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The cell body includes pn-junctions of compounds having different band gaps. The pn-junction layers are arranged such that band gap becomes higher from the side of the first electrode to the sunlight entering side. The first electrode is formed of a transparent conductive film. The solar battery further includes another cell body adhered to that side of the first electrode that is opposite to the sunlight entering side. The cell body has pn-junction layers arranged to have a band gap made higher from the side of the first electrode to the side of a second electrode to which sunlight enters. The other cell body has a pn-junction layer having a band gap still lower than the band gap of the cell body.Preferred Property: The cell body and the first electrode are flexible. The first electrode has a thickness that allows deflection.Preferred Method: The method also involves, between the step of forming first and second cell layers, forming third cell layer having a third band gap lower than the first band gap and higher than the second band gap. It also involves forming a prescribed intermediate layer by epitaxial growth between the first cell layer and the substrate. The separating step involves removing the substrate by etching and further removing the intermediate layer. The step of adhering the third cell layer to the first electrode includes forming a transparent conductive film on a surface of the third cell, and adhering the third cell to the first electrode by a transparent conductive adhesive.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The pn-junction layers include a first pn-junction layer of III-V or I-III-V group compound having a first band gap and formed on the first electrode; and a second pn-junction layer of a III-III-V group compound having a second band gap higher than the first band gap and formed on the first pn-junction layer; and third pn-junction layer of a III-III-V group compound having a third band gap higher than the second band gap and formed on the second pn-junction layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: The pn-junction layers include a first pn-junction layer of III-V or I-III-V group compound having a first band gap and formed on the first electrode; and a second pn-junction layer of a III-III-V group compound having a second band gap higher than the first band gap and formed on the first pn-junction layer; and third pn-junction layer of a III-III-V group compound having a third band gap higher than the second band gap and formed on the second pn-junction layer.