SOLAR CELL, MULTIJUNCTION SOLAR CELL, SOLAR CELL MODULE, PHOTOVOLTAIC POWER GENERATION SYSTEM, AND METHOD FOR PRODUCING SOLAR CELL

摘要

Embodiments provide a solar cell, a multijunction solar cell, a solar cell module, a photovoltaic power generation system, and a method for producing solar cell whose solar cells are wide band gap type and have improved efficiency. A solar cell of an embodiment includes a first electrode, a light absorbing layer containing at least Cu, In, Ga, and Se, an n-type layer, and a second electrode. The light absorbing layer exists between the first electrode and the n-type layer. The n-type layer exists between the light absorbing layer and the second electrode. In the light absorbing layer, a proportion occupied by elements of Cu, Ga, and Se is 80 atom% or more. A Ga concentration in a whole of the light absorbing layer is higher than an In concentration in the whole of the light absorbing layer. An In concentration in a region on the n-type layer's side of the light absorbing layer is higher than a Ga concentration in the region on the n-type layer's side of the light absorbing layer.