Integrated structure of CIS based solar cell

An integrated structure of a CIS based thin film solar cell obtained by stacking a p-type CIS light absorbing layer, a buffer layer, and an n-type transparent conductive film in that order,

• wherein the buffer layer has a stack structure of three or more layers,
• a first buffer layer adjoining the p-type light absorbing layer is made of a compound containing cadmium (Cd), zinc (Zn), or indium (In),
• a second buffer layer adjoining the first buffer layer is made of a zinc oxide-based thin film,
• a third buffer layer is formed to cover
• end faces exposed by forming an interconnect pattern in the p-type CIS light absorbing layer, the first buffer layer, and the second buffer layer, and
• an end face to the n-type transparent conductive film and the second buffer layer, and
• the third buffer layer is made of a zinc oxide-based thin film having a high resistivity of 0.1 to 100 Ωcm.