THIN FILM SOLAR CELL, SEMICONDUCTOR THIN FILM AND COATING LIQUID FOR FORMING SEMICONDUCTOR

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The present invention provides a thin film solar cell which can exhibit high photoelectric conversion efficiency. The present invention aims to provide a semiconductor thin film intended to be used in the thin film solar cell and to a coating liquid for forming a semiconductor which can facilitate large-area production of the thin film solar cell to improve production stability. The present invention relates to a thin film solar cell including a photoelectric conversion layer. The photoelectric conversion layer includes a portion that includes a sulfide of a group 15 element of the periodic table and/or a selenide of a group 15 element of the periodic table and a compound containing at least one element selected from the group consisting of a rare earth element, titanium, and zinc.