TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: A single connection point is provided. At least one of the two layers exhibit an aperture and at least two layers thereby exhibit e.g. differences with regard to the number, the arrangement and/or the size of the apertures. At least one electrically conductive layer comprises at least one metal and/or at least one electrically non-conductive layer comprises at least a polymer. At least one electrically conductive layer comprises continuous electrically conductive surfaces, which are separated by separating regions. The multi-layer back contact film comprises at least three additional electrically non-conductive layers. The multi-layer back contact film is a separate part. The multilayer back contact film from below to above comprises an additional electrically non-conductive layer, an electrically conductive layer, an electrically non-conductive layer with apertures, an electrically conductive layer with apertures, a further additional electrically non-conductive layer made of a resist layer, or an epoxide resin layer and a further additional electrically non-conductive layer with apertures. The upper/uppermost additional electrically non-conductive layer exhibits e.g. more apertures than the underlying layers, and preferably e.g. both apertures, which are not arranged opposite to the apertures of the directly underlying electrically conductive layer, and apertures, which are arranged opposite to the apertures of the directly underlying electrically conductive layer. The upper/uppermost conductive layer in comparison to the directly underlying electrically non-conductive layer comprises e.g. the same number of apertures. The apertures of the upper/uppermost electrically conductive layer, e.g. are larger than the apertures of the above and below lying electrically non conductive layers with apertures, where these apertures e.g. both are arranged against at least a part of the apertures of the directly above lying electrically non-conductive layer and against at least a part of the apertures of the underlying non-electrically conductive layers. The lowermost electrically conductive layer comprises two quadratic and continuous electrically conductive surfaces, whose size corresponds roughly to the size of the used solar cell. The remaining continuous electrically conductive surfaces of the two electrically conductive layers are rectangular and preferably at least partially extend over the surface covered by two solar cell surface. The continuous electrically conductive surfaces, which extend preferably at least partially over the surface covered by two solar cells and which belong to an electrically conductive layer, stretches at least partially under and/or over two continuous electrically conductive surfaces of the respective additional electrically conductive layers. At least two electrically conductive layers of the multi-layer back contact film respectively are directly connected with at least a part of the back contact of each solar cell. The back contact, which represent the positive pole or the negative pole of the solar cell are respectively each connected with a first/upper/uppermost electrically conductive layer and a second/lower/lowermost electrically conductive layer. The back contact, which represent the positive pole or the negative pole of at least one additional solar cell, which is at least connected with the first solar cell in series, respectively are connected with the second/lower/lowest electrically conductive layer and the first/upper/uppermost electrically conductive layer. The respective electrically conductive layer is connected with the back contact, which represents the positive pole of the solar cell, and at least one additional electrically conductive layer is connected with the back contact, which represent the negative terminal of the solar cell. At least one group of at least two solar cells is connected in series over at least two electrically conductive layers of the multi-layer back contact film. At least one, preferably at least two groups of solar cells, which are connected in series over at least two electrically conductive layers of the multilayer back contact film, are connected with the connection point.