The movement "Fridays for Future" is a good indicator for students not only having a very strong interest in sustainability, but also a high motivation to actively discuss this topic. For this reason, it is important for schools to provide the necessary basic knowledge and to give students insight into current research and application within the realm of sustainability education and SDGs. In this article digital learning tools for the concept "Alternative Solar Cells with Titanium Dioxide" (ALSO-TiO 2) are presented, that can be used to implement the topic "Solar Cells" in regular chemistry classes. The concept bridges the gap between the galvanic cell as a compulsory subject and dye-sensitized solar cells (DSSC), also known as Grätzel-cells. Thus didactic experiments, so-called photogalvanic cells, are explored with the help of an e-book. In addition, a small eye-tracking study is presented which was carried out in order to develop a new edition of an interactive animation.

Sonnencremes enthalten eine Mischung organischer und anorganischer Filter, die eine möglichst große Bandbreite an UV‐Strahlung absorbieren. Wie das funktioniert, können Schüler mit einer UV‐Taschenlampe, einer Wärmebildkamera und Alltagsmaterialien wie Kunststofffolien oder Textmarkern erkunden. Eine Versuchsreihe nicht nur vor dem Freibadbesuch.

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Alternative solar cells on the basis of titanium dioxide are subject of intense research. For the integration of this topic into the chemistry curriculum a set of experiments with photogalvanic cells has been developed. Titania phototelectrodes need to be irradiated with UV light, but the spectrum of solar light contains only little UV radiation. Thus photosensitizers are needed that harvest visible light. Here we present a series of experiments with different dye solutions that can serve as an alternative to the priorly used anthocyanins in the chemistry classroom. The dyes presented are more stable and also work as sensitizers in titania-based photogalvanic cells.

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