Exeger's Powerfoyle®: headphones, e-readers and other devices will recharge themselves from ambient light, even indoors

https://www.exeger.com/news/swedish-solar-technology-innovators-henrik-lindstrom-and-giovanni-fili-receive-european-inventor-award-2021-in-the-smes-category/ 

"thin, flexible dye-sensitised solar cell that harvests electricity extremely efficiently and can be custom-printed in almost any texture, shape or colour... electrode is located directly behind the light absorbing layer. This means that more light reaches the cell, and more electrical current is generated... screen printing was chosen as the ideal manufacturing method... European Patent Office (EPO) honours Swedish inventors"

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https://www.ucl.ac.uk/news/2025/aug/new-solar-cells-could-power-devices-indoor-light