Making a Copper-Oxide Photodetector from Scratch
A recent demonstration shows how to create a functional copper-oxide photodetector at home using only copper and a heat source. The process involves heating copper in a salt water cell to form a Cu2O semiconductor layer that can detect light. While DIY versions are simple, recent research highlights the material's potential for high-sensitivity sensors and gas detection applications.
- ▪A Cu2O photodetector can be constructed at home by heating one electrode of a salt water cell until a copper oxide layer forms.
- ▪The resulting crude sensor produces enough current to function in a simple light detection circuit.
- ▪Copper-oxide photodetectors are gaining research interest due to their narrow 1.2 eV bandgap.
- ▪Recent studies indicate that optimized grain structures can significantly improve the sensitivity and response time of these sensors.
- ▪Research from 2024 demonstrates that copper-oxide sensors can also be utilized for gas detection purposes.
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Making A Copper-Oxide Photodetector From Scratch No comments by: Maya Posch September 20, 2026 Title: Copy Short Link: Copy Photodetectors come in a wide variety of constructions and materials, with the Cu2O-based photodetector that [Mad Scientist Creations] demonstrates in a recent video being a good example of a photodetector that can be created at home using nothing but some copper and a heat source. Of the two copper elements in a salt water cell, one element is heated to the point where a copper oxide layer forms, specifically Cu2O, which acts as a semiconductor and provides the photosensitive layer. Even a fairly crude sensor created with a regular gas stove produces enough of a current that it can be used in a simple light detection circuit.
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