55.9 MB (1.8 MB compressed)
4302 x 4545 pixels
36.3 x 38.6 cm ⏐ 14.3 x 15.2 in (300dpi)
MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Solar cell (image 1 of 3). Computer illustration of the structure of a solar cell. Solar cells convert sunlight into electricity. This cell consists of 2 layers of silicon (Si, upper & lower left). The top layer also contains phosphorous (P) atoms. Atoms are seen as purple spheres. There are 5 outer electrons (e-, blue) around a P atom and 4 around a Si atom. Sunlight on the top layer releases e- whose places around the P atom are taken by e- from the bottom layer. The e- build-up in the top layer can be discharged as an electric current. For the solar cell charging and discharg- ing see images T155/109 and T155/110 respectively.
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