| 11. | Light striking the sensitiser excites electrons which are absorbed by the titania to become an electric current.
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| 12. | This means that there are more excited electrons than electrons in the lowest energy state in the system.
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| 13. | This absorption happens when two atoms collide with each other while one of them has an excited electron.
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| 14. | The wavefunction of the bound state is said to be " effective masses of the excited electron and hole.
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| 15. | When sunlight ( photons ) strike PV cells, they excite electrons and allow them to flow, creating an electric current.
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| 16. | The excited electron and hole can recombine and release the energy gained from the excitation of the electron as heat.
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| 17. | After some time delay, a second, higher energy pulse photoemits the excited electron into free electron states above the vacuum level.
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| 18. | The first one corresponds to the superconducting ground state and the next to the thermally excited electrons from the ground state.
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| 19. | Furthermore, the excited electron is quantum entangled to another electron so it is simultaneously in both the singlet and triplet states.
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| 20. | As electron releases energy ( e . g . phonon ) it interacts with another excited electron to release its energy too.
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