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| Keywords: ExampleOfBulkPhotovoltaicEffect.svg en An example of a simple system that would exhibit the bulk photovoltaic effect There are two electronic levels per unit cell separated by a large energy gap say 3eV The blue arrows indicate radiative transitions i e an electron can absorb a UV photon to go from A to B or it can emit a UV photon to go from B to A The purple arrows indicate nonradiative transitions i e an electron can go from B to C by emitting many phonons or can go from C to B by absorbing many phonons When light is shining an electron will occasionally move right by absorbing a photon and going from A to B to C However it will almost never move in the reverse direction C to B to A because the transition from C to B requires an improbably large thermal fluctuation Therefore there is a net rightward photocurrent 2014-01-03 13 33 29 own Sbyrnes321 cc-zero Uploaded with UploadWizard Photovoltaics Semiconductor physics Semiconductor band diagrams | ||||
