Field collapse due to band-tail charge in amorphous silicon solar cells

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It is common for the fill factor to decrease with increasing illumination intensity in hydrogenated amorphous silicon solar cells. This is especially critical for thicker solar cells, because the decrease is more severe than in thinner cells. Usually, the fill factor under uniformly absorbed red light changes much more than under strongly absorbed blue light. The cause of this is usually assumed to arise from space charge trapped in deep defect states. The authors model this behavior of solar cells using the Analysis of Microelectronic and Photonic Structures (AMPS) simulation program. The simulation shows that the decrease in fill factor ... continued below

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6 p.

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Wang, Qi; Crandall, R.S. & Schiff, E.A. May 1, 1996.

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It is common for the fill factor to decrease with increasing illumination intensity in hydrogenated amorphous silicon solar cells. This is especially critical for thicker solar cells, because the decrease is more severe than in thinner cells. Usually, the fill factor under uniformly absorbed red light changes much more than under strongly absorbed blue light. The cause of this is usually assumed to arise from space charge trapped in deep defect states. The authors model this behavior of solar cells using the Analysis of Microelectronic and Photonic Structures (AMPS) simulation program. The simulation shows that the decrease in fill factor is caused by photogenerated space charge trapped in the band-tail states rather than in defects. This charge screens the applied field, reducing the internal field. Owing to its lower drift mobility, the space charge due to holes exceeds that due to electrons and is the main cause of the field screening. The space charge in midgap states is small compared with that in the tails and can be ignored under normal solar-cell operating conditions. Experimentally, the authors measured the photocapacitance as a means to probe the collapsed field. They also explored the light intensity dependence of photocapacitance and explain the decrease of FF with the increasing light intensity.

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6 p.

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OSTI as DE96007873

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  • 25. photovoltaic solar energy conference, Washington, DC (United States), 13-17 May 1996

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  • Other: DE96007873
  • Report No.: NREL/TP--451-20441
  • Report No.: CONF-960513--6
  • Grant Number: AC36-83CH10093
  • Office of Scientific & Technical Information Report Number: 238528
  • Archival Resource Key: ark:/67531/metadc668581

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • March 28, 2016, 3:08 p.m.

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Wang, Qi; Crandall, R.S. & Schiff, E.A. Field collapse due to band-tail charge in amorphous silicon solar cells, article, May 1, 1996; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc668581/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.