Analysis of Solar Cell Quality Using Voltage Metrics: Preprint

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The highest efficiency solar cells provide both excellent voltage and current. Of these, the open-circuit voltage (Voc) is more frequently viewed as an indicator of the material quality. However, since the Voc also depends on the band gap of the material, the difference between the band gap and the Voc is a better metric for comparing material quality of unlike materials. To take this one step further, since Voc also depends on the shape of the absorption edge, we propose to use the ultimate metric: the difference between the measured Voc and the Voc calculated from the external quantum efficiency ... continued below

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6 p.

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Toberer, E. S.; Tamboli, A. C.; Steiner, M. & Kurtz, S. June 1, 2012.

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The highest efficiency solar cells provide both excellent voltage and current. Of these, the open-circuit voltage (Voc) is more frequently viewed as an indicator of the material quality. However, since the Voc also depends on the band gap of the material, the difference between the band gap and the Voc is a better metric for comparing material quality of unlike materials. To take this one step further, since Voc also depends on the shape of the absorption edge, we propose to use the ultimate metric: the difference between the measured Voc and the Voc calculated from the external quantum efficiency using a detailed balance approach. This metric is less sensitive to changes in cell design and definition of band gap. The paper defines how to implement this metric and demonstrates how it can be useful in tracking improvements in Voc, especially as Voc approaches its theoretical maximum.

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6 p.

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  • Presented at the 2012 IEEE Photovoltaic Specialists Conference, 3-8 June 2012, Austin, Texas

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  • Report No.: NREL/CP-5200-54120
  • Grant Number: AC36-08GO28308
  • Office of Scientific & Technical Information Report Number: 1044445
  • Archival Resource Key: ark:/67531/metadc837719

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  • June 1, 2012

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  • May 19, 2016, 9:45 a.m.

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  • April 6, 2017, 12:49 p.m.

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Toberer, E. S.; Tamboli, A. C.; Steiner, M. & Kurtz, S. Analysis of Solar Cell Quality Using Voltage Metrics: Preprint, article, June 1, 2012; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc837719/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.