NREL Determines Long-Lived Carriers and Differences in CdTe Superstrate and Substrate Cells (Fact Sheet)

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NREL study may provide future guidance in improving CdS/CdTe photovoltaic device performance. The majority of minority carrier lifetime (MCL) studies performed on CdS/CdTe photovoltaic (PV) devices have correlated device performance primarily with the fast decay observed in time-resolved photoluminescence (TRPL) measurements (t{sub 1}). This decay is believed to be associated primarily with recombination in depletion width (W{sub D}), and therefore should be a good indicator of device quality if carrier generation occurs primarily within WD. However, although previous studies have shown that t1 can be a good indicator of broad device quality, it does not correlate as well with small ... continued below

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Creator: Unknown. February 1, 2012.

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NREL study may provide future guidance in improving CdS/CdTe photovoltaic device performance. The majority of minority carrier lifetime (MCL) studies performed on CdS/CdTe photovoltaic (PV) devices have correlated device performance primarily with the fast decay observed in time-resolved photoluminescence (TRPL) measurements (t{sub 1}). This decay is believed to be associated primarily with recombination in depletion width (W{sub D}), and therefore should be a good indicator of device quality if carrier generation occurs primarily within WD. However, although previous studies have shown that t1 can be a good indicator of broad device quality, it does not correlate as well with small changes in device performance and/or with differences observed between superstrate and substrate devices. Researchers at the National Renewable Energy Laboratory (NREL) have shown that in this case, the parameter t{sub 2} (from the longer-term decay of TRPL) may not only provide a better correlation with device open-circuit voltage (V{sub OC}) for superstrate devices but may also provide guidance for inter-comparison with alternative device designs (e.g., substrate devices). It is also suggested that previous studies may yield added value if a larger number of TRPL parameters (i.e., t{sub 1}, t{sub 2}, and respective amplitudes) are re-examined as a function of device performance. The parameter t{sub 2} may not only provide a better correlation with device VOC for superstrate devices but may also provide guidance for inter-comparison with alternative device designs (e.g., substrate devices).

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1 pg.

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  • Related Information: NREL Highlights, Science, NREL (National Renewable Energy Laboratory)

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  • Report No.: NREL/FS-5200-53083
  • Grant Number: AC36-08GO28308
  • DOI: 10.2172/1036371 | External Link
  • Office of Scientific & Technical Information Report Number: 1036371
  • Archival Resource Key: ark:/67531/metadc835062

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  • February 1, 2012

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  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 4:18 p.m.

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NREL Determines Long-Lived Carriers and Differences in CdTe Superstrate and Substrate Cells (Fact Sheet), report, February 1, 2012; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc835062/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.