Performance of Hydrogenated a-Si:H Solar Cells with Downshifting Coating: Preprint

Research output: Contribution to conferencePaper


We apply a thin luminescent downshifting (LDS) coating to a hydrogenated amorphous Si (a-Si:H) solar cell and study the mechanism of possible current enhancement. The conversion material used in this study converts wavelengths below 400 nm to a narrow line around 615 nm. This material is coated on the front of the glass of the a-Si:H solar cell with a glass/TCO/p/i/n/Ag superstrate configuration.The initial efficiency of the solar cell without the LDS coating is above 9.0 % with open circuit voltage of 0.84 V. Typically, the spectral response below 400 nm of an a-Si:H solar cell is weaker than that at 615 nm. By converting ultraviolet (UV) light to red light, the solar cell will receive more red photons; therefore, solar cell performance is expected to improve. We observe evidence ofdownshifting in reflectance spectra. The cell Jsc decreases by 0.13 mA/cm2, and loss mechanisms are identified.
Original languageAmerican English
Number of pages7
StatePublished - 2011
Event2011 Materials Research Society Spring Meeting - San Francisco, California
Duration: 25 Apr 201129 Apr 2011


Conference2011 Materials Research Society Spring Meeting
CitySan Francisco, California

NREL Publication Number

  • NREL/CP-5200-51824


  • a-si:h
  • downshifting
  • LDS
  • silicon
  • solar cells


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