Degradation of Photovoltaic Devices at High Concentration by Space Charge Limited Currents

Ari Feldman, Richard Ahrenkiel, John Lehman

Research output: Contribution to journalArticlepeer-review

4 Scopus Citations


High-injection mobility reduction is examined by theory, modeling, and experimental data acquired by resonance-coupled photoconductive decay (RCPCD). The ambipolar mobility is shown to reduce to zero when the constituent injection-dependent carrier mobilities are taken into account. Modeling of the photoconductivity incorporating the transient, injection-dependent, ambipolar mobility confirms experimental reduction in signal at increasing carrier-generation rates. The onset of the reduction of mobility occurs at approximately 10 times the background carrier density; thus devices that utilize lightly doped materials are susceptible to anomalous injection-based behavior. For photovoltaic applications, high-injection device-performance degradation would result from mobility reduction due to reduced diffusion length.

Original languageAmerican English
Pages (from-to)408-411
Number of pages4
JournalSolar Energy Materials and Solar Cells
StatePublished - 2013

NREL Publication Number

  • NREL/JA-5200-60326


  • Ambipolar mobility
  • Mobility
  • Photoconductive decay
  • Silicon
  • Solar cells


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