Investigation of Sub-Bandgap Emission and Unexpected N-Type Behavior in Undoped Polycrystalline Cdsexte1-X

Research output: Contribution to journalArticlepeer-review

Abstract

Se alloying has enabled significantly higher carrier lifetimes and photocurrents in CdTe solar cells, but these benefits can be highly dependent on CdSexTe1-x processing. This work evaluates the optoelectronic, chemical, and electronic properties of thick (3 ..mu..m) undoped CdSexTe1-x of uniform composition and varied processing conditions (CdSexTe1-x evaporation rate, CdCl2 anneal, Se content) chosen to reflect various standard device processing conditions. Sub-bandgap defect emission is observed, which increased as Se content increased and with “GrV-optimized CdCl2” (i.e., CdCl2 anneal conditions used for group-V-doped devices). Low carrier lifetime is found for GrV-optimized CdCl2, slow CdSexTe1-x deposition, and low-Se films. Interestingly, all films (including CdTe control) exhibited n-type behavior, where electron density increased with Se up to an estimated ~1017 cm-3. This behavior appears to originate during the CdCl2 anneal, possibly from Se diffusion leading to anion vacancy (e.g., VSe, VTe) and ClTe generation.
Original languageAmerican English
JournalAdvanced Science
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5K00-85057

Keywords

  • CdSeTe
  • CdTe
  • chlorine
  • defects
  • group V
  • n-type
  • voltage loss

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