Investigating the Role of Copper in Arsenic Doped Cd(Se,Te) Photovoltaics

Eric Colegrove, Brian Good, Ali Abbas, Helio Moutinho, Steve Johnston, Chun-Sheng Jiang, Patrick O'Keefe, John Walls, David Albin, Matthew Reese

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations


The open circuit voltage (VOC) deficit in Cd(Se,Te)-based photovoltaics remains a critical obstacle for pushing the technology closer to theoretical performance limits. Arsenic doping has become a dominant and promising route to achieve the higher p-type carrier concentrations necessary for higher VOC, but challenges associated with this alternate defect chemistry and higher doping density have hindered progress. Here we show that while arsenic doping enables high carrier concentrations (>1016 cm−3), co-doping with copper can provide a boost to VOC without a significant change to carrier concentration. A large data set is initially used to explore current-voltage and capacitance-voltage trends associated with arsenic doped devices with and without copper. A smaller subset is then used to probe these trends using a wide variety of characterization techniques. Copper is found to facilitate reduced interface recombination and potentially improved bulk absorber characteristics, though the mechanisms for these improvements are not yet clear. Despite the improved performance of co-doped devices, VOC is still far below its potential especially for highly doped devices. Low emitter doping in conjunction with high absorber doping seems to be a plausible cause for this significant deficit, though other device properties may exacerbate this problem.

Original languageAmerican English
Article numberArticle No. 111886
Number of pages12
JournalSolar Energy Materials and Solar Cells
StatePublished - 1 Oct 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5K00-82785


  • Cd(Se,Te)
  • Group V doping
  • Open circuit voltage
  • Simulation


Dive into the research topics of 'Investigating the Role of Copper in Arsenic Doped Cd(Se,Te) Photovoltaics'. Together they form a unique fingerprint.

Cite this