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Mendis BG, Gachet D, Major JD, et al. Long Lifetime Hole Traps at Grain Boundaries in CdTe Thin-Film Photovoltaics. Phys Rev Lett. 2015;115(21):218701doi: 10.1103/PhysRevLett.115.218701.
Mendis, B. G., Gachet, D., Major, J. D., & Durose, K. (2015). Long Lifetime Hole Traps at Grain Boundaries in CdTe Thin-Film Photovoltaics. Physical review letters, 115(21), 218701. https://doi.org/10.1103/PhysRevLett.115.218701
Mendis, B G, et al. "Long Lifetime Hole Traps at Grain Boundaries in CdTe Thin-Film Photovoltaics." Physical review letters vol. 115,21 (2015): 218701. doi: https://doi.org/10.1103/PhysRevLett.115.218701
Mendis BG, Gachet D, Major JD, Durose K. Long Lifetime Hole Traps at Grain Boundaries in CdTe Thin-Film Photovoltaics. Phys Rev Lett. 2015 Nov 20;115(21):218701. doi: 10.1103/PhysRevLett.115.218701. Epub 2015 Nov 18. PMID: 26636877.
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Phys Rev Lett. 2015 Nov 20;115(21):218701. doi: 10.1103/PhysRevLett.115.218701. Epub 2015 Nov 18.

Long Lifetime Hole Traps at Grain Boundaries in CdTe Thin-Film Photovoltaics.

Physical review letters

B G Mendis, D Gachet, J D Major, K Durose

Affiliations

  1. Deptartment of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom.
  2. Attolight AG, EPFL Innovation Square, Building D, 1015 Lausanne, Switzerland.
  3. Stephenson Institute for Renewable Energy, University of Liverpool, Chadwick Building, Liverpool L69 7ZF, United Kingdom.

PMID: 26636877 DOI: 10.1103/PhysRevLett.115.218701

Abstract

A novel time-resolved cathodoluminescence method, where a pulsed electron beam is generated via the photoelectric effect, is used to probe individual CdTe grain boundaries. Excitons have a short lifetime (≤100 ps) within the grains and are rapidly quenched at the grain boundary. However, a ~47 meV shallow acceptor, believed to be due to oxygen, can act as a long lifetime hole trap, even at the grain boundaries where their concentration is higher. This provides direct evidence supporting recent observations of hopping conduction across grain boundaries in highly doped CdTe at low temperature.

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