title: Long Lifetime Hole Traps at Grain Boundaries in CdTe Thin-Film Photovoltaics.
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.
authors.affiliation: Deptartment of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom.
authors.forename: B G
authors.initials: BG
authors.lastname: Mendis
authors.affiliation: Attolight AG, EPFL Innovation Square, Building D, 1015 Lausanne, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Gachet
authors.affiliation: Stephenson Institute for Renewable Energy, University of Liverpool, Chadwick Building, Liverpool L69 7ZF, United Kingdom.
authors.forename: J D
authors.initials: JD
authors.lastname: Major
authors.affiliation: Stephenson Institute for Renewable Energy, University of Liverpool, Chadwick Building, Liverpool L69 7ZF, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Durose