Determination of carrier lifetime and mobility in colloidal quantum dot films via impedance spectroscopy

Journal Article · Mon Feb 10 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4865089· OSTI ID:22283181

Rath, Arup K.; Lasanta, Tania; Bernechea, Maria; Diedenhofen, Silke L.; Konstantatos, Gerasimos ^[1]

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1. ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Castelldefels, Barcelona 08860 (Spain)

Impedance Spectroscopy (IS) proves to be a powerful tool for the determination of carrier lifetime and majority carrier mobility in colloidal quantum dot films. We employ IS to determine the carrier lifetime in PbS quantum dot Schottky solar cells with Al and we verify the validity of the technique via transient photovoltage. We also present a simple approach based on an RC model that allows the determination of carrier mobility in PbS quantum dot films and we corroborate the results via comparison with space charge limited measurements. In summary, we demonstrate the potential of IS to characterize key-to-photovoltaics optoelectronic properties, carrier lifetime, and mobility, in a facile way.

• OSTI ID: 22283181
• Journal Information: Applied Physics Letters, Vol. 104, Issue 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
CARRIER LIFETIME
CARRIER MOBILITY
COLLOIDS
COMPARATIVE EVALUATIONS
IMPEDANCE
LEAD SULFIDES
PHOTOVOLTAIC EFFECT
QUANTUM DOTS
SOLAR CELLS
SPACE CHARGE
SPECTROSCOPY
THIN FILMS
TRANSIENTS