Recombination pathways in polymer:fullerene photovoltaics observed through spin polarization measurements

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

DOI:https://doi.org/10.1063/1.4865203· OSTI ID:22283161

Etherington, Marc K.; Wang, Jianpu; Chow, Philip C. Y.

We report magnetoconductance measurements on polymer:fullerene photovoltaic devices in the regime of high fields and low temperatures, where spin polarization of injected carriers plays an important role. The current either decreases or increases with magnetic field, depending on whether the interfacial charge-transfer state lies above or below the intramolecular triplet state in energy. Rapid transitions from triplet charge-transfer states to lower-lying triplet excitons constitute an important loss mechanism that is responsible for the negative magnetoconductance observed.

• OSTI ID: 22283161
• Journal Information: Applied Physics Letters, Vol. 104, Issue 6; Other Information: (c) 2014 Author(s); 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
CHARGE CARRIERS
ELECTRIC CURRENTS
EXCITONS
FULLERENES
INTERFACES
MAGNETIC FIELDS
MAGNETORESISTANCE
PHOTOCONDUCTIVITY
PHOTOVOLTAIC EFFECT
POLYMERS
RECOMBINATION
SPIN ORIENTATION
TRIPLETS