Sign Inversion of Magnetoresistance in Space-Charge Limited Organic Devices
2009 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, no 6, 066601Article in journal (Refereed) Published
In this Letter, we explain the puzzling sign change of organic magnetoresistance in space-charge limited devices by device physics. We prove analytically and numerically that in the case of bipolar conduction with an Ohmic majority carrier and an injection limited minority carrier contact, a decrease in minority carrier mobility may give rise to an increase in the device current. It is shown that when the magnetic field acts to decrease the mobility of both carriers, a sign change in the magnetoconductivity as a function of applied bias may result. This behavior is in agreement with experimental observations.
Place, publisher, year, edition, pages
American Physical Society , 2009. Vol. 103, no 6, 066601
IdentifiersURN: urn:nbn:se:liu:diva-118183DOI: 10.1103/PhysRevLett.103.066601ISI: 000268809300049OAI: oai:DiVA.org:liu-118183DiVA: diva2:813514
Funding Agencies|Dutch Technology Foundation (STW)2015-05-222015-05-222015-06-01