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http://hdl.handle.net/1942/9767
Title: | Role of electron-hole pair formation in organic magnetoresistance | Authors: | Majumdar, Sayani Majumdar, Himadri S. Aarnio, Harri VANDERZANDE, Dirk Laiho, Reino Osterbacka, Ronald |
Issue Date: | 2009 | Publisher: | AMER PHYSICAL SOC | Source: | PHYSICAL REVIEW B, 79(20) | Abstract: | Magnetoelectrical measurements were performed on diodes and bulk heterojunction solar cell blends (BHSCs) to clarify the role of formation of Coulombically bound electron-hole (e-h) pairs on the magnetoresistance (MR) response in organic thin-film devices. BHSCs are suitable model systems because they effectively quench excitons but the probability of forming e-h pairs in them can be tuned over orders of magnitude by the choice of material and solvent in the blend. We have systematically varied the e-h recombination coefficients, which are directly proportional to the probability for the charge carriers to meet in space, and found that a reduced probability of electrons and holes meeting in space lead to the disappearance of the MR. Our results clearly show that MR is a direct consequence of the e-h pair formation. We also found that the MR line shape follows a power-law dependence of B-0.5 at higher fields. | Notes: | [Majumdar, Sayani; Majumdar, Himadri S.; Aarnio, Harri; Osterbacka, Ronald] Abo Akad Univ, Dept Phys, SF-20500 Turku, Finland. [Majumdar, Sayani; Majumdar, Himadri S.; Aarnio, Harri; Osterbacka, Ronald] Abo Akad Univ, CoE Funct Mat, SF-20500 Turku, Finland. [Majumdar, Sayani; Laiho, Reino] Univ Turku, Wihuri Phys Lab, Turku 20014, Finland. [Vanderzande, Dirk] Univ Hasselt, Div Chem, Inst Mat Res, B-3590 Diepenbeek, Belgium. | Keywords: | electron-hole recombination; magnetoresistance; magnetoresistive devices; organic light emitting diodes; radiation quenching; solar cells; thin film devices; tuning | Document URI: | http://hdl.handle.net/1942/9767 | ISSN: | 1098-0121 | DOI: | 10.1103/PhysRevB.79.201202 | ISI #: | 000266501500008 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2010 |
Appears in Collections: | Research publications |
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