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|Title: ||Role of electron-hole pair formation in organic magnetoresistance|
|Authors: ||Majumdar, Sayani|
Majumdar, Himadri S.
|Issue Date: ||2009|
|Publisher: ||AMER PHYSICAL SOC|
|Citation: ||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.|
|ISI #: ||000266501500008|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2010|
|Appears in Collections: ||Research publications|
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