Metal electrode effects on spin-orbital coupling and magnetoresistance in organic semiconductor devices

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This letter reports the modifications of spin-orbital coupling and magnetoresistance of conjugated polymer upon deposition of metal electrode based on organic light-emitting diodes of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene]. We find that the reverse bias yields a largely increased magnetoresistance when the electron-hole capture zone is away from the metal electrode as compared to the forward bias with the electron-hole capture zone close to the metal electrode. The electroluminescence suggests that the deposited metal atoms enhance the spin-orbital coupling at the polymer/metal interface and consequently lead to electron-hole capture zone dependent magnetic field effects in organic semiconductor devices.