Abstract
We studied charge injection and transport mechanisms in blends of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methylester (PCBM), by analysing dark, temperature dependent current-voltage characteristics of the P3HT:PCBM blend thin films sandwiched between aluminium electrodes in a metal/insulator/metal (MIM) configuration. We show that by applying appropriate electric fields, it is possible to switch from electron-only conduction to hole-only conduction in a single Al/P3HT:PCBM/Al device and present a general method of interpreting Fowler-Nordheim plots of MIM devices with pronounced non-linear characteristics by dividing them into several regions based on physical origins. We affirm that electrons can be selectively transported through the lowest unoccupied molecular orbital of PCBM at low applied voltages and low temperatures; and alternatively holes can be transported through the highest occupied molecular orbital of P3HT at higher applied voltages and high temperature, within a single device.
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