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Thermal Annealing Effect on P3HT:PCBM Free Polarons Lifetime and Charge Transport

  • Kejia Li (a1), Yang Shen (a1), Lijun Li (a1), Petr Khlyabich (a2), Ellen S. Reifler (a1), Barry C. Thompson (a2) and Joe C. Campbell (a1)...

Abstract

A transient response technique has been employed to investigate the lifetime of free polarons in bulk heterojunction blends of regioregular poly (3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61 butyric acid methylester (PCBM) at different annealing temperatures. Device efficiency and charge mobility were also measured. The longest lifetime, ∼ 1.5 microseceonds, was achieved for an annealing temperature of 140˚C; this represents a 2.5 x increase in lifetime relative to unannealed samples. The 140˚C annealing temperature also yields the highest efficiency. These measurements provide an estimate of the mobility-lifetime product, a figure of merit for charge transport in organic bulk heterojunctions.

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