Abstract
Blend phase composition governs electron trapping in insulator:semiconducting polymer mixtures used in organic light-emitting diodes.
Highlights
Over half a decade ago Mark and Helfrich proposed a theory describing trap-limited electron transport in crystalline organic semiconductors in the space-charge-limited regime.[1]
Many examples exist in literature where details on phase dynamics and morphology of semiconducting and electroactive blends provide for an a posteriori explanation of electronic phenomena observed on the device level.[7,8,9,10,11,12]
We commence with calculating the ternary phase diagrams for the methoxy-5-(20-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV):PS: chlorobenzene blends using Flory–Huggins theory.[5]
Summary
Over half a decade ago Mark and Helfrich proposed a theory describing trap-limited electron transport in crystalline organic semiconductors in the space-charge-limited regime.[1]. Using Flory–Huggins theory we show that the blend’s calculated phase diagram represents a qualitative but effective means to predict whether the electron current in the dry blend material would increase upon mixing due to dilution.
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