Controlling Polarity of Organic Bulk Heterojunction
Field-Effect Transistors via Solvent Additives
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Abstract
The
effect of additives such as 1,8-diiodooctane (DIO) and 1-chloronaphthalene
(CN) on the electronic structures, charge transport and phase separation
of small-molecule-based bulk heterojunction (BHJ) films was investigated.
Charge transport properties of the BHJ layers significantly changed
via the introduction of additives, even though the molecular energy
levels remained unchanged. X-ray photoelectron microscopy (XPM) images
show the distribution of each phase of the blend films upon the use
of additives. The CN additive, in particular, results in a well-percolated
network through the active layer