RIR-MAPLE deposition of conjugated polymers for application to optoelectronic devices |
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Authors: | Ryan Pate Ryan McCormick Li Chen Weidong Zhou Adrienne D Stiff-Roberts |
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Institution: | (1) Molecular Materials and Nanosystems, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; |
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Abstract: | Resonant-infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) is a promising deposition technology for the fabrication
of conjugated polymer-based optoelectronic devices for two primary reasons: (i) the ability to control film morphology, and
(ii) the ability to deposit multi-layered heterostructures. This article reviews a variation of RIR-MAPLE that uses emulsified
targets of organic solvents and water such that the incident laser wavelength (Er:YAG at 2.9 μm) is resonant with hydroxyl
(O–H) bonds in the host matrix, which are absent from the guest material. The novelty of the approach lies in the fact that
while most polymers of interest and many compatible solvents do not resonantly absorb the laser energy at 2.9 μm, the emulsion
with water enables high-quality, thin-film deposition with minimal photochemical and structural degradation for almost any
polymer of interest. In addition, the advantages of emulsion-based RIR-MAPLE for conjugated polymer-based optoelectronic devices
are demonstrated by two important studies. First, conjugated polymer films deposited by RIR-MAPLE are shown to have higher
hole drift mobilities than films deposited using traditional drop-casting and spin-casting techniques. Second, the unique
capability of RIR-MAPLE to enable conjugated polymer-based optical heterostructures is demonstrated by the fabrication and
characterization of a multi-layer, polymer distributed Bragg reflector. |
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