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Silicon micro venturi nozzles for cost-efficient spray coating of thin organic P3HT/PCBM layers

Betz, Michael A; Büchele, Patric; Brünnler, Manfred; Deml, Sonja; Lechner, Alfred

Abstract:
Improvements on spray coating are of particular interest to different fields of technology as it is a scalable deposition method and processing from solutions offer various application possibilities outside of typical facilities. When it comes to the deposition of expensive and film-forming media such as organic semiconductors, consumption and nozzle cleaning issues are of particular importance. We demonstrate the simple steps to design and fabricate micro venturi nozzles for economical spray coating with a consumption as low as 30-50 µl centerdot min$^{-1}$. For spray coating an active area of 25 cm$^{2}$ a 2.45-4.01 fold coating efficiency is observed compared to a conventional airbrush nozzle set. The electrical characterization of first diodes sprayed with an active layer thickness of ~750 nm using a single micronozzle at a coating speed of 1.7 cm2 centerdot min−1 reveals a good external quantum efficiency of 72.9% at 532 nm and a dark current of ~7.4 centerdot 10$^{-5}$ mA centerdot cm$^{-2}$, both measured at  −2 V. Furthermore, the high resistance of the micronozzles against solvents and most acids is provided through realiza ... mehr


Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1088/0960-1317/27/1/015019
ISSN: 0960-1317, 1361-6439
KITopen ID: 1000062633
HGF-Programm 43.23.04; LK 01
Erschienen in Journal of micromechanics and microengineering
Band 27
Heft 1
Seiten Art. Nr. 015019
Bemerkung zur Veröffentlichung http://iopscience.iop.org/article/10.1088/0960-1317/27/1/015019
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