Performance Improvements in Conjugated Polymer Devices by Removal of Water-Induced Traps
Nielsen, Christian B.
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/668764
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AbstractThe exploration of a wide range of molecular structures has led to the development of high-performance conjugated polymer semiconductors for flexible electronic applications including displays, sensors, and logic circuits. Nevertheless, many conjugated polymer field-effect transistors (OFETs) exhibit nonideal device characteristics and device instabilities rendering them unfit for industrial applications. These often do not originate in the material's intrinsic molecular structure, but rather in external trap states caused by chemical impurities or environmental species such as water. Here, a highly efficient mechanism is demonstrated for the removal of water-induced traps that are omnipresent in conjugated polymer devices even when processed in inert environments; the underlying mechanism is shown, by which small-molecular additives with water-binding nitrile groups or alternatively water–solvent azeotropes are capable of removing water-induced traps leading to a significant improvement in OFET performance. It is also shown how certain polymer structures containing strong hydrogen accepting groups will suffer from poor performances due to their high susceptibility to interact with water molecules; this allows the design guidelines for a next generation of stable, high-performing conjugated polymers to be set forth.
CitationNikolka, M., Schweicher, G., Armitage, J., Nasrallah, I., Jellett, C., Guo, Z., … Sirringhaus, H. (2018). Performance Improvements in Conjugated Polymer Devices by Removal of Water-Induced Traps. Advanced Materials, 30(36), 1801874. doi:10.1002/adma.201801874
SponsorsThe authors gratefully acknowledge financial support the Physical Sciences Research Council though a Programme Grant (EP/M005141/1). M.N. acknowledges financial support from the European Commission through a Marie-Curie Individual Fellowship. G.S. acknowledges postdoctoral fellowship support from the Wiener-Anspach Foundation and The Leverhulme Trust (Early Career Fellowship supported by the Isaac Newton Trust).
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Nikolka, M., Schweicher, G., Armitage, J., Jellett, C., Guo, Z., Hurhangee, M., Sadhanala, A., McCulloch, I., Nielsen, C. B., & Sirringhaus, H. (2018). Performance Improvements in Conjugated Polymer [Data set]. Apollo - University of Cambridge Repository. https://doi.org/10.17863/CAM.24907. DOI: 10.17863/cam.24907 Handle: 10754/668780