MRS Spring Meeting 2011

Tavares, L. (Oplægsholder)

Aktivitet: Foredrag og mundtlige bidragKonferenceoplæg


Organic materials have been given much attention due to their intriguing properties that can be tailored via synthetic chemistry for specific applications combined with their low price and fairly straight-forward large-scale synthesis. For future nanoscale applications, self-assembled organic nanostructures are of particular interest and have been used to demonstrate e.g. electronic [1] and photonic [2] functionality. In order to fully exploit the special intrinsic properties of such nanostructures, they need to be transferred from their growth substrate to a device platform and integrated with the necessary circuitry to allow for example electrical biasing. This step is hindered by the fragile nature of such van-der-Waals bonded molecular crystals which makes such integration challenging. Here, we report a technique for transferring fragile para-hexaphenylene (p6P) nanofibers from their growth substrate to a device substrate without damaging their morphology and optical properties. p6P nanofibers were chosen to serve as a model system for these experiments due to their characteristic properties including highly polarized and efficient luminescence in the blue spectral range [3], which combined with electrical interfacing can enable a nanoscale, blue light source. We show how the device structure (bottom or top contacts and gate) influence the electrical characteristics of the nanofibers when directly transferred onto a field-effect transistor platform and how biasing the nanofiber transistor with a sinusoidal gate voltage can be used to obtain clear blue nanofiber electroluminescence. [1] Briseno, A. L. et al., Nano Lett. (2007) 7, 668 [2] O’Carrol, D. et al., Nat. Nanotechn. (2007) 2, 180 [3] Balzer, F. et al., Adv. Funct. Mater. (2005) 15, 17
Periode25. apr. 201130. apr. 2011
BegivenhedstitelMRS Spring Meeting 2011: null
PlaceringSan Francisco, USA