3D nanoarchitectures for energy- and bio-medical technologies - enhanced functionality through correlative microscopy and spectroscopy

Date

Dec 18, 2017

Time

10:00 AM - 11:00 AM

Speaker

Prof. Dr. Silke Christiansen

Affiliation

Helmholtz-Zentrum Berlin für Materialien und Energie

Series

IFW Kolloquium

Language

en

Main Topic

Materialien

Other Topics

Materialien, Physik

Host

Dr. Carola Langer

Description

The successful integration of 3D nano-architectures, with scale-bridging features from macro-to-nano, into devices such as sensors or light emitters and absorbers e.g. light emitting diodes (LEDs) or solarcells requires new approaches towards fabrication and characterization. The present paper will show the successful realization of device concepts relying on property controlled Si or GaN nanowires (NWs) or inverted, cone-shaped, 1D Si structures (SiNCs) which permit the concentration and confinement of visible (VIS) and near infrared (NIR) light e.g. in whispering gallery modes (WGMs). Fabrication concepts based on nano-lithography and dry etching and optical property optimization based on numerical simulations (finite difference time domain - FDTD) will be presented. Individual as well as ensembles of these 1D nano-structures will be integrated in pn-junction solar cells (all-inorganic or organic-inorganic hybrids) and optical sensors. Design rules for optimized absorption or light emission (VIS-NIR) will be derived. Moreover, novel carrier selective, nano-material based contacting schemes will be presented. Among those, composites containing silver nanowires and graphene are demonstrated. Materials and device characterization will rely on advanced correlated electron microscopy (EM) and spectroscopy (CORRMIC) including optical, electrical, structural and compositional techniques inside scanning EMs and x-ray microscopes (XRMs). The impact of statistical evaluation of heterogeneous CORRMIC data on materials and device optimization will be demonstrated.

Links

• Seminars at the IFW

Last modified: Dec 18, 2017, 8:44:46 AM