Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.70: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Tailored thermoelectric efficiencies by controlling disorder — •Stefan Jakobs1, Felix Lange1, and Matthias Wuttig1,2 — 1I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany — 2JARA - Fundamentals of Future Information Technology, RWTH Aachen University, Germany
Thermoelectric materials require high complexity in material tailoring since both electrical and thermal transport properties play a significant role for their energy conversion efficiency.
A relatively high electrical conductivity as well as a low thermal conductivity is described by the phonon glass-electron crystal (PGEC) concept.
One approach is the concerted variation of stoichiometry (e.g. doping) to enhance the power factor or embedding ’rattling atoms’ to reduce the lattice thermal conductivity.
Another approach is the controlled use of disorder. Sittner et al. have shown recently that disorder in pseudo-binary (GeTe)x(Sb2Te3)1−x phase-change materials (PCM) can be tuned to obtain moderate thermoelectric efficiencies up to zT = 0.7 at 120 ∘C[1].
Here we explore the potential of concerted doping of pseudo-binary PCM with SnTe to further enhance thermoelectric properties.
[1] E.-R. Sittner et al., Phys Status Solidi A, 210 (2013)