Tunable Polaronic Conduction in Anatase TiO2

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Dispiro-oxepine/thiapine derivatives for optoelectronic semiconductors

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Kasparas Rakstys

The dispiro-oxepine/dispiro-thiapine derivatives for optoelectronic semiconductors is a compound based on a structure having a functionalized dispiro compound of formula (Ia) or (Ib) with the core unit being a seven-membered heterocycle oxepine or thiapine ...

2018

Giant multiphoton absorption for THz resonances in silicon hydrogenic donors

Gabriel Aeppli, Le Nguyen Hoang

The absorption of multiple photons when there is no resonant intermediate state is a well-known nonlinear process in atomic vapours, dyes and semiconductors. The N-photon absorption (NPA) rate for donors in semiconductors scales proportionally from hydroge ...

Nature Publishing Group2018

Long-lived Photo-Charges in 1D Helical Organic Semiconductor Nanostructures

Regina Judith Hafner

The formation of photoexcited states in organic semiconductors, their separation into long-lived or stable charge carriers, as well as the charge transport are critical processes relevant to several important research fields and emerging technologies. Whil ...

EPFL2018

Dynamics of Electronic and Ionic Charges in Cyanine Organic Semiconductor Devices

Sandra Christina Jenatsch

Organic semiconductor materials have been widely applied in optoelectronic devices to replace their inorganic counterparts and explore new fields of applications. Due to their high extinction coefficients, chemical tunability and solubility, cyanine dyes a ...

EPFL2017

Gate-tunable black phosphorus spin valve with nanosecond spin lifetimes

Ahmet Avsar

Two-dimensional materials offer new opportunities for both fundamental science and technological applications, by exploiting the electron's spin. Although graphene is very promising for spin communication due to its extraordinary electron mobility, the lac ...

Nature Publishing Group2017

Interfacial Electron Injection Probed by a Substrate-Specific Excitonic Signature

Majed Chergui, Edoardo Baldini, Enrico Pomarico, Malte Oppermann, Gerald Auböck, Thomas Charles Henry Rossi, Tania Palmieri

Ultrafast interfacial electron transfer in sensitized solar cells has mostly been probed by visible-to-terahertz radiation, which is sensitive to the free carriers in the conduction band of the semiconductor substrate. Here, we demonstrate the use of deep- ...

2017

Engineering of supramolecular self-assembly in solution-processed organic semiconductors

Xavier Adrian Jeanbourquin

Organic semiconductors have recently emerged as a promising alternative to standard inorganic semiconductors for many commercial applications. Their ability to be processed from solution combined with their unique mechanical resistance paves the way for lo ...

EPFL2017

Incorporation of Counter Ions in Organic Molecules: New Strategy in Developing Dopant-Free Hole Transport Materials for Efficient Mixed-Ion Perovskite Solar Cells

Ulf Anders Hagfeldt, Nikolaos Vlachopoulos, Lin Yang

Hole transport matertial (HTM) as charge selective layer in perovskite solar cells (PSCs) plays an important role in achieving high power conversion efficiency (PCE). It is known that the dopants and additives are necessary in the HTM in order to improve t ...

Wiley-V C H Verlag Gmbh2017

Disentangling bulk and surface Rashba effects in ferroelectric alpha-GeTe

Jan Hugo Dil, Stefan Peter Muff

Macroscopic ferroelectric order in alpha-GeTe with its noncentrosymmetric lattice structure leads to a giant Rashba spin splitting in the bulk bands due to strong spin-orbit interaction. Direct measurements of the bulk band structure using soft x-ray angle ...

Amer Physical Soc2016