Publications de Klaus Leifer | EPFL Graph Search

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl) imide Ion in Coevaporated p-i-n Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Mounir Driss Mensi, Klaus Leifer, Cristina Roldán Carmona, Hiroyuki Kanda, Albertus Adrian Sutanto, Cansu Igci, Nadja Isabelle Desiree Klipfel, Keith Gregory Brooks

Hybrid lead halide perovskites have reached comparable efficiencies to state-of-the-art silicon solar cell technologies. However, a remaining key challenge toward commercialization is the resolution of the perovskite device instability. In this work, we id ...

2021

Coronene Fusion by Heat Treatment: Road to Nanographenes

Yury Tsybin, Klaus Leifer

The reactions of coronene dehydrogenation and fusion upon heat treatment in the temperature range of 500-700 degrees C were studied using XRD, TEM, Raman, IR, and NEXAFS spectroscopy. The formation of a coronene dimer (dicoronylene) was observed at tempera ...

American Chemical Society2011

Decomposition, diffusion, and growth rate anisotropies in self-limited profiles during metalorganic vapor-phase epitaxy of seeded nanostructures

Elyahou Kapon, Alok Rudra, Klaus Leifer

We present a model for the interplay between the fundamental phenomena responsible for the formation of nanostructures by metalorganic vapor phase epitaxy on patterned (001)/(111)B GaAs substrates. Experiments have demonstrated that V-groove quantum wires ...

2011

Mechanisms of Quantum Dot Energy Engineering by Metalorganic Vapor Phase Epitaxy on Patterned Nonplanar Substrates

Elyahou Kapon, Paolo De Los Rios, Benjamin Dwir, Klaus Leifer, Qing Zhu

A novel technique for tuning the strength of quantum confinement in site-controlled semiconductor quantum dots (QDs) is introduced and investigated theoretically and experimentally. The method makes use of controlled local growth rates during metalorganic ...

American Chemical Society2007

Klaus Leifer

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Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl) imide Ion in Coevaporated p-i-n Perovskite Solar Cells

Coronene Fusion by Heat Treatment: Road to Nanographenes

Decomposition, diffusion, and growth rate anisotropies in self-limited profiles during metalorganic vapor-phase epitaxy of seeded nanostructures

Mechanisms of Quantum Dot Energy Engineering by Metalorganic Vapor Phase Epitaxy on Patterned Nonplanar Substrates

Strongly reduced exciton transfer between quantum wires

Narrow (~4meV) inhomogeneous broadening and its correlation with confinement potential of pyramidal quantum dot arrays

Influence of long-range substrate roughness in V-groove quantum wire structures

Polarization-Resolved Optical Absorption in Single V-groove Quantum Wires

Alloy Segregation, Quantum Confinement and Carrier Capture in Self-Ordered Pyramidal Quantum Wires

Patterning of Confined-State Energies in Site-Controlled Semiconductor Quantum Dots

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl) imide Ion in Coevaporated p-i-n Perovskite Solar Cells

Coronene Fusion by Heat Treatment: Road to Nanographenes

Mechanisms of Quantum Dot Energy Engineering by Metalorganic Vapor Phase Epitaxy on Patterned Nonplanar Substrates

Strongly reduced exciton transfer between quantum wires

Influence of long-range substrate roughness in V-groove quantum wire structures

Polarization-Resolved Optical Absorption in Single V-groove Quantum Wires

Alloy Segregation, Quantum Confinement and Carrier Capture in Self-Ordered Pyramidal Quantum Wires

Patterning of Confined-State Energies in Site-Controlled Semiconductor Quantum Dots

Decomposition, diffusion, and growth rate anisotropies in self-limited profiles during metalorganic vapor-phase epitaxy of seeded nanostructures

Narrow (~4meV) inhomogeneous broadening and its correlation with confinement potential of pyramidal quantum dot arrays