Publications de Hui Zhang | EPFL Graph Search

Lead immobilization for environmentally sustainable perovskite solar cells

Michael Graetzel, Antonio Abate, Hui Zhang

Lead halide perovskites are promising semiconducting materials for solar energy harvesting. However, the presence of heavy-metal lead ions is problematic when considering potential harmful leakage into the environment from broken cells and also from a publ ...

NATURE PORTFOLIO2023

All-in-One Deposition to Synergistically Manipulate Perovskite Growth for High-Performance Solar Cell

Frank Nüesch, Jie Wu, Wei Huang, Hui Zhang

Nonradiative recombination losses originating from crystallographic distortions and issues occurring upon interface formation are detrimental for the photovoltaic performance of perovskite solar cells. Herein, we incorporated a series of carbamide molecule ...

2020

Cyanine tandem and triple-junction solar cells

Frank Nüesch, Roland Hany, Björn Niesen, Lei Wang, René Uwe Schneider, Hui Zhang

Ultrathin bilayer heterojunction solar cells using cyanine electron donors and electron acceptor C-60 are used to fabricate monolithically stacked tandem and triple junction devices. Sub-cell stack sequences as well as C-60 layer thicknesses are optimized ...

Elsevier2016

MLL1 Inhibition Reprograms Epiblast Stem Cells to Naive Pluripotency

Lulu Liu, Hacer Karatas, Hui Zhang, Bo Zhou

Cell Press2016

Accelerated Microstructure Imaging via Convex Optimization (AMICO) from diffusion MRI data

Jean-Philippe Thiran, Alessandro Daducci, Erick Jorge Canales Rodriguez, Tim Bjørn Dyrby, Hui Zhang

Microstructure imaging from diffusion magnetic resonance (MR) data represents an invaluable tool to study non-invasively the morphology of tissues and to provide a biological insight into their microstructural organization. In recent years, a variety of bi ...

Elsevier2015

NIR sensitive organic dyes for tandem solar cells and transparent photodiodes

Hui Zhang

Due to advantages such as mechanical flexibility, light weight and the prospect to use low-cost roll-to-roll manufacturing processes, organic semiconductors have been widely investi-gated in many application areas as alternatives for their inorganic counte ...

EPFL2015

Assessing white matter microstructure of the newborn with multi-shell diffusion MRI and biophysical compartment models

Nicolas Kunz, Kieran O'Brien, François Lazeyras, Hui Zhang

Brain white matter connections have become a focus of major interest with important maturational processes occurring in newborns. To study the complex microstructural developmental changes in-vivo, it is imperative that non-invasive neuroimaging approaches ...

Elsevier2014

Cyanine dye polyelectrolytes for organic bilayer solar cells

Roland Hany, Lei Wang, Hui Zhang

Polyelectrolytes composed of an anionic sulfoethyl methacrylate/methacrylate backbone and cationic cyanine dyes counter ions are synthesized. The effective reaction sequence is confirmed by NMR spectroscopy and consists of a thermal radical copolymerizatio ...

Elsevier Sci Ltd2014

Influence of crystalline titanium oxide layer smoothness on the performance of inverted organic bilayer solar cells

Roland Hany, Gaëtan Wicht, Hui Zhang, Thomas Andreas Lanz

Due to the small exciton diffusion length in organic materials, the donor-acceptor heterointerface in simple bilayer solar cells must be placed in close proximity to the bottom electrode. This makes great demands on the planarity of the base layer, since a ...

Amer Inst Physics2013

Stability of bilayer trimethine cyanine dye/fullerene organic solar cells

Roland Hany, Lei Wang, Gaëtan Wicht, Hui Zhang

The long-term (up to 100 days) stabilities of thin films of a trimethine cyanine dye (Cy3-P) and of Cy3-P/C-60 bilayer solar cells with initial power conversion efficiencies of up to 3.6% in the regular and inverted device architecture were studied. For st ...

Elsevier Science Bv2013