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Publications associées (364)

Synthesis of Amphiphilic Ru-II Heteroleptic Complexes Based on Benzo[1,2-b:4,5-b]dithiophene: Relevance of the Half-Sandwich Complex Intermediate and Solvent Compatibility

Michael Graetzel, Mohammad Khaja Nazeeruddin

The detailed synthesis and characterization of four ruthenium(II) complexes [RuLL(NCS)(2)] is reported, in which L represents a 2,2-bipyridine ligand functionalized at the 4,4 positions with benzo[1,2-b:4,5-b]dithiophene derivatives (BDT) and L is 2,2-bipy ...

Wiley-Blackwell2015

Facile preparation of micron- and nano-scale textured master for nano-imprinting front electrode in thin-film silicon tandem cells with improved light trapping

Christophe Ballif, Franz-Josef Haug, Etienne Antoine Julien Moulin, Jinhua Huang

This paper reports a facile method to prepare a textured surface with combined micron- and nano-scale surface features, which is used as master for nano-imprinting process to obtain transparent front electrodes in thin-film silicon tandem cells. The micron ...

Elsevier2015

Sputtered rear electrode with broadband transparency for perovskite solar cells

Christophe Ballif, Arnaud Walter, Stefaan De Wolf, Sylvain Nicolay, Björn Niesen, Monica Morales Masis, Soo-Jin Moon, Jérémie Werner, Philipp Friedrich Hermann Löper, Guy Joseph Günter Dubuis

Due to their high efficiencies combined with simple and cost-effective device fabrication, perovskite solar cells are promising candidates as top cells in tandem devices. For this application, the perovskite solar cell must be highly transparent at near-in ...

Elsevier2015

CH3NH3PbI3 perovskite/silicon tandem solar cells: characterization based optical simulations

Christophe Ballif, Stefaan De Wolf, Björn Niesen

In this study we analyze and discuss the optical properties of various tandem architectures: mechanically stacked (four-terminal) and monolithically integrated (two-terminal) tandem devices, consisting of a methyl ammonium lead triiodide (CH3NH3PbI3) perov ...

Optical Society of America2015

Partially gated lateral tunnel field effect transistor for optical applications

Mihai Adrian Ionescu, Nilay Dagtekin

Silicon-based partially gated tunnel FETs are characterized under optical and electrical excitation. Most significant outcomes of the experiments are (1) unique characteristics, namely, light induced negative transconductance and optically tunable output r ...

Amer Inst Physics2014

Perovskite Solar Cells Based on Nanocolumnar PlasmaDeposited ZnO Thin Films

Michael Graetzel, Mohammad Khaja Nazeeruddin, Francisco Javier Ramos Mellado

ZnO thin films having a nanocolumnar microstructure are grown by plasma-enhanced chemical vapor deposition at 423 K on pre-treated fluorine-doped tin oxide (FTO) substrates. The films consist of c-axis-oriented wurtzite ZnO nanocolumns with well-defined mi ...

Wiley-Blackwell2014

Silicon Heterojunction Solar Cells With Copper-Plated Grid Electrodes: Status and Comparison With Silver Thick-Film Techniques

Christophe Ballif, Quentin Thomas Jeangros, Antoine Descoeudres, Antonin Faes, Jonas Geissbühler, Nicolas Badel, Matthieu Despeisse, Stefaan De Wolf, Loris Barraud, Andrea Tomasi

Copper electroplating is investigated and compared with common silver printing techniques for the front metallization of silicon heterojunction solar cells. We achieve smaller feature sizes by electroplating, significantly reducing optical shadowing losses ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Lead-Free Halide Perovskite Solar Cells with High Photocurrents Realized Through Vacancy Modulation

Michael Graetzel, Nripan Mathews

Lead free perovskite solar cells based on a CsSnI3 light absorber with a spectral response from 950 nm is demonstrated. The high photocurrents noted in the system are a consequence of SnF2 addition which reduces defect concentrations and hence the backgrou ...

Wiley-V C H Verlag Gmbh2014

Two-electron photo-oxidation of betanin on titanium dioxide and potential for improved dye-sensitized solar energy conversion

Jacques-Edouard Moser, Arianna Marchioro

The plant pigment betanin is investigated as a dye-sensitizer on TiO2 with regard to its potential to undergo two- electron oxidation following one-photon excitation. Electrochemical, spectroelectrochemical and transient absorption measurements provide evi ...

SPIE2014

Two-electron photo-oxidation of betanin on titanium dioxide and potential for improved dye-sensitized solar energy conversion

Jacques-Edouard Moser, Arianna Marchioro

The plant pigment betanin is investigated as a dye-sensitizer on TiO2 with regard to its potential to undergo two-electron oxidation following one-photon excitation. Electrochemical, spectroelectrochemical and transient absorption measurements provide evid ...

SPIE-INT SOC OPTICAL ENGINEERING2014

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