Quentin Jeangros

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Interfacial engineering of the meso-TiO2 surface through a modified sequential deposition procedure involving a novel PbI2-HMPA complex pretreatment is conducted as a reproducible method for preparing MAPbI3 based perovskite solar cells providing the highest efficiencies yet reported with the polymer HTM layer. Grazing-incidence X-ray diffraction depth(More)
The use of passivating contacts compatible with typical homojunction thermal processes is one of the most promising approaches to realizing high-efficiency silicon solar cells. In this work, we investigate an alternative rear-passivating contact targeting facile implementation to industrial p-type solar cells. The contact structure consists of a chemically(More)
Esteban Rucavado,1 Quentin Jeangros,1,2 Daniel F. Urban,3 Jakub Holovský,4,5 Zdenek Remes,4,5 Martial Duchamp,6 Federica Landucci,1,7 Rafal E. Dunin-Borkowski,6 Wolfgang Körner,3 Christian Elsässer,3,8 Aïcha Hessler-Wyser,1 Monica Morales-Masis,1 and Christophe Ballif1 1École Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT),(More)
The study of light trapping in amorphous, microcrystalline and micromorph thin-film Si solar cells is an important and active field of investigation. It has been demonstrated that the use of a rough Ag back-reflector lead to an increase of short circuit current but also to losses through the creation of surface plasmon polaritons. Here, we use transmission(More)
Silicon heterojunction solar cells typically use stacks of hydrogenated intrinsic/doped amorphous silicon layers as carrier selective contacts. However, the use of these layers may cause parasitic optical absorption losses and moderate fill factor (FF) values due to a high contact resistivity. In this study, we show that the replacement of doped amorphous(More)
Articles you may be interested in Room-temperature remote-plasma sputtering of c-axis oriented zinc oxide thin films Improved conductivity of aluminum-doped ZnO: The effect of hydrogen diffusion from a hydrogenated amorphous silicon capping layer Deposition of aluminum-doped zinc oxide thin films for optical applications using rf and dc magnetron sputter(More)
The ability to obtain three-dimensional (3-D) information about morphologies of nanostructures elucidates many interesting properties of materials in both physical and biological sciences. Here we demonstrate a novel method in scanning transmission electron microscopy (STEM) that gives a fast and reliable assessment of the 3-D configuration of curvilinear(More)
Energy-filtered transmission electron microscopy images are acquired during the reduction of a NiO-YSZ composite in H2 up to 600 °C. Temperature-resolved quantitative information about both chemistry and structure is extracted with nm spatial resolution from the data, paving the way for the development of detailed reduction models.
J. Bullock, M. Tosun, M. Hettick, Dr. C. M. Sutter-Fella, Prof. A. Javey Department of Electrical Engineering and Computer Sciences University of California Berkeley, CA 94720, USA E-mail: ajavey@berkeley.edu J. Bullock, M. Tosun, M. Hettick, Dr. C. M. Sutter-Fella, Prof. A. Javey Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley,(More)
Changes in the nanostructure of methylammonium lead iodide (MAPbI3) perovskite solar cells are assessed as a function of current-voltage stimulus by biasing thin samples in situ in a transmission electron microscope. Various degradation pathways are identified both in situ and ex situ, predominantly at the positively biased MAPbI3 interface. Iodide migrates(More)