Publications related to Molecular-scale interface engineering of TiO2 nanocrystals: Improving the efficiency and stability of dye-sensitized solar cells

Related publications (24)

Cuprous oxide-Shewanella mediated photolytic hydrogen evolution

Michael Graetzel, Christos Comninellis, Kevin Sivula, Nikolaos Vlachopoulos, Linfeng Pan, Meng Xia, Michele Morgante

However, its green production process is expensive, involving water electrolysis, which requires a significant amount of energy. New technologies have been developed to decrease the cost associated with water electrolysis, such as using microbial electroly ...

2025

Bulk and surface modified polycrystalline CuWO4 films for photoelectrochemical water oxidation

Jinhyun Kim

Polycrystalline CuWO4 film is an emerging photoanode material for photoelectrochemical (PEC) water splitting with a small bandgap to absorb visible light and excellent stability in a neutral electrolyte. However, its PEC performance is quite low mainly due ...

Pergamon-Elsevier Science Ltd2023

Bifunctional additive 2-amino-3-hydroxypyridine for stable and high-efficiency tin-lead perovskite solar cells

Mohammad Khaja Nazeeruddin, Yi Zhang, Keith Gregory Brooks, Bing Zhang

Tin-lead (Sn-Pb) mixed perovskite has received widespread attention due to its suitable band gap width and high optical absorption coefficients. However, the power conversion efficiency (PCE) of Sn-Pb mixed perovskite solar cells (PSCs) is still low due to ...

Royal Society of Chemistry2022

Enhanced Solar-to-Fuel Efficiency of Ceria-Based Thermochemical Cycles via Integrated Electrochemical Oxygen Pumping

Sophia Haussener, Meng Lin, Clemens Gregor Suter

The solar thermochemical cycle based on ceria is a promising route for renewable fuel production. The solar-to-fuel efficiency of a thermochemical reactor is highly dependent on the oxygen removal during the reduction step. Conventional nitrogen sweeping ( ...

AMER CHEMICAL SOC2022

Crystalline Order in Compound Semiconductors in Nanoscale Structures and Thin Films

Mahdi Zamani

Semiconductors materials and devices are essential building blocks for many of the technologies deeply embedded in modern life. Improving the performance of semiconductor devices requires a deeper understanding of the fundamental mechanisms controlling the ...

EPFL2021

Novel Interfacial Characterization and Surface Engineering in Semiconductor Electrodes for Optimized Solar Fuel Production

Yongpeng Liu

Harvesting sunlight, the ultimate renewable power source, in a cost-effective way has been long recognized as a necessary route to meet the global energy challenges. Solar energy can be transformed into electricity by means of photovoltaic devices to suppl ...

EPFL2021

Efficient stable graphene-based perovskite solar cells with high flexibility in device assembling via modular architecture design

Michael Graetzel, Shaik Mohammed Zakeeruddin, Hong Zhang, Chunyang Zhang

Carbon-based perovskite solar cells (C-PSCs) are emerging as low-cost stable photovoltaics. However, their power conversion efficiency (PCE) still lags behind that of devices based on Au or Ag as the current collector. Here, we introduced an innovative mod ...

2019

Insights about the Absence of Rb Cation from the 3D Perovskite Lattice: Effect on the Structural, Morphological, and Photophysical Properties and Photovoltaic Performance

Silvia Binet, Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Neha Arora, Gwénolé Jean Jacopin, Ryusuke Uchida

Efficiencies >20% are obtained from the perovskite solar cells (PSCs) employing Cs+ and Rb+ based perovskite compositions; therefore, it is important to understand the effect of these inorganic cations specifically Rb+ on the properties of perovskite struc ...

WILEY-V C H VERLAG GMBH2018

Photoluminescent, upconversion luminescent and nonlinear optical metal-organic frameworks: From fundamental photophysics to potential applications

Kyriakos Stylianou, Ngoc Tú Nguyên, Fatmah Ebrahim

Metal-organic frameworks (MOFs) are a class of porous materials prepared by the self-assembly of metal ions or clusters with organic ligands. The unique characteristics of MOFs, including structural tunability, high surface areas, low densities and tailore ...

2018

Raising the one-sun conversion efficiency of III-V/Si solar cells to 32.8% for two junctions and 35.9% for three junctions

Christophe Ballif, Matthieu Despeisse, Antoine Descoeudres, Loris Barraud, Stephanie Essig

Today's dominant photovoltaic technologies rely on single-junction devices, which are approaching their practical efficiency limit of 25-27%. Therefore, researchers are increasingly turning to multi-junction devices, which consist of two or more stacked su ...

Nature Publishing Group2017

Probing interfacial energetics and charge transfer kinetics in semiconductor nanocomposites: New insights into heterostructured TiO2/BiVO4 photoanodes

Raffaella Buonsanti, Anna Loiudice

Heterostructured nanocomposites offer promise for creating systems exhibiting functional properties that exceed those of the isolated components. For solar energy conversion, such combinations of semiconducting nanomaterials can be used to direct charge tr ...

Elsevier Science Bv2017

Unbroken Perovskite: Interplay of Morphology, Electro-optical Properties, and Ionic Movement

Michael Graetzel, Ulf Anders Hagfeldt, Wolfgang Richard Tress, Michael Saliba, Antonio Abate, Juan-Pablo Correa-Baena, Konrad Domanski, Tor Jesper Jacobsson

Hybrid organic-inorganic perovskite materials have risen up as leading components for light-harvesting applications. However, to date many questions are still open concerning the operation of perovskite solar cells (PSCs). A systematic analysis of the inte ...

Wiley-V C H Verlag Gmbh2016

Low-temperature, solution-deposited metal chalcogenide films as highly efficient counter electrodes for sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Bing Zhang

Transition metal chalcogenide crystalline films FeSe2, Cu1.8S, and CuSe have been deposited from solution by drop casting their dissolved inks onto a conductive substrate, followed by a mild thermal treatment. We demonstrate that the resulting chalcogenide ...

Royal Society of Chemistry2015

Synthesis of highly effective Pt/carbon fiber composite counter electrode catalyst for dye-sensitized solar cells

Ulf Anders Hagfeldt

Pt/carbon fiber composite (Pt/Cf) with a low Pt loading of 1.0 wt% is introduced into dye-sensitized solar cells as counter electrode (CE) catalyst. The cobalt-electrolyte based device using this composite CE achieves power conversion efficiency of 8.97%, ...

Elsevier2015

Coupling light into thin silicon layers for high-efficiency solar cells

Karin Söderström

Thin-film solar cells based on amorphous and microcrystalline silicon require thin photoactive layers to ensure a satisfactory collection of the photogenerated carriers. The small thickness is advantageous in terms of raw material consumption and industria ...

EPFL2013

Layers with advanced optoelectronic properties for high-efficiency micromorph solar cells on opaque substrates

Rémi Biron

EPFL2013

Molecular-Scale Interface Engineering of Nanocrystalline Titania by Co-adsorbents for Solar Energy Conversion

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Mingkui Wang, Péter Kalman Péchy

The use of mixed self-assembled monolayers, combining hydrophobic co-adsorbents with the sensitizer, has been demonstrated to enhance the efficiency of dye-sensitized solar cells (DSCs). Herein, the influence of the anchoring groups of the co-adsorbents on ...

2012

High-rate deposition of microcrystalline silicon in a large-area PECVD reactor and integration in tandem solar cells

Christophe Ballif, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon

We study the high-rate deposition of microcrystalline silicon in a large-area plasma-enhanced chemical-vapor-deposition (PECVD) reactor operated at 40.68 MHz, in the little-explored process conditions of high-pressure and high-silane concentration and depl ...

2010

Facile preparation of large aspect ratio ellipsoidal anatase TiO2 nanoparticles and their application to dye-sensitized solar cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

A simple one-step heat-treatment of peroxotitanate complex aqueous solution at around 100 degrees C was resulted in the formation of ellipsoidal anatase TiO2 nanoparticles having a high aspect ratio with no branches. The length of these ellipsoidal TiO2 fa ...

Elsevier2009

Structure/Function Relationships in Dyes for Solar Energy Conversion: A Two-Atom Change in Dye Structure and the Mechanism for Its Effect on Cell Voltage

Shaik Mohammed Zakeeruddin

2009