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Hong Zhang

Cette personne n’est plus à l’EPFL

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Publications associées (37)

Nanoscale interfacial engineering enables highly stable and efficient perovskite photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mounir Driss Mensi, Ursula Röthlisberger, Ulf Anders Hagfeldt, Sandy Sanchez Alonso, Mathias Dankl, Hong Zhang, Anurag Krishna, Olivier Ouellette

We present a facile molecular-level interface engineering strategy to augment the long-term operational and thermal stability of perovskite solar cells (PSCs) by tailoring the interface between the perovskite and hole transporting layer (HTL) with a multif ...

2021

Carrier Transport Layer-Free Perovskite Solar Cells

Liang Wang, Hong Zhang, Chunyang Zhang

Power conversion efficiencies (PCEs) of up to 25.5 % have been reported for perovskite solar cells (PSCs). Thus, they have shown great potential for commercial applications. Therefore, simplifying technological process and reducing production costs have be ...

WILEY-V C H VERLAG GMBH2021

Orientation‐Engineered Small‐Molecule Semiconductors as Dopant‐Free Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells

Michael Graetzel, Miao Chen, Hong Zhang, Zhiwen Zhou

Crystallized p-type small-molecule semiconductors have great potential as efficient and stable hole transporting materials (HTMs) for perovskite solar cells (PSCs) due to their relatively high hole mobility, good stability and tunable HOMOs depending on th ...

2021

Crown Ether Modulation Enables over 23% Efficient Formamidinium-Based Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mounir Driss Mensi, Ursula Röthlisberger, Ulf Anders Hagfeldt, Jun Ho Yum, Kevin Sivula, Marko Mladenovic, David Lyndon Emsley, Farzaneh Jahanbakhshi, Jovana Milic, Dan Ren, Aditya Mishra, Felix Thomas Eickemeyer, Hong Zhang, Michael Allan Hope, Jun Li, Anurag Krishna, Olivier Ouellette, Zhiwen Zhou

The use of molecular modulators to reduce the defect density at the surface and grain boundaries of perovskite materials has been demonstrated to be an effective approach to enhance the photovoltaic performance and device stability of perovskite solar cell ...

2020

Stabilization of Highly Efficient and Stable Phase-Pure FAPbI(3)Perovskite Solar Cells by Molecularly Tailored 2D-Overlayers

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Mohammad Ibrahim Dar, Jiyoun Seo, Yuhang Liu, Seckin Akin, Jiahuan Zhang, Felix Thomas Eickemeyer, Hong Zhang, Hongwei Zhu

As a result of their attractive optoelectronic properties, metal halide APbI(3)perovskites employing formamidinium (FA(+)) as the A cation are the focus of research. The superior chemical and thermal stability of FA(+)cations makes alpha-FAPbI(3)more suita ...

Wiley-VCH Verlag GmbH2020

Perovskite Photovoltaics: The Significant Role of Ligands in Film Formation, Passivation, and Stability

Mohammad Khaja Nazeeruddin, Tom Theodorus Antonius Lummen, Hong Zhang

Due to their outstanding optoelectronic properties, metal halide perovskites have been intensively studied in recent years. The latest certificated efficiency of 23.3% recently achieved in perovskite solar cells (PVSCs) enables them to be used as a very pr ...

Wiley2019

Selective C-C Coupling in Carbon Dioxide Electroreduction via Efficient Spillover of Intermediates As Supported by Operando Raman Spectroscopy

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jingshan Luo, Dan Ren, Jing Gao, Hong Zhang

Developing efficient systems for the conversion of carbon dioxide to valuable chemicals using solar power is critical for mitigating climate change and ascertaining the worlds future supply of clean fuels. Here, we introduce a mesoscopic cathode consisting ...

AMER CHEMICAL SOC2019

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

Tailoring Triple-Anion Perovskite Material for Indoor Light Harvesting with Restrained Halide Segregation and Record High Efficiency Beyond 36%

Fangzhou Liu, Hong Zhang, Zhiwen Zhou

Indoor photovoltaics are promising to enable self-powered electronic devices for the Internet of Things. Here, reported is a triple-anion CH3NH3PbI2-xBrClx perovskite film, of which the bandgap is specially designed for indoor light harvesting to achieve a ...

2019

Highly efficient planar perovskite solar cells achieved by simultaneous defect engineering and formation kinetic control

Mohammad Khaja Nazeeruddin, Hong Zhang, Shunlin Zhang

The formation of high quality (good morphology and low defect concentrations) perovskite films is crucial for realizing high-performance perovskite solar cells (PVSCs). Low-temperature processed perovskite films tend to have a high density of defect states ...

Royal Society of Chemistry2018

Improving the stability and performance of perovskite solar cells via off-the-shelf post-device ligand treatment

Yuhang Liu, Jovana Milic, Hong Zhang

2018

Room temperature formation of organic-inorganic lead halide perovskites: design of nanostructured and highly reactive intermediates

Michael Graetzel, Dan Li, Hong Zhang

Recently, organic-inorganic lead halide perovskites have been intensively studied for use in solar cells because of their low cost and high performance. Most of the efficient perovskite solar cells (PVSCs) need layer-dependent high-temperature treatment fo ...

Royal Society of Chemistry2017

Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition)

Nicolas Dupont, Françoise Gisou van der Goot Grunberg, Li Jin, Lionel Blanc, Andreas Kern, Andreas Mayer, Yin Chen, Darren Moore, Maurizio Molinari, Xu Liu, Jun Ren, Ziwei Qu, Li Yu, Xin Qi, Paolo Paganetti, Wei Chen, Peiwen Chen, Jian Zhang, Hong Jiang, Bo Wang, Yi Sun, Rakesh Kumar, Qi Chen, Si Chen, Ke Liu, Feng Xu, Qing Zhong, Hua Bai, Yang Sun, Sheng Li, Wei Liu, Peng Wang, Zhen Yan, Bo Liu, Fan Zhang, Jian Wu, Jian Wang, Li Zhang, Chih-Peng Chang, Giuseppe Russo, Sandra Moreno, Ying Jiang, Hong Zhang, Liang Xu, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

A Smooth CH3NH3PbI3 Film via a New Approach for Forming the PbI2 Nanostructure Together with Strategically High CH3NH3I Concentration for High Efficient Planar-Heterojunction Solar Cells

Michael Graetzel, Di Zhang, Hong Zhang, Hongwei Zhu

The photovoltaic performance of perovskite solar cells (PVSCs) is extremely dependent on the morphology and crystallization of the perovskite film, which is affected by the deposition method. In this work, a new approach is demonstrated for forming the PbI ...

Wiley-VCH Verlag Berlin2015

From marine plants to photovoltaic devices

Michael Graetzel, Liang Wang, Hong Zhang, Ning Wang

We demonstrated that extracts from sea tangle can serve as a sensitizer, redox couple, as well as a counter electrode material, or even can be fabricated into an "all-natural solar cell". Especially, the carbon counter electrode from sea tangle has achieve ...

Royal Society of Chemistry2014