Publications by Michael Graetzel

Unlocking high-performance photocapacitors for edge computing in low-light environments

Driving continuous, low-power artificial intelligence (AI) in the Internet of Things (IoT) requires reliable energy harvesting and storage under indoor or low-light conditions, where batteries face constraints such as finite lifetimes and increased environ ...

2025

Enhancing Indoor Photovoltaic Eﬃciency to 37.6% Through Triple Passivation Reassembly and n-Type to p-Type Modulation in Wide Bandgap Perovskites

Michael Graetzel, Lukas Pfeifer

Despite well‐matching indoor illumination spectra, the performance of wide bandgap perovskite solar cells (WB‐PSCs) for indoor photovoltaics (i‐PV) is hindered by photo‐induced halide phase segregation and trap‐assisted non‐radiative recombination. Herein, ...

Wiley2025

Synergistic Electron-Deficient Surface Engineering: A Key Factor in Dictating Electron Carrier Extraction for Perovskite Photovoltaics

Michael Graetzel

Work function modulation of transparent conductive oxides via self-assembled monolayers (SAMs) facilitates efficient hole or electron extraction in optoelectronic devices. However, recent SAMs for perovskite solar cells (PSCs) diverge from traditional inte ...

American Chemical Society (ACS)2025

Electrolyte effects and stability of Zn/Li dual-ion batteries with water-in-salt electrolytes

Michael Graetzel, Ladislav Kavan, Felix Thomas Eickemeyer

Aqueous zinc-ion batteries have emerged as promising candidates for safe and cost-effective energy storage, yet their performance remains constrained by electrode stability and electrolyte composition. In this study, we investigate the electrochemical beha ...

2025

Aryl-Acetylene Layered Hybrid Perovskites in Photovoltaics

Christophe Ballif, Aïcha Hessler-Wyser, Michael Graetzel, Ursula Röthlisberger, Mostafa Rabie Shlaly Bahr Othman, Masaud Hassan S Almalki, Fatemeh Ansari, Felix Thomas Eickemeyer, Lukas Pfeifer, Christian Michael Wolff, Nikolaos Lempesis, Virginia Carnevali

Metal halide perovskites have shown exceptional potential in converting solar energy to electric power in photovoltaics, yet their application is hampered by limited operational stability. This stimulated the development of hybrid layered (two-dimensional, ...

WILEY-V C H VERLAG GMBH2025

Spiro-Phenothiazine Hole-Transporting Materials: Unlocking Stability and Scalability in Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jaeki Jeong, Likai Zheng

Improving both the efficiency and long-term stability of perovskite solar cells (PSCs) is critical for their commercial deployment. Despite the widespread use of spiro-OMeTAD as a hole-transporting material (HTM), its inhomogeneous doping behavior and susc ...

2025

All-perovskite tandem solar cells achieving >29% efficiency with improved (100) orientation in wide-bandgap perovskites

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Nikolaos Lempesis, Mingyang Wei, Virginia Carnevali, Lorenzo Agosta

Monolithic all-perovskite tandem solar cells present a promising approach for exceeding the efficiency limit of single-junction solar cells. However, the substantial open-circuit voltage loss in the wide-bandgap perovskite subcell hinders further improveme ...

NATURE PORTFOLIO2025

Unraveling the Role of Electron-Withdrawing Molecules for Highly Efficient and Stable Perovskite Photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mingyang Wei, Likai Zheng

Electron-withdrawing molecules (EWMs) have exhibited remarkable efficacy in boosting the performance of perovskite solar cells (PSCs). However, the underneath mechanisms governing their positive attributes remain inadequately understood. Herein, we conduct ...

Wiley-VCH Verlag GmbH2025

Realizing Uniform Defect Passivation via Self‐Polymerization of Benzenesulfonate Molecules in Perovskite Photovoltaics

Michael Graetzel, Mingyang Wei, Likai Zheng, Xiaoqing Jiang

Realizing high‐quality perovskite films through uniform defect passivation and crystallization control is pivotal to unlocking the potential of scalable applications. However, prevalent small‐molecule additives are inherently susceptible to the crystalliza ...

Wiley2025

Solar photons beyond the band gap wavelengths: their effect on solution-processed solar cells

Michael Graetzel

A deep understanding of how solution-processed solar cells (SSCs) perform under varying temperatures and irradiance is crucial for their optimal design, synthesis, and use. However, current partial spectral characterization, primarily below the band gap wa ...

2025

Aryl‐Acetylen‐Schichthybrid‐Perowskite in der Photovoltaik

Michael Graetzel, Ursula Röthlisberger, Masaud Hassan S Almalki, Fatemeh Ansari, Felix Thomas Eickemeyer, Lukas Pfeifer, Nikolaos Lempesis, Virginia Carnevali

Metallhalogenid‐Perowskite haben ein außerordentliches Potenzial für die Umwandlung von Sonnenenergie in elektrische Energie in der Photovoltaik gezeigt, doch ihre Anwendung wird durch eine begrenzte Betriebsstabilität behindert. Dies hat die Entwicklung h ...

Wiley2025

Computational Insights Into Organic Halide Perovskite Solar Devices Incorporating Electroactive Interlayers

Michael Graetzel, Ursula Röthlisberger, Virginia Carnevali

FUNDACIO DE LA COMUNITAT VALENCIANA SCITO2025

Polyaniline-supported copper nanocrystals for electrochemical CO2 reduction to methane

Michael Graetzel, Jing Gao

Achieving industrial electrochemical CO2 reduction necessitates the strategic design of electrocatalysts with high activity, superior selectivity, and excellent stability. Herein, we developed spatially dispersed copper nanocrystals supported by polyanilin ...

2025

Suppressing wide-angle light loss and non-radiative recombination for efficient perovskite solar cells

Michael Graetzel, Jing Gao, Likai Zheng

Surface reflections and non-radiative recombinations create energy losses in perovskite solar cells (PSCs) by hindering the generation and extraction of carriers. These losses can reduce device efficiency in practical applications as the incident angle of ...

Nature Publishing Group2025

Self-assembled bilayer for perovskite solar cells with improved tolerance against thermal stresses

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mingyang Wei

The adoption of perovskite solar cells (PSCs) requires improved resistance to high temperatures and temperature variations. Hole-selective self-assembled monolayers (SAMs) have enabled progress in the performance of inverted PSCs, yet they may compromise t ...

2025

Low-temperature thermite reaction to form oxygen vacancies in metal-oxide semiconductors: A case study of photoelectrochemical cells

Michael Graetzel, Kevin Sivula, Likai Zheng

The formation of oxygen vacancies (Vö) in n-type semiconductors is a key strategy for improving the performance of metal-oxide-based photoanodes. Whereas Vö has traditionally been created by gas- or liquid-phase treatments, here we report a solid-state red ...

2025

Dopamine Dopes the Performance of Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Paul Joseph Dyson, Ursula Röthlisberger, David Lyndon Emsley, Fatemeh Ansari, Felix Thomas Eickemeyer, Lukas Pfeifer, Nikolaos Lempesis, Virginia Carnevali, Ümmügülsüm Günes, Likai Zheng

The electron transport layer (ETL) is a crucial component of perovskite solar cells (PSCs) as it greatly influences their photovoltaic performance. Among various currently used ETL materials, SnO₂ stands out due to its unique advantages, including low‐temp ...

Wiley2025

Conformationally Stable and Sterically Hindered Bicyclo[1.1.1]pentane-1,3-diammonium Modification of FAPbI3 Enhances the Performance of Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Lukas Pfeifer

Solution-processed α-FAPbI3 perovskite films frequently exhibit structural defects and impurities that impede the durable operation of solar cells. In this study, we introduced a conformationally stable, sterically bulky molecular passivator, bicyclo[1.1.1 ...

2025

Designing multi-metal-site nanosheet catalysts for CO2 photoreduction to ethylene

Michael Graetzel, Jing Gao

Catalysts featuring multiple active sites hold significant potential for CO2 photoconversion to multi-carbon products. However, multi-metal-site catalysts typically face challenges with low yields and selectivity for ethylene production, with a lack of def ...

2025

Cuprous oxide-Shewanella mediated photolytic hydrogen evolution

Christos Comninellis, Michael Graetzel, Nikolaos Vlachopoulos, Kevin Sivula, 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