Ulf Anders Hagfeldt

Cette personne n’est plus à l’EPFL

Publications associées (575)

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Publications associées (575)

Compositional and Interface Engineering of Organic-Inorganic Lead Halide Perovskite Solar Cells

Shaik Mohammed Zakeeruddin, Haizhou Lu, Ulf Anders Hagfeldt, Anurag Krishna

Power conversion efficiency (PCE) of the perovskite solar cells (PSCs) has remarkably been increased from3.1%to 25.2%. The fast expansion of the PSCs has been along with the development of compositional and interface engineering, which has been playing a c ...

2020

Revealing the Perovskite Film Formation Using the Gas Quenching Method by In Situ GIWAXS: Morphology, Properties, and Device Performance

Sandy Sanchez Alonso, Ulf Anders Hagfeldt, Rodrigo Szostak

The optoelectronic properties, morphology, and consequently the performance of metal halide perovskite solar cells are directly related to the crystalline phases and intermediates formed during film preparation. The gas quenching method is compatible with ...

2020

Vapor-assisted deposition of highly efficient, stable black-phase FAPbI(3) perovskite solar cells

Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Ursula Röthlisberger, Wolfgang Richard Tress, Felix Thomas Eickemeyer, Yuhang Liu, Haizhou Lu, Likai Zheng, Ulf Anders Hagfeldt, Xiong Li, Zaiwei Wang, Fan Fu, Paramvir Ahlawat, Aditya Mishra, Claudia Esther Avalos, Brian Irving Carlsen, Xianfu Zhang, Anand Agarwalla, Ying Yang

Mixtures of cations or halides with FAPbI(3) (where FA is formamidinium) lead to high efficiency in perovskite solar cells (PSCs) but also to blue-shifted absorption and long-term stability issues caused by loss of volatile methylammonium (MA) and phase se ...

AMER ASSOC ADVANCEMENT SCIENCE2020

Tailored Amphiphilic Molecular Mitigators for Stable Perovskite Solar Cells with 23.5% Efficiency

Shaik Mohammed Zakeeruddin, Felix Thomas Eickemeyer, Yuhang Liu, Ulf Anders Hagfeldt, Mohammad Ibrahim Dar, Xiong Li, Dan Ren, Zaiwei Wang, Bowen Yang, Linfeng Pan, Brian Irving Carlsen, Hongwei Zhu, Marco Alejandro Ruiz Preciado, Shilong Wang, Xiaofei Dong

Passivation of interfacial defects serves as an effective means to realize highly efficient and stable perovskite solar cells (PSCs). However, most molecular modulators currently used to mitigate such defects form poorly conductive aggregates at the perovs ...

2020

Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology

Ulf Anders Hagfeldt

All-inorganic cesium lead bromide (CsPbBr3) perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb stability. However, the fabrication of high-quality CsPbBr3 films still remain ...

2020

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

Michael Graetzel, Shaik Mohammed Zakeeruddin, Felix Thomas Eickemeyer, Yuhang Liu, Ulf Anders Hagfeldt, Mohammad Ibrahim Dar, Hong Zhang, Jiahuan Zhang, Jiyoun Seo, Seckin Akin, 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-V C H VERLAG GMBH2020

Passivation Mechanism Exploiting Surface Dipoles Affords High-Performance Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Shaik Mohammed Zakeeruddin, Kevin Sivula, Jun Ho Yum, Fatemeh Ansari, Ulf Anders Hagfeldt, Kazuteru Nonomura, Erfan Shirzadi

The employment of 2D perovskites is a promising approach to tackling the stability and voltage issues inherent in perovskite solar cells. It remains unclear, however, whether other perovskites with different dimensionalities have the same effect on efficie ...

AMER CHEMICAL SOC2020

Formamidinium-Based Dion-Jacobson Layered Hybrid Perovskites: Structural Complexity and Optoelectronic Properties

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Wolfgang Richard Tress, Jovana Milic, Marko Mladenovic, Ulf Anders Hagfeldt, Mohammad Ibrahim Dar, Yang Li, Amita Ummadisingu, Paramvir Ahlawat, Brian Irving Carlsen, Farzaneh Jahanbakhshi, Algirdas Ducinskas

Layered hybrid perovskites have emerged as a promising alternative to stabilizing hybrid organic-inorganic perovskite materials, which are predominantly based on Ruddlesden-Popper structures. Formamidinium (FA)-based Dion-Jacobson perovskite analogs are de ...

WILEY-V C H VERLAG GMBH2020

The application of transition metal complexes in hole-transporting layers for perovskite solar cells: Recent progress and future perspectives

Ulf Anders Hagfeldt

In the past few years, the photovoltaic community has witnessed a fast growth of inorganic-organic hybrid perovskite solar cells (PSCs) due to their exceptional power conversion efficiencies with a certified record value exceeding 25%, which rivals the est ...

ELSEVIER SCIENCE SA2020

Liquid State and Zombie Dye Sensitized Solar Cells with Copper Bipyridine Complexes Functionalized with Alkoxy Groups

Shaik Mohammed Zakeeruddin, Rosario Scopelliti, Jacques-Edouard Moser, Ulf Anders Hagfeldt, Joël Teuscher, Yasemin Saygili, Hui-Seon Kim, Marina Freitag, Marko Stojanovic

Copper redox mediators can be employed in dye sensitized solar cells (DSCs) both as liquid electrolytes or as solid state hole transport materials (HTMs). The solid state devices that employ copper complex HTMs can be simply obtained by solvent evaporation ...

2020

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