Publications by Silver Hamill Turren Cruz

In Operando, Photovoltaic, and Microscopic Evaluation of Recombination Centers in Halide Perovskite-Based Solar Cells

Ulf Anders Hagfeldt, Henry Snaith, Silver Hamill Turren Cruz

The origin of the low densities of electrically active defects in Pb halide perovskite (HaP), a crucial factor for their use in photovoltaics, light emission, and radiation detection, remains a matter of discussion, in part because of the difficulty in det ...

AMER CHEMICAL SOC2022

Low-cost high-efficiency system for solar-driven conversion of CO2 to hydrocarbons

Ulf Anders Hagfeldt, Silver Hamill Turren Cruz

Conversion of carbon dioxide into hydrocarbons using solar energy is an attractive strategy for storing such a renewable source of energy into the form of chemical energy (a fuel). This can be achieved in a system coupling a photovoltaic (PV) cell to an el ...

National Academy of Sciences2019

Phosphonic Acid Modification of the Electron Selective Contact: Interfacial Effects in Perovskite Solar Cells

Ulf Anders Hagfeldt, Rebecca Hill, Wolfgang Richard Tress, Juan-Pablo Correa-Baena, Silver Hamill Turren Cruz

The role electron-transport layers (ETLs) play in perovskite solar cells (PSCs) is still widely debated. Conduction band alignment at the perovskite/ETL interface has been suggested to be an important role for the performance of the solar cells. However, l ...

AMER CHEMICAL SOC2019

A chain is as strong as its weakest link - Stability study of MAPbI(3) under light and temperature

Michael Graetzel, Ulf Anders Hagfeldt, Amita Ummadisingu, Michael Saliba, Philippe Jürgen Holzhey, Pankaj Kumar Yadav, Silver Hamill Turren Cruz

The stability of perovskite solar cells is a key issue for industrial development. One reason for this is the volatile organic methylammonium (MA) cation, which is prone to degas under elevated temperatures from the perovskite. At the same time, small amou ...

2019

PbZrTiO3 ferroelectric oxide as an electron extraction material for stable halide perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Michael Saliba, Silver Hamill Turren Cruz, Hui-Seon Kim, Zaiwei Wang, Monica Marcela Lira Cantu, Anna Morales Melgares, Haibing Xie

State-of-the-art halide perovskite solar cells employ semiconductor oxides as electron transportmaterials. Defects in these oxides, such as oxygen vacancies (Ovac), act as recombination centres and, in air and UV light, reduce the stability of the solar ce ...

2019

Nanoscale mapping of chemical composition in organic-inorganic hybrid perovskite films

Ulf Anders Hagfeldt, Jorge Miguel Dias Almeida Rodrigues Soares, Silver Hamill Turren Cruz, Rodrigo Szostak

Lead-based organic-inorganic hybrid perovskite (OIHP) solar cells can attain efficiencies over 20%. However, the impact of ion mobility and/or organic depletion, structural changes, and segregation under operating conditions urge for decisive and more accu ...

American Association for the Advancement of Science (AAAS)2019

How the formation of interfacial charge causes hysteresis in perovskite solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Wolfgang Richard Tress, Silver Hamill Turren Cruz

In this study, we discuss the underlying mechanism of the current-voltage hysteresis in a hybrid lead-halide perovskite solar cell. We have developed a method based on Kelvin probe force microscopy that enables mapping charge redistribution in an operating ...

ROYAL SOC CHEMISTRY2018

Greener, Nonhalogenated Solvent Systems for Highly Efficient Perovskite Solar Cells

Michael Graetzel, Ulf Anders Hagfeldt, Michael Saliba, Silver Hamill Turren Cruz, Mozhgan Yavari, Mohammad Mahdi Tavakoli

All current highest efficiency perovskite solar cells (PSCs) use highly toxic, halogenated solvents, such as chlorobenzene (CB) or toluene (TLN), in an antisolvent step or as solvent for the hole transporter material (HTM). A more environmentally friendly ...

WILEY-V C H VERLAG GMBH2018

Methylammonium-free, high-performance, and stable perovskite solar cells on a planar architecture

Ulf Anders Hagfeldt, Michael Saliba, Silver Hamill Turren Cruz

Currently, perovskite solar cells (PSCs) with high performances greater than 20% contain bromine (Br), causing a suboptimal bandgap, and the thermally unstable methylammonium (MA) molecule. Avoiding Br and especially MA can therefore result in more optimal ...

American Association for the Advancement of Science2018

Carbon Nanoparticles in High-Performance Perovskite Solar Cells

Konrad Domanski, Nevena Vaskova Marinova, Wolfgang Richard Tress, Michael Saliba, Silver Hamill Turren Cruz, Mozhgan Yavari

2018

Elucidation of Charge Recombination and Accumulation Mechanism in Mixed Perovskite Solar Cells

Shaik Mohammed Zakeeruddin, Michael Saliba, Pankaj Kumar Yadav, Daniel Prochowicz, Silver Hamill Turren Cruz, Mohammad Mahdi Tavakoli

2018

Enhanced charge carrier mobility and lifetime suppress hysteresis and improve efficiency in planar perovskite solar cells

Matthew Thomas Mayer, Wolfgang Richard Tress, Juan-Pablo Correa-Baena, Antonio Abate, Michael Saliba, Silver Hamill Turren Cruz

2018

Low-Temperature Nb-Doped SnO2 Electron-Selective Contact Yields over 20% Efficiency in Planar Perovskite Solar Cells

Shaik Mohammed Zakeeruddin, Ludmilla Steier, Matthew Thomas Mayer, Wolfgang Richard Tress, Jingshan Luo, Juan-Pablo Correa-Baena, Jiyoun Seo, Elham Halvani Anaraki, Silver Hamill Turren Cruz

2018

Planar Perovskite Solar Cells with High Open-Circuit Voltage Containing a Supramolecular Iron Complex as Hole Transport Material Dopant

Shaik Mohammed Zakeeruddin, Wolfgang Richard Tress, Yasemin Saygili, Juan-Pablo Correa-Baena, Michael Saliba, Marina Freitag, Bartholomeus Wilhelmus Henricus Saes, Silver Hamill Turren Cruz

2018

Poly(ethylene glycol)-[60]Fullerene-Based Materials for Perovskite Solar Cells with Improved Moisture Resistance and Reduced Hysteresis

Shaik Mohammed Zakeeruddin, Amita Ummadisingu, Konrad Domanski, Wolfgang Richard Tress, Michael Saliba, Philippe Jürgen Holzhey, Silver Hamill Turren Cruz

2018

Globularity-Selected Large Molecules for a New Generation of Multication Perovskites

Michael Graetzel, Ulf Anders Hagfeldt, Wolfgang Richard Tress, Juan-Pablo Correa-Baena, Antonio Abate, Michael Saliba, Filippo de Angelis, Silver Hamill Turren Cruz

Perovskite solar cells (PSCs) use perovskites with an APbX(3) structure, where A is a monovalent cation and X is a halide such as Cl, Br, and/or I. Currently, the cations for high-efficiency PSCs are Rb, Cs, methylammonium (MA), and/or formamidinium (FA). ...

Wiley-Blackwell2017

Chemical Distribution of Multiple Cation (Rb+, Cs+, MA(+), and FA(+)) Perovskite Materials by Photoelectron Spectroscopy

Michael Graetzel, Ulf Anders Hagfeldt, Juan-Pablo Correa-Baena, Michael Saliba, Silver Hamill Turren Cruz

Lead-based mixed perovskite materials have emerged in the last couple of years as promising photovoltaic materials. Recently, it was shown that improved material stability can be achieved by incorporating small amounts of inorganic cations (Cs+ and Rb+), p ...

American Chemical Society2017

Identifying and suppressing interfacial recombination to achieve high open-circuit voltage in perovskite solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Konrad Domanski, Wolfgang Richard Tress, Juan-Pablo Correa-Baena, Antonio Abate, Michael Saliba, Elham Halvani Anaraki, Silver Hamill Turren Cruz

With close to 100% internal quantum efficiency over the absorption spectrum, photocurrents in perovskite solar cells (PSCs) are at their practical limits. It is therefore imperative to improve open-circuit voltages (VOC) in order to go beyond the current 1 ...

Royal Society of Chemistry2017

Perovskite solar cell - electrochemical double layer capacitor interplay

Michael Graetzel, Nikolaos Vlachopoulos, Ulf Anders Hagfeldt, Juan-Pablo Correa-Baena, Michael Saliba, Silver Hamill Turren Cruz

We demonstrate that by a proper design of a system comprising a perovskite solar cell (PSC) coupled to an electrochemical double-layer capacitor (EDLC), it is possible to simultaneously improve both the PSC and EDLC performance and outperform each single u ...

Elsevier2017

Migration of cations induces reversible performance losses over day/night cycling in perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt, Konrad Domanski, Wolfgang Richard Tress, Juan-Pablo Correa-Baena, Antonio Abate, Taisuke Matsui, Michael Saliba, Filippo de Angelis, Silver Hamill Turren Cruz

Perovskites have been demonstrated in solar cells with a power conversion efficiency of well above 20%, which makes them one of the strongest contenders for next generation photovoltaics. While there are no concerns about their efficiency, very little is ...

Royal Soc Chemistry2017