Publications by Sandy Sanchez Alonso

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

TEMPO bulk passivation boosts the performance and operational stability of rapid-annealed FAPI perovskite solar cells

Michael Graetzel, Kevin Sivula, Felix Thomas Eickemeyer, Lukas Pfeifer, Sandy Sanchez Alonso

In this work, we present a high-performance, stable formamidinium lead iodide (FAPI) perovskite solar cell (PSC) achieved through the use of 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) bulk passivation and rapid photonic annealing. Utilizing flash infrared ...

2025

Photonic Processing of MAPbI(3) Films by Flash Annealing and Rapid Growth for High-Performance Perovskite Solar Cells (vol 6, 2200641, 2022)

Sandy Sanchez Alonso

2023

Thermally controlled growth of photoactive FAPbI(3) films for highly stable perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Cyril Cayron, Felix Thomas Eickemeyer, Pascal Alexander Schouwink, Sandy Sanchez Alonso

We employ flash infrared annealing to investigate the phase transition of formamidinium lead triiodide (FAPbI(3)) thin films for their solar cell applications. Measuring the enthalpy changes of the FAPbI(3) composition at different heating rates allows us ...

ROYAL SOC CHEMISTRY2022

Photonic Processing of MAPbI(3) Films by Flash Annealing and Rapid Growth for High-Performance Perovskite Solar Cells

Sandy Sanchez Alonso

Defects in polycrystalline halide perovskite films can cause a decrease of the solar cell photoconversion efficiency and stability. The perovskite film enhanced during crystal growth by controlling the processing method can alleviate defects and the relate ...

2022

A universal co-solvent dilution strategy enables facile and cost-effective fabrication of perovskite photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Sandy Sanchez Alonso, Ulf Anders Hagfeldt, Dan Ren, Hong Zhang, Linfeng Pan, Paramvir Ahlawat, Anurag Krishna

Cost management and toxic waste generation are two key issues that must be addressed before the commercialization of perovskite optoelectronic devices. We report a ground-breaking strategy for eco-friendly and cost-effective fabrication of highly efficient ...

Nature Research2022

Flash Infrared Annealing for Perovskite Solar Cell Processing

Sandy Sanchez Alonso, Ulf Anders Hagfeldt

Organic-inorganic perovskites have an impressive potential for the design of next generation solar cells and are currently considered for upscaling and commercialization. Currently, perovskite solar cells rely on spin-coating which is neither practical for ...

JOURNAL OF VISUALIZED EXPERIMENTS2021

Nanoscale interfacial engineering enables highly stable and efficient perovskite photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Mounir Driss Mensi, Sandy Sanchez Alonso, Mathias Dankl, Ulf Anders Hagfeldt, 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

Thermodynamic stability screening of IR-photonic processed multication halide perovskite thin films

Michael Graetzel, Shaik Mohammed Zakeeruddin, Pascal Alexander Schouwink, Sandy Sanchez Alonso, Ulf Anders Hagfeldt, Brian Irving Carlsen, Natalie Flores Diaz

We report a material screening study for phase transitions of multication hybrid halide perovskite films. Two hundred sixty-six films processed with flash infrared annealing were optically and structurally characterized. This data was compiled into a datab ...

Royal Society of Chemistry2021

Rapid hybrid perovskite film crystallization from solution

Nikolaos Vlachopoulos, Lukas Pfeifer, Sandy Sanchez Alonso, Ulf Anders Hagfeldt

The use of a solution process to grow perovskite thin films allows to extend the material processability. It is known that the physicochemical properties of the perovskite material can be tuned by altering the solution precursors as well as by controlling ...

Royal Society of Chemistry2021