A new United Nations report says militants and police units in Gaza publicly beat, maimed and even executed dozens of Palestinians during Hamas’ war with Israel in acts amounting to war crimes.

Nature - Triple-junction solar cells with improved carrier and photon management

Researchers from the Photovoltaics and Thin-Film Electronics Laboratory (PV-Lab) in EPFL's School of Engineering and CSEM have developed a new solar cell that combines exceptional voltage, high efficiency, and scalable manufacturing.

Perovskite photovoltaics entered a transformative phase in 2025, characterized by the widespread transition from n–i–p to p–i–n architectures, rapid progress in tandem device integration and improvements in long-term operational stability. These advances collectively highlight the maturation of perovskite solar cells towards commercial viability and industrial scalability.

Two-dimensional perovskites enable high efficiency in perovskite photovoltaics but compromise operational stability. Yaghoobi Nia et al. form two-dimensional perovskite co-crystals with neutral templating molecules, improving the stability of perovskite solar modules.

Metal halide perovskites exhibit anharmonic lattice vibrations, which lead to high rates of thermal expansion in solar cells. In this Review, Julian A. Steele links the atomistic origins of these effects to the macroscopic thermo-mechanical properties of the materials and devices.

F.B.I. agents searched a Fulton County, Ga., election center for ballots from 2020, escalating an investigation of a heavily Democratic jurisdiction the president has criticized over his defeat.

Shot and killed by immigration agents on a Minneapolis street, he wanted to be a ‘force of good in the world.’

An I.C.U. nurse shot by federal agents was an American citizen with no criminal record, the city police chief said. A New York Times video analysis shows he was holding a phone, not a gun.

Point defects critically influence material properties and require accurate computational modelling for reliable predictions. This Perspective outlines best practices for defect simulations using supe...

The performance of inverted perovskite solar cells has been limited by non-radiative recombination at the perovskite surfaces. Here, authors employ phosphonic acids and piperazinium chloride for homogeneous passivation, achieving certified efficiency of 28.9% for 60 cm2 perovskite-silicon tandems.

This work introduces an in situ precipitation strategy for the hydrogel-based vat photopolymerization of architected ceramics and metals with reduced shrinkages and improved densities. Repeated infus...

The fine-tuning of halide perovskite materials for both performance and stability calls for innovative tools that streamline high-throughput experimentation. Here, we present two complementary systems...

EPFL is a leading university with strong emphasis on basic sciences, engineering and life sciences. Research within its Institute of Chemical Sciences and Engineering (ISIC) includes synthetic, biolog...

Volumetric additive manufacturing (VAM) is an emerging vat photopolymerization technology that boasts improved fabrication speeds, material isotropies, and surface finishes. However, as VAM is only compatible with highly transparent polymer resins, it is extremely challenging to fabricate composites, since it involves the use of resins that contain light-scattering fillers. In this work, we circumvent the transparency criterion by synthesizing the fillers in situ post-fabrication, thus enabling the fabrication of composites using VAM. To demonstrate the versatility and utility of our approach, we converted Xolography-printed hydrogels into magnetic and conductive hydrogel composites with filler weight fractions of up to 65 wt %. We further show that filler growth can be spatially controlled, which enables the fabrication of multimaterial structures. This work presents a facile strategy for the VAM of functional composites and multimaterial structures, which could pave the way toward the fabrication of previously impossible devices and smart materials.

A high-sensitivity, broadband, transient, full-Stokes spectroscopy setup is demonstrated, which can detect quickly varying small signals from chiral emitters.

Goal of limiting warming to 1.5C looks increasingly out of reach, study finds

npj 2D Materials and Applications - Oriented 2D Ruddlesden-Popper metal halides by pulsed laser deposition

Will the double whammy of cracking down on immigrants and defunding research weaken the US as a research hub?

Mobility measurements in highly resistive methylammonium lead iodide (MAPI) are challenging due to high impedance, ion drift, and low mobility. We show that we can address the challenge using intensity-dependent photo-Hall measurements. The key is an improved photo-Hall setup, which enables reliable Hall measurements in the dark and under low-intensity illumination. By tuning the illumination over 4 orders of magnitude, we get the additional information to simultaneously extract hole mobility, electron mobility, and background doping. For the first time, we show that a MAPI single crystal, exhibiting n-type behavior in the dark, can show p-type behavior under light due to the difference in hole and electron mobility. The data partly explain the variability in mobility reported in the literature. We show that one can erroneously extract any mobility from 0 to 25 cm2/(V s) if we restrict the experiment to a small range of illumination intensities. For our MAPI (310) crystal, the measured hole and electron mobilities are 40 and 25.5 cm2/(V s), respectively.

Vapor phase deposition of formamidinium-rich perovskites is hampered by the decomposition of formamidine in the vapor phase. We use the reversibility of this reaction to establish a dynamic equilibriu...

Fast, uncontrolled crystallization with several competing pathways makes solution-processing of phase-pure quasi-two-dimensional (quasi-2D) metal halide Ruddlesden–Popper thin films challenging. Typic...

The structural and photophysical properties of the 2D layered metal halides (4F-PMA)2GeI4 and (4F-PMA)2PbI4 are reported. For the Ge composition, reduced exciton-phonon coupling is found and the abse....

The structural and photophysical properties of the 2D layered metal halides (4F-PMA)2GeI4 and (4F-PMA)2PbI4 are reported. For the Ge composition, reduced exciton-phonon coupling is found and the abse....

The authors show that the (011)C perovskite planes are prone to stacking faults formation in all leading formamidinium-rich perovskite compositions. Using ethylene thiourea as a precursor additive, O...

Although C60 is usually the electron transport layer (ETL) in inverted perovskite solar cells, its molecular nature of C60 leads to weak interfaces that lead to non-ideal interfacial electronic and me...