Lead-free

Lead-free perovskites assist in creating a ‘fabric’ that turns body movement into electricity

Scientists at Nanyang Technological University in Singapore (NTU) and Tsinghua University have developed a stretchable and waterproof ‘fabric’ that turns energy generated from body movements into electrical energy. The fabric contains a polymer that, when pressed or squeezed, converts mechanical stress into electrical energy. It is also made with stretchable spandex as a base layer and integrated with a rubber-like material to keep it strong, flexible, and waterproof.

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The fabric-based energy harvesting prototype (right) and the stretchable electrode (left)

The team showed that tapping on a 3cm by 4cm piece of the new fabric generated enough electrical energy to light up 100 LEDs. The fabric can withstand washing, folding and crumpling without performance degradation, and it could maintain stable electrical output for up to five months, demonstrating its potential for use as a smart textile and wearable power source.

Read the full story Posted: Jun 07,2022

Tin perovskite solar cells achieve improved stability thanks to additives

A research team, led by Professor Iván Mora Seró from the Institute of Advanced Materials (INAM) of the Universitat Jaume I of Castelló, has improved the efficiency and durability of tin perovskite solar cells. The cells presented in the recent study exceeded 1,300 hours of operational stability, thanks to the incorporation of additives in the preparation of the devices.

Improved stability of tin PSCs achieved via additives image

Tin-based halide perovskites are being studied as potential candidates for lead-free perovskite solar cells. In the case of tin, an efficiency of more than 14% has been achieved so far, but it has major stability problems. This new work has introduced a combination of dipropylammonium iodide and sodium borohydride, two additives that have made it possible to prepare devices with PCEs of more than 10%, which boast greater stability and have maintained 96% of the initial PCE after 1,300 hours under solar illumination in a nitrogen atmosphere.

Read the full story Posted: Mar 20,2022

Israeli researchers develop self-healing perovskite nanocrystals

A team from Israel's Technion Institute of Technology has announced the development of self-healing perovskite nanocrystals.

Having to frequently replace electronics due to malfunctioning of materials is unavoidable today, since every device suffers from degradation as a result of defects that accumulate during use over time. This generates, in addition to customer frustration and costs, a heavy environmental footprint.

Read the full story Posted: Jan 03,2022

Researchers pinpoint a lead-dominated Interaction impacting the carrier spin dynamics in halide perovskites

An international research team from TU Dort­mund Uni­ver­sity, the Russian Academy of Sciences and ETH Zürich has dis­cov­ered that the electron dynamics in perovskite crystals are largely determined by lead. This discovery suggests that replacing this element could enable better control of the crystals' material properties.

TU Dort­mund Uni­ver­sity Professor Dmitri Yakovlev's group investigated ultrafast interaction processes between optically excited charge carriers and their surroundings in perovskite crystals. The team was able to show that the magnetic properties can be regulated on an ultrafast time scale through the use of optical pulses with a duration of trillionths of a second. This proof that they can be con­trolled is of particular interest for possible new applications.

Read the full story Posted: Dec 07,2021

Unique ionogel-based encapsulation could assist in creating impact-resistant, stable, and lead-safe perovskite modules

Researchers from University of North Carolina, North Carolina State University and Chinese Academy of Sciences have fabricated a mini perovskite solar module using a novel encapsulation technique based on the use of a self-healable, lead-adsorbing ionogel that prevents lead leakage and improves stability. The solar module has an area of 31.5cm2 and has a reported efficiency of 22.9%.

Lead-absorbing ionogel encapsulation for more stable and safer PSCs imageIonogel microstructure and lead adsorption mechanism. Image from article

The scientists explained that ionogel sealants were applied on the panel's front glass and between electrode and encapsulation glass, with the 100μm-thick inonogel being able to hold the shattered glass together even if the glass breaks. This is claimed to effectively suppress lead leakage from broken modules after hail test or compression by car wheels, and soaking in water for 45 days.

Read the full story Posted: Nov 09,2021

Researchers synthesize double perovskite nanocrystals with bright emission based on triplet STEs

Unlike the narrow band emission based on free excitons in lead-perovskite nanocrystals (NCs), the low electronic dimensionality in lead-free double perovskite NCs can lead to self-trapped excitons (STEs), generating a broadband emission. To date, how the singlet/triplet STEs influence the photoluminescence properties and whether triplet STEs can generate efficient emission in double-perovskite NCs has been unclear.

Bright Triplet Self-Trapped Excitons to Dopant Energy Transfer in Halide Double-Perovskite Nanocrystals image

A research team, led by Prof. Han Keli and Yang Bin from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences, recently synthesized double perovskite nanocrystals with bright photoluminescence emission based on triplet STEs.

Read the full story Posted: Oct 19,2021

Researchers explore lead-free rare-earth-based double perovskite nanocrystals with near-infrared emission

A research group, led by Prof. Han Keli from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), in collaboration with Prof. Miao Xiangyang's group from Shanxi Normal University, recently explored the colloidal synthesis of all-inorganic rare-earth-based double perovskite NCs with NIR emission, and revealed their exciton dynamics.

Previous studies mainly focused on the photoluminescence (PL) in the visible region, and those on the near-infrared (NIR) PL of lead-free perovskite NCs are rare.

Read the full story Posted: Sep 10,2021

Researchers design photo-rechargeable lead-free perovskite batteries

Researchers from the Hong Kong University of Science and Technology (HKUST) have developed an inexpensive, lightweight, and lead-free photo-battery that has dual functions in harvesting solar energy and storing energy on a single device. This could enable users to charge a battery under the sun, without having to plug the device into the wall.

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A photo-rechargeable lead-free perovskite lithium-ion battery image

Despite the theoretical potential of such photo-batteries, in reality it seems that the poor interface between materials tends to create problems with charge transport, greatly reducing the efficiency in comparison to the simple system of a solar cell wired to an external battery. A team led by Prof. Jonathan Eugene Halpert, Assistant Professor from the Department of Chemistry at HKUST, has made advancements towards developing more efficient photo-batteries by using perovskites.

Read the full story Posted: Aug 21,2021

Researchers design efficient germanium-lead perovskite LEDs

A research team, led by Prof. Di Dawei from the Zhejiang University College of Optical Science and Engineering, recently discovered that by using germanium (Ge), an environmentally friendly group-IV element, to partially substitute lead in the perovskite, it is possible to create highly luminescent perovskite materials and devices.

Schematic of the Ge'Pb PeLED device structure imageSchematic of the Ge'Pb PeLED device structure. Image from Nature Communications

To resolve the toxicity problem that arises from the use of lead, an effective method has been the use of tin (Sn) as a partial or full replacement of lead in the perovskite materials. This strategy has been particularly successful for perovskite solar cells. However, tin-based (including tin-lead) perovskite materials are generally very poor light emitters, causing unsatisfactory performance of tin-based perovskite light-emitting devices (LEDs).

Read the full story Posted: Aug 08,2021

EPFL team addresses the lead issue of perovskite solar cells

A team of scientists at EPFL has come up with an efficient solution to the lead problem of perovskite solar cells, which involves using a transparent phosphate salt that does not block solar light and hence doesn't affect performance.

Removing the lead hazard from perovskite solar cells image

In case the solar panel fails, the phosphate salt immediately reacts with lead to produce a water-insoluble compound that cannot leach out to the soil, and which can be recycled.

Read the full story Posted: Jul 16,2021