Researchers quantify photoinduced polaronic distortions in inorganic lead halide perovskite nanocrystals

Understanding the charge mobility of lead-halide perovskite materials is crucial for their use in photovoltaic applications. Using X-ray spectroscopic techniques, the structural deformations affecting the charge mobility, which plays a central role in solar energy conversion, have been identified and quantified by an international team of scientists led by Giulia Mancini (at the University of Pavia) and M. Chergui at EPFL.

Transport phenomena at the nanoscale image

Lead-halide perovskites' use in photovoltaic applications relies on the generation of charges (electrons and hole) upon absorption of light. These charges migrate through the material to generate an electrical current. One of the crucial physical properties in this respect is the so-called charge mobility. Despite their remarkable performances in light-to-electricity conversion, a limitation of perovskites is their charge mobilities, which are orders of magnitude smaller than those of conventional semi-conductors used in photovoltaics.

Sheffield researchers find that low temperatures extend lifetimes of perovskite materials

Researchers at the University of Sheffield have found that storing perovskite precursor solutions at low temperatures extends their operational lifetime from under a month to over four months.

Understanding how to make perovskite solutions more durable and reliable could potentially make the manufacture of perovskite solar cells more efficient, as the process would require fewer batches of more stable material to be produced, saving time, reducing material waste and also allowing device yield and efficiency to be optimized.

Researchers develop Sn-based perovskite material with a wide visible-light absorption band

Semiconductors that can exploit the omnipresent visible spectrum of light for different technological applications are highly sought after, but such semiconductors are often dexpensive and toxic. A group of scientists from Tokyo Institute of Technology and Kyushu University have collaborated to develop a low-cost and non-toxic narrow-gap semiconductor material with potential 'light-based' or photofunctional applications.

A cheaper perovskite-based semiconductor material that is free of toxic lead and can absorb a wide range of visible light with potential photofunctional applications image

Tin-containing oxide semiconductors are cheaper than most semiconductor materials, but their photofunctional applications are constrained by a wide optical band gap. The team of scientists, led by Dr. Kazuhiko Maeda, Associate Professor at the Department of Chemistry, Tokyo Institute of Technology, developed a perovskite-based semiconductor material that is free of toxic lead and can absorb a wide range of visible light.

TCI starts offering new hole selective self-assembled monolayer forming agents to boost perovskite PV performance

The following is a sponsored post by TCI

Tokyo Chemical Industry Company Limited (TCI) is now offering new hole selective self-assembled monolayer (SAM) forming agents, 2PACz [C3663], MeO-2PACz [D5798] and Me-4PACz [M3359] for high performance perovskite solar cells and OPVs.

TCI SAM materials chart, structure and image

The new materials enable efficient, versatile and stable p-i-n perovskite solar cell devices. These materials are useful for tandem solar cells as they grant conformal coverage on rough textures. In fact, a perovskite solar cell that uses the SAM hole transport layer can realize more than 20% efficiency without using dopants or additives. Perovskite-Silicon tandem solar cells that use Me-4PACz as a hole contact material realized 29.15% efficiency. Costs are lowered thanks to extremely low material consumption, and the processing is very simple and scalable.

Scientists propose a sandwich-like structural model for quasi-2D perovskite films

A research team, led by scientists at the ARC Centre of Excellence in Exciton Science, has shown that the two-dimensional (2D) thin films used in some perovskite solar cells closely resemble a sandwich.

This discovery changed common concepts as previously, scientists thought these 2D perovskite films had a ‘gradient’ structure, in which certain components were found deep in the material, with other complementary elements only located nearer to the surface. However, the members of Exciton Science based at the University of Melbourne, together with collaborators at Australia’s national science agency CSIRO and Shandong University, have provided evidence for a sandwich-like structure, in which two layers of the same type (the bread) surround one central, contrasting layer (the filling).