Molecular nanoparticles lead to major advancement in the development of solar cells

August 1, 2017, University of St Andrews
Schematic illustration of the generation of two photons of lower energy (½h) when the organic-inorganic bismuth halide is under illumination of a high-energy photon (h). The two clusters are the subunits of the bulk crystalline material prepared via solution processing. The generation of two photons from one involves the energy transfer between two neighbouring clusters and two relaxation processes. Credit: University of St Andrews

A new study by researchers at the University of St Andrews could herald a major advancement in the development of solar cells.

The efficient use of solar energy for electricity generation is considered vital to reducing , a cause of global warming.

The St Andrews research, led by Professor John Irvine, has demonstrated that the atomically precise nanoparticles known as nanoclusters or molecular nanoparticles are capable of cutting a high-energy photon into two lower-energy ones, which could benefit the development of the third-generation photovoltaics, the direct conversion of light into electricity at the atomic level.

The findings are published today (1 August 2017) in the scientific journal Nature Communications.

The efficiency of an ideal single junction solar cell is limited to 30 per cent to balance the light absorption and the energy of the excited electro-hole pairs. The cutting of a high-energy photon into two photons of nearly half energy could offer the prospect of exceeding the efficiency limit as it will increase the number of charge carriers and efficient use of high-energy light rays in the solar spectrum.

The generation of two low-energy photons from a high-energy one has been observed in quantum dots and lanthanide ions due to the confinement of excitons and the transport of charge carriers from neighbouring ones.

Now the St Andrews-led team has demonstrated the nanoclusters in organic-inorganic hybrid bismuth halide can also be used for the splitting of a high-energy with the nanoclusters and this could bring advances in as they are arranged in a bulk crystalline material that can be processed from solution.

Professor Irvine said: "It is expected that this study would stimulate the study on materials with nanoclusters or low-dimensional organic-inorganic hybrid materials for photonic devices and this atomic precise subunit in crystalline could ease the preparation and processing of nano-sized particles as they are controlled by the intrinsic crystal structure of the material."

Explore further: New material holds promise to create more flexible, efficient technologies

More information: Charge carrier localised in zero-dimensional (CH3NH3)3Bi2I9 clusters. Nature Communications. DOI: 10.1038/s41467-017-00261-9

Related Stories

Solar cell design with over 50% energy-conversion efficiency

April 24, 2017

Solar cells convert the sun's energy into electricity by converting photons into electrons. A new solar cell design could raise the energy conversion efficiency to over 50% by absorbing the spectral components of longer wavelengths ...

Semi-transparent perovskite solar cells for solar windows

May 22, 2017

Scientists are exploring ways to develop transparent or semi-transparent solar cells as a substitute for glass walls in modern buildings with the aim of harnessing solar energy. But this has proven challenging, because transparency ...

Recommended for you

Fish-inspired material changes color using nanocolumns

March 20, 2019

Inspired by the flashing colors of the neon tetra fish, researchers have developed a technique for changing the color of a material by manipulating the orientation of nanostructured columns in the material.

Researchers shed new light on the origins of modern humans

March 20, 2019

Researchers from the University of Huddersfield, with colleagues from the University of Cambridge and the University of Minho in Braga, have been using a genetic approach to tackle one of the most intractable questions of ...

One transistor for all purposes

March 20, 2019

In mobiles, fridges, planes – transistors are everywhere. But they often operate only within a restricted current range. LMU physicists have now developed an organic transistor that functions perfectly under both low and ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.