Plastic crystals hold key to record-breaking energy transport

sc604 — Thu, 24 May 2018 18:00:00 +0000

̽��ֱ��researchers, whose work appears in the journal Science, say their findings could be a “game changer” by allowing the energy from sunlight absorbed in these materials to be captured and used more efficiently.

Lightweight semiconducting plastics are now widely used in mass market electronic displays such as those found in phones, tablets and flat-screen televisions. However, using these materials to convert sunlight into electricity to make solar cells is far more complex.

̽��ֱ��photo-excited states – when photons of light are absorbed by the semiconducting material – need to move so that they can be “harvested” before they lose their energy. These excitations typically only travel about 10 nanometres in plastic (or polymeric) semiconductors, so researchers need to build tiny structures patterned at the nanoscale to maximise the “harvest”.

Dr Xu-Hui Jin and colleagues at the ̽��ֱ�� of Bristol developed a new way to make highly ordered crystalline semiconducting structures using polymers.

Dr Michael Price of Cambridge's Cavendish Laboratory measured the distance that the photo-exited states travelled, which reached distances of 200 nanometres – 20 times further than was previously possible.

200 nanometres is especially significant because it is greater than the thickness of material needed to completely absorb ambient light, making these polymers more suitable as “light harvesters” for solar cells and photodetectors.

“ ̽��ֱ��gain in efficiency would actually be for two reasons: first, because the energetic particles travel further, they are easier to “harvest”, and second, we could now incorporate layers around 100 nanometres thick, which is the minimum thickness needed to absorb all the energy from light – the so-called optical absorption depth,” said co-author Dr George Whittell from the ̽��ֱ�� of Bristol. “Previously, in layers this thick, the particles were unable to travel far enough to reach the surfaces.”

“ ̽��ֱ��distance that energy can be moved in these materials comes as a big surprise and points to the role of unexpected quantum coherent transport processes,” said co-author Professor Sir Richard Friend from Cambridge's Cavendish Laboratory, and a Fellow of St John's College.

̽��ֱ��research team now plans to prepare structures thicker than those in the current study and greater than the optical absorption depth, with a view to building prototype solar cells based on this technology.

They are also preparing other structures capable of using light to perform chemical reactions, such as the splitting of water into hydrogen and oxygen.

Reference:
Xu-Hui Jin et al. ‘Long-range exciton transport in conjugated polymer nanofibers prepared by seeded growth.’ Science (2018). DOI: 10.1126/science.aar8104

Adapted from a ̽��ֱ�� of Bristol press release.

Scientists from the Universities of Cambridge and Bristol have found a way to create plastic semiconductor nanostructures that absorb light and transport its energy 20 times further than has been previously observed, paving the way for more flexible and more efficient solar cells and photodetectors.

̽��ֱ��distance that energy can be moved in these materials comes as a big surprise.

Richard Friend

̽��ֱ�� of Bristol

Image showing light emission from the polymeric nanostructures and schematic of a single nanostructure

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̽��ֱ�� of Cambridge - Michael Price

Plastic crystals hold key to record-breaking energy transport