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Zapping a new approach to solar cells

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In a world in need of cheaper, sustainable energy solutions, a simple and fast microwave experiment with the chemical element phosphorus at Flinders University has opened the prospect of more affordable and effective super-thin solar cells. Flinders University nanotechnology researchers made flakes of phosphorene, a 2D form of phosphorus only a few atoms thick, which could not only boost the energy capacity of popular dye-sensitised solar cells (DSSC) but potentially remove the need for the expensive component platinum. Sheets and flakes of this few-layer phosphorus, just a few billionths of a metre thick, could improve the efficiency of certain types of photovoltaic cells, the research team led by Professor Joseph Shapter claim.

Journal/conference: Angewandte Chemie International Edition

Organisation/s: Flinders University

Funder: ARC, ANFF and Flinders University,

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From: Flinders University

In a world in need of cheaper, sustainable energy solutions, a simple and fast microwave experiment with the chemical element phosphorus at Flinders University has opened the prospect of more affordable and effective super-thin solar cells.

Flinders University nanotechnology researchers made flakes of phosphorene, a 2D form of phosphorus only a few atoms thick, which could not only boost the energy capacity of popular dye-sensitised solar cells (DSSC) but potentially remove the need for the expensive component platinum.

Sheets and flakes of this few-layer phosphorus, just a few billionths of a metre thick, could improve the efficiency of certain types of photovoltaic cells, the research team led by Professor Joseph Shapter claim.

Solar cells based on carbon nanotubes and silicon promise a cheaper and easier-to-manufacture alternative to crystalline silicon cells. However one challenge with these new solar cells is to boost their ability to effectively convert sunlight into electricity.

One approach is to include a layer of ultra-thin nanoflakes of phosphorene in these  solar cells and researchers hope phosphorene has all the right properties to make it suitable for increasing solar cell efficiency.

The microwave experiments – and the discovery’s potential applications in the solar industry – have been published in leading international chemistry journals Angewandte Chemie, Advanced Function Materials and Small Methods.

The microwave method involves immersing phosphorus in a special liquid and exposing it to microwaves for 10 minutes – in contrast to previous protocols involving 15 hours of heating.

The Australian team used the phosphorene to fabricate DSSC which showed superior photovoltaic efficiency of 8.31% which outperforms expensive platinum-based cells.  

DSSC are an emerging field of thin-film, semi-flexible and semi-transparent solar cells which are simple to make but limited by quite costly components such as platinum and ruthenium.

In the second study, the team again used the microwave method to make phosphorene flakes and then added them to carbon nanotube–silicon solar cells to show a significant improvement in the cells’ power conversion.

“With these promising early results, further studies with the microwave technique and other solvents will help improve stability and durability of phosphorene and allow us to look at ways to produce larger amounts of phosphorene for possible commercial applications,” says co-author Dr Christopher Gibson, from the Flinders College of Science and Engineering.

Project leaders Professor Shapter, Dr Gibson, Dr Munkhbayar Batmunkh and Mrs Munkhjargal Bat-Erdene are among a team of Flinders Institute for Nanoscale Science and Technology researchers looking to improve solar cell efficiency – also including a more sustainable material called perovskite.

This research was also supported by the South Australian nodes of Microscopy Australia and the Australian National Fabrication Facility (ANFF), along with support from the Australian Research Council (ARC) Discovery Program (DP150101354 and DP160101301).

References:  

“Electrocatalytic Activity of a 2D Phosphorene‐Based Heteroelectrocatalyst for Photoelectrochemical Cells’ (2018), by Flinders University with University of Technology Sydney (UTS) and University of Adelaide researchers M Batmunkh, A Shrestha, M Bat-Erdene, MJ Nine, CJ Shearer, AD Slattery, SA Tawfik, MJ Ford, S Dai, S Qiao and JG Shapter is published by Wiley Online in Angewandte Chemie International Edition 57, 2644–2647.

‘Efficiency Enhancement of Single‐Walled Carbon Nanotube‐Silicon Heterojunction Solar Cells Using Microwave‐Exfoliated Few‐Layer Black Phosphorus’ (2017) by Flinders and UTS researchers M Bat-Erdene, M Batmunkh, SA Tawfik, M Fronzi, MJ Ford, CJ Shearer, LP Yu, M Dadkhah, JR Gascooke, CT Gibson and JG Shapter is published in Advanced Function Materials 27, 1704488.

‘Efficient and Fast Synthesis of Few‐Layer Black Phosphorus via Microwave‐Assisted Liquid‐Phase Exfoliation’ (2017) by Flinders and UTS researchers M Bat‐Erdene, M Batmunkh, CJ Shearer, SA Tawfik, MJ Ford, LP Yu, A J Sibley, AD Slattery, JS Quinton, CT Gibson, JG Shapter was published in Small Methods 1 (12), 1700260.

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    Dr Christopher Gibson discussing the research

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