Home » Hong Kong Polytechnic University researchers break world record with organic solar cells

Hong Kong Polytechnic University researchers break world record with organic solar cells

by Liam Turner
Professor Li Gang, chair professor of energy conversion technology - Hong Kong Polytechnic University

Scientists have achieved a new world record for a next-generation solar cell, which holds the promise for novel applications like building-integrated and window solar panels.

The breakthrough follows two years of research into organic solar cells (OSCs) by the Hong Kong Polytechnic University.

OSCs are more lightweight and flexible than traditional silicon-based solar panels, as they consist of thin layers of organic semiconducting materials.

The materials used are more environmentally friendly and one thousand times thinner than silicon solar cells, meaning they have the potential to be vastly cheaper.

They are also semi-transparent, allowing them to be used not just within building materials, but also on windows.

In the past, OSCs had been too inefficient and costly to be used widely in practical applications.

However, the research team invented a new technique to boost the stability of OSCs, achieving a power-conversion efficiency of 19.3%.

Li Gang, a professor of energy conversion technology at Hong Kong Polytechnic University, said: “The new finding will make OSC research an exciting field, and this will likely create tremendous opportunities in applications like portable electronics and building-integrated photovoltaics.

“This is a very encouraging result for the long-standing research on OSCs that I have conducted over the past two decades.

“We have already achieved better OSC efficiency and this will subsequently help accelerate the applications of solar energy.”

Professor Li and his team believe an efficiency rate above 20% is now achievable using their new technique.

The 19.3% efficiency record is still a long way off other solar cell technologies, with researchers passing the 30% barrier last year with a tandem design that used the so-called ‘miracle material’ perovskite.

The research is detailed in a study, titled ‘19.3% Binary Organic Solar Cell and Low Non-Radiative Recombination Enabled by Non-Monotonic Intermediate State Transition’, published in the scientific journal Nature Communications.

Dozens of startups are already working on novel applications for harvesting solar energy, such as London-based Filia, which integrates solar technology into blackout blinds.

California-based Ubiquitous Energy raised more than $30m (c.£24m) last year to push forward its vision of turning skyscrapers into ‘vertical solar farms’ through the development of windows capable of converting sunlight into electricity.

The firm aims to begin production at some point next year following further research and development.

Image: Professor Li Gang, chair professor of energy conversion technology. Credit: Hong Kong Polytechnic University

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