UNSW professor Martin Green, who revolutionised photovoltaics, says sun’s power is ‘the best option out there’
By: Sophie Vorrath
The “father of PV” – University of New South Wales professor Martin Green – has become the first Australian to win the global energy prize from a shortlist that included Tesla’s Elon Musk.
UNSW said Green had been selected from 44 contenders from 14 countries by a committee of leading scientists to share the $820,000 prize with Russian scientist Sergey Alekseenko, an expert in thermal power engineering.
It said Green was honoured for revolutionising the efficiency and cost of solar photovoltaics, and making it the lowest-cost option for bulk electricity supply.
Green, the director of the Australian Centre for Advanced Photovoltaics, is a leading specialist in both monocrystalline and polycrystalline silicon solar cells.
In 1989, his team supplied the solar cells for the first photovoltaic system with an energy conversion efficiency of 20%. In 2014 he headed the development team that first demonstrated the conversion of sunlight into electricity with an efficiency of 40%.
Green also invented the PERC solar cell, which accounted for more than 24% of the world’s silicon cell manufacturing capacity at the end of 2017.
The research group he founded at UNSW – the largest university-based PV research group in the world – is broadly credited with driving the enormous reductions in costs in solar PV, largely through the work of Green’s students in establishing manufacturing centres in Asia.
“Not everyone would agree with that attribution,” said Green in an interview with RE on Friday, adding that Tesla’s Musk would have been his pick for the prize for his crucial work of putting electric vehicles on the agenda.
Green was keen to pay tribute to his UNSW solar stablemates, Zhengrong Shi, who left Australia to form Suntech Power in the US, and Stuart Wenham – the “Einstein” of the solar world, who died, aged 60, in December 2017.
“In particular, Stuart created this computer program that was a virtual production line,” Green told RE. “That overcame the language barrier in training hordes of Chinese engineers in setting up these [solar PV] production lines.”
Some 15 to 20 years later, and the global growth of solar PV – now the cheapest new form of energy generation – has soared beyond virtually all predictions.
“If you look at the figures from the last few years, growth has consistently stayed at around 40% a year,” Green said. “If it keeps growing at that rate, we’re looking at hitting a terawatt of solar production in 2024.
“Even if it slows to growth of 20% a year, we are on track to reach production levels of a TW a year in the late 2020s. And that’s the area where you can really start cutting greenhouse gases.”
And that’s what it’s all about – a cheap transition that does not cost more and in fact will likely deliver savings – although some people, and some governments, prefer to remain none the wiser. Which is why awards like this one are so important.
“I think [this is] a good opportunity to get across the message that things have changed with solar and that it’s the best option out there,” Green said. “That’s an important message to get out.
“There’s a growing consensus that we’re going to get most of our energy out of solar down the track. It’s not a matter having to help solar along. It’s not about removing the last remaining barriers – and getting out of the way of [renewable energy].”
Green said removing barriers often meant changing regulations to make them consistent with a solar type of future, as well as overcoming political resistance in places like Australia and the US.