Engineering news

New production technique 'cuts cost of solar cells by more than 10%'

PE

Joshua Pearce, professor of material sciences and electrical engineering at Michigan Technological University (Credit: Sarah Bird/ Michigan Tech)
Joshua Pearce, professor of material sciences and electrical engineering at Michigan Technological University (Credit: Sarah Bird/ Michigan Tech)

A new production technique has cut the cost of solar cells by more than 10%, potentially boosting the technology’s global ascent even further.

Solar energy already has comparable costs to conventional forms of electricity and is the fastest growing energy source, said materials science and electrical engineering professor Joshua Pearce from Michigan Technological University in the US.

“Improving cost per unit power at the cell level can have massive effects downstream,” he said. “Margins are extremely tight. Everyone's trying to push costs as low as possible.”

To tackle the issue, Pearce and fellow researchers during his sabbatical at Aalto University in Finland investigated the material properties of cells. Silicon used to capture light on solar cells comes in two main forms – perfect crystals that produce higher efficiencies but cost more, and cheaper multi-crystalline silicon that offers lower efficiencies.

Researchers already knew that nano-texturing silicon with dry etching results in a black, highly-efficient material. The process transforms flat surfaces into “forests” of nanoscale needles, trapping light.

Defects in high-surface area materials can also hurt electrical performance, but the researchers found treating the material with an appropriate atomic layer deposition (ALD) mitigated the effect of the defects.

Although dry etching and ALD were previously considered too expensive for practical use, higher production costs were offset by efficiency gains and being able to use cheaper multi-crystalline silicon, cutting the overall cost per unit by 10.8%. Optimisation could boost efficiency even further, Pearce claimed.

“This study points to where the future is going to go in PV manufacturing and what countries might want to do to give themselves a competitive advantage,” he said.

The research was published in Energies.


Content published by Professional Engineering does not necessarily represent the views of the Institution of Mechanical Engineers.
Share:

Read more related articles

Professional Engineering magazine

Current Issue: Issue 6, 2020

Issue 6 online
  • Pushing electric car batteries to the limit
  • Cooling down with novel twist fridges
  • Turning waste into jet fuel
  • ABB Motion Services adapts to cope with pandemic

View all

Professional Engineering app

  • Industry features and content
  • Engineering and Institution news
  • News and features exclusive to app users

Download the Professional Engineering app

Professional Engineering newsletter

A weekly round-up of the most popular and topical stories featured on our website, so you won't miss anything

Subscribe to the Professional Engineering newsletter

Opt into your industry sector newsletter

Related articles