UNSW takes out efficiency world record for revolutionary solar cell

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A team from UNSW’s Australian Center for Advanced Photovoltaics has achieved a 7.6% efficiency record for a “full sized” CZTS PV cell.

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Xiaojing Hao leads the CZTS research at UNSW. She has been recognized as one of the university's '20 Rising Stars'. wikimedia commons
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PV Magazine

Researchers at the University of New South Wales (UNSW) have achieved a world record conversion efficiency of 7.6% for a 1cm2 copper zinc tin sulfide (CZTS) solar cell. Japan’s Solar Frontier, with IBM and Tokyo Ohka Kogyo, have previously achieved 12.6%, however on a smaller 0.42cm2 substrate.

Xiaojing Hao leads the CZTS research at UNSW. She has been recognized as one of the university's '20 Rising Stars'. wikimedia commons
Xiaojing Hao leads the CZTS research at UNSW. She has been recognized as one of the university’s ’20 Rising Stars’.
wikimedia commons

A team from UNSW’s Australian Center for Advanced Photovoltaics has achieved a 7.6% efficiency record for a “full sized” CZTS PV cell. The result has been confirmed by the National Renewable Energy Laboratory (NREL).

The UNSW team is lead by Xiaojing Hao, who claims that her team is “on the way” to rivaling leading thin film technologies cadmium telluride (CdTe) and copper indium gallium selenide (CIGS).

“This is the first step on CZTS’s road to beyond 20% efficiency, and marks a milestone in its journey from the lab to [a] commercial product,” said Hao. “There is still a lot of work needed to catch up with CdTe and CIGS, in both efficiency and cell size.” Hao added that she sees the 20% efficiency being reached “probably… within the next few years.”

The UNSW team note that CZTS cells use abundant materials, and do not contain any toxic cadmium or selenium. As such, CZTS semiconductors are cheap to produce and can be manufactured using techniques that are already commercially available.

Renowned PV researcher Martin Green, Xiaojing Hao’s mentor at the UNSW, said that CZTS material is additionally of interest in tandem applications with crystalline silicon (c-Si).

“We’re interested in these higher bandgap CZTS cells for two reasons,” said Green. “They… respond better than silicon to blue wavelengths of light, and can be stacked as a thin-film on top of silicon cells to ultimately improve the overall performance.” Green, considered a pioneer in the crystalline silicon field, is currently developing c-Si-perovskite tandem cells.

Hao noted that CZTS’ benign environmental profile and its ability to be deployed flexible applications made it ideal for BIPV applications. She added that many efficiency-boosting “tricks” that have been employed by CIGS and CdTe developers and manufacturers could be applied to CZTS technology, potentially accelerating its efficiency roadmap.

Source: PV Magazine. Reproduced with permission.

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1 Comment
  1. john 3 years ago

    The UNSW just keeps doing the research Dr. Green has to be one of Australia’s more valuable researches.
    Being able to capture more of the incoming spectrum will result in even higher performing panels.

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