Breakthrough tandem solar cells from Hong Kong Polytechnic University
Published July 21 at 21:00
A team at Hong Kong Polytechnic University has created advanced perovskite-organic tandem solar cells that maintain performance even when partially shaded. These cells can withstand a breakdown voltage exceeding -35 volts. In tests, after exposure to -40 volts, they retained over 90% of their original efficiency, and after 2,000 hours of operation at -4.5 volts, efficiency remained at 97%.
Shading part of a solar panel can generate negative voltage, known as reverse bias, which reduces current output and may damage thin-film cells. The primary cause of degradation in organic materials is defects in the active layer where electricity is generated. The researchers removed isolated clusters of acceptor material within the donor-acceptor mix, a key step in improving cell stability.
Research findings
Last year, these tandem cells achieved an efficiency of 25.9%, which has now risen above 26%.
“We have made significant progress in the stability of organic and perovskite-organic tandem solar cells under challenging reverse bias conditions,” said Professor Li Gang from the Department of Electrical and Electronic Engineering at Hong Kong Polytechnic University.He added, “Our research provides a breakthrough understanding of both device operation and the durability of organic and perovskite solar technologies.”
The findings were published in the journal Nature Materials. This work opens new possibilities for developing more efficient and reliable solar technologies, which could shape the future of renewable energy.
These new perovskite-organic tandem solar cells could transform how solar energy is harnessed, particularly in situations where shading is a common issue. Improved efficiency and stability pave the way for large-scale adoption in the energy sector, potentially reducing reliance on traditional power sources and accelerating the shift to clean energy.
In addition to advancements in shading resistance, the solar energy sector is witnessing other remarkable innovations. For instance, a recent breakthrough has led to the development of a solar cell that surpasses the 30% efficiency mark without relying on rare metals. This progress not only highlights the potential for more sustainable materials in solar technology but also complements the ongoing efforts to enhance solar panel performance. To explore this exciting development, read more about the affordable solar cell achieving over 30% efficiency.