Friday, January 21, 2022

Photon recycling: The key to high-efficiency perovskite solar cells

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Additional gentle emission is achieved by recursively recycling trapped photons in perovskites. Credit: Dr. Changsoon Cho

Scientists from TU Dresden, in cooperation with researchers at Seoul National University (SNU) and Korea University (KU), demonstrated the position of the re-use of photons (often known as ‘photon recycling’) and lightweight scattering results in perovskite solar cells, offering a pathway in the direction of high-efficiency solar power conversion. The examine has been printed in Science Advances.

Metal halide perovskites are receiving nice consideration as next-generation semiconductors for solar power conversion. Since the primary demonstration of three.8 % effectivity in 2009, efficiencies have elevated quickly and state-of-the-art perovskite exhibit excessive efficiencies over 25 %, shut to the file efficiencies of silicon photovoltaics. This over the last decade raises the query of whether or not perovskite solar can be ready to attain the higher (thermodynamic) restrict of photovoltaic effectivity, which is understood to be 34 % in single-junction semiconductors. To strategy this purpose, it’s theoretically identified that the solar cell should not solely be an excellent gentle absorber, but in addition be an excellent gentle emitter.

The researchers from the Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) on the TU Dresden famous the position of the photon impact. When a photon is radiated inside re-absorbing semiconductors akin to perovskites, it may be re-absorbed by the emitter itself and generate a brand new photon by way of photoluminescence. Such a strategy of recursively re-absorbing and re-emitting the photons is known as photon recycling. While this phenomenon has been beforehand demonstrated by a number of analysis teams, its sensible contribution to the effectivity of perovskite solar cells has been beneath in depth debate. Based on the gadgets ready by the teams in SNU and KU, the IAPP researchers found that photon recycling and lightweight scattering results drastically enhance the sunshine emission effectivity by an element of ~5, considerably enhancing the photovoltage of perovskite solar cells.

Their work reveals the sensible advantages of photon recycling in perovskite solar cells. “Perovskites are already good absorbers. Now it’s time to improve their light-emitting ability, to even further increase their already high power conversion efficiencies,” says Dr. Changsoon Cho, who led the work as a Humboldt analysis fellow at IAPP. “Understanding photon recycling is a crucial step towards this direction.” The work predicts that the contribution of photon recycling, together with the suppression of varied optoelectrical losses, will lead to an additional enhance in efficiency sooner or later. Using photon recycling, the higher restrict for the effectivity of the perovskite solar cells is proven to rise from 29.2 % to 31.3 %.

“With the fundamental insights regarding the role of recycling at hand, we have a unique possibility to further enhance the perovskite solar cell efficiency, thus offering this technology ever brighter prospects to compete with the well-established silicon-based photovoltaics,” provides Prof. Yana Vaynzof, Chair of Emerging Electronic Technologies on the Institute of Applied Physics and the Center for Advancing Electronics Dresden (cfaed). Indeed, the enhancements within the potential of inspire to additional pursue the commercialization of this expertise. “Our research shows the potential of the technology, but much further effort in research and development is needed before the technology can enter ,” says Prof. Karl Leo, head of the IAPP and European Inventor Award winner.

Novel technique to fabricate lead halide perovskite solar cells with file effectivity

More info:
Changsoon Cho et al, Effects of photon recycling and scattering in high-performance perovskite solar cells, Science Advances (2021). DOI: 10.1126/sciadv.abj1363

Photon recycling: The key to high-efficiency perovskite solar cells (2022, January 14)
retrieved 14 January 2022

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