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A cross-linked molecular contact for stable operation of perovskite/silicon tandem solar cells.

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Title: A cross-linked molecular contact for stable operation of perovskite/silicon tandem solar cells.
Authors: Zhang, Boxue (AUTHOR), Luo, Junsheng (AUTHOR), Yin, Haomiao (AUTHOR), Li, Qing (AUTHOR), Sun, Siqi (AUTHOR), Zhang, Ningxuan (AUTHOR), Gan, Nan (AUTHOR), Azam, Muhammad (AUTHOR), Park, Tae Wan (AUTHOR), Wan, Zhongquan (AUTHOR), Jia, Chunyang (AUTHOR), Wei, Mingyang (AUTHOR), Park, So Min (AUTHOR)
Source: Science. 11/20/2025, Vol. 390 Issue 6775, p837-842. 6p.
Subjects: Perovskite, Silicon, Energy conversion, Schiff bases, Thermal stability, Hybrid solar cells, Chemical stability, Chemical bonds
Abstract: Monolithic perovskite/silicon tandem solar cells surpass the power-conversion efficiency limits of single-junction solar cells but face challenges in operational stability. We identified fill factor diminution as a key performance-loss mode in the state-of-the-art tandem architecture. We reveal that widely used hole-selective molecular contacts, which enhance tandem cell performance, undergo thermal degradation that undermines charge transport. At elevated temperatures, the resistance of conventional monomeric contacts increases by about sixfold because of thermal-induced disorder. To stabilize interfacial structures, we introduce in situ synthesized cross-linked molecular contacts based on Schiff base linkages. One-square-centimeter perovskite/silicon tandem solar cells achieved power-conversion efficiencies exceeding 34% (33.61% certified), and three independent devices retained 96.2 ± 1.7% of their initial performance after about 1200-hour maximum power point operation under AM1.5G illumination at 65°C. Editor's summary: Polymerizing phosphonic acid hole transporters through Schiff-base chemistry was shown to enhance the operational stability of perovskite-silicon tandem solar cells at elevated temperatures. Zhang et al. reduced the thermal degradation of these self-assembled layers by derivatizing the molecules with primary amines that were cross-linked with aldehyde-functionalized bipyridine molecules. One-square-centimeter tandem solar cells achieved power conversion efficiencies exceeding 34% and lost less than 4% of their initial performance after about 1200 hours of maximum power point tracking at 65°C. —Phil Szuromi [ABSTRACT FROM AUTHOR]
Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: A cross-linked molecular contact for stable operation of perovskite/silicon tandem solar cells.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Boxue%22">Zhang, Boxue</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Luo%2C+Junsheng%22">Luo, Junsheng</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yin%2C+Haomiao%22">Yin, Haomiao</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Qing%22">Li, Qing</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Siqi%22">Sun, Siqi</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Ningxuan%22">Zhang, Ningxuan</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gan%2C+Nan%22">Gan, Nan</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Azam%2C+Muhammad%22">Azam, Muhammad</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Park%2C+Tae+Wan%22">Park, Tae Wan</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wan%2C+Zhongquan%22">Wan, Zhongquan</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jia%2C+Chunyang%22">Jia, Chunyang</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wei%2C+Mingyang%22">Wei, Mingyang</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Park%2C+So+Min%22">Park, So Min</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Science%22">Science</searchLink>. 11/20/2025, Vol. 390 Issue 6775, p837-842. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon%22">Silicon</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+conversion%22">Energy conversion</searchLink><br /><searchLink fieldCode="DE" term="%22Schiff+bases%22">Schiff bases</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Hybrid+solar+cells%22">Hybrid solar cells</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+stability%22">Chemical stability</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+bonds%22">Chemical bonds</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Monolithic perovskite/silicon tandem solar cells surpass the power-conversion efficiency limits of single-junction solar cells but face challenges in operational stability. We identified fill factor diminution as a key performance-loss mode in the state-of-the-art tandem architecture. We reveal that widely used hole-selective molecular contacts, which enhance tandem cell performance, undergo thermal degradation that undermines charge transport. At elevated temperatures, the resistance of conventional monomeric contacts increases by about sixfold because of thermal-induced disorder. To stabilize interfacial structures, we introduce in situ synthesized cross-linked molecular contacts based on Schiff base linkages. One-square-centimeter perovskite/silicon tandem solar cells achieved power-conversion efficiencies exceeding 34% (33.61% certified), and three independent devices retained 96.2 ± 1.7% of their initial performance after about 1200-hour maximum power point operation under AM1.5G illumination at 65°C. Editor's summary: Polymerizing phosphonic acid hole transporters through Schiff-base chemistry was shown to enhance the operational stability of perovskite-silicon tandem solar cells at elevated temperatures. Zhang et al. reduced the thermal degradation of these self-assembled layers by derivatizing the molecules with primary amines that were cross-linked with aldehyde-functionalized bipyridine molecules. One-square-centimeter tandem solar cells achieved power conversion efficiencies exceeding 34% and lost less than 4% of their initial performance after about 1200 hours of maximum power point tracking at 65°C. —Phil Szuromi [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.ady6874
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        Text: English
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        PageCount: 6
        StartPage: 837
    Subjects:
      – SubjectFull: Perovskite
        Type: general
      – SubjectFull: Silicon
        Type: general
      – SubjectFull: Energy conversion
        Type: general
      – SubjectFull: Schiff bases
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Hybrid solar cells
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      – SubjectFull: Chemical stability
        Type: general
      – SubjectFull: Chemical bonds
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      – TitleFull: A cross-linked molecular contact for stable operation of perovskite/silicon tandem solar cells.
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              Text: 11/20/2025
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