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Understanding Phosphonic‐Acid Molecules Based Hole Transport Layers in Perovskite Solar Cells.

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Title: Understanding Phosphonic‐Acid Molecules Based Hole Transport Layers in Perovskite Solar Cells.
Authors: Yang, Yuqian1 (AUTHOR), Shi, Xiaoqiang1 (AUTHOR), Stein, Angelina Noel1 (AUTHOR), Lockett, Matthew R.2 (AUTHOR), Huang, Jinsong1,2 (AUTHOR) jhuang@unc.edu
Source: Advanced Energy Materials. 2/18/2026, Vol. 16 Issue 7, p1-9. 9p.
Subject Terms: *Phosphonic acids, *Solar cells, *Condensed matter, *Hole mobility, *Durability, *Charge transfer, *Interfaces (Physical sciences), *Monomolecular films
Abstract: Self‐assembled monolayers (SAMs) have emerged as an important class of interfacial materials in perovskite solar cells (PSCs), enabling energy level tuning, efficient charge extraction, and improving device efficiency and stability. Among them, phosphonic‐acid‐based SAMs stand out due to their ability to form covalent bonds with transparent conductive oxides (TCOs), working as ultrathin, transparent, and tunable hole transport layers (HTLs). Despite the rapid progress in device development, several fundamental issues remain unclear, which may limit its broad application. In this perspective, we critically analyze the progress made by the community on several scientific questions. We first examine how SAMs are chemically bonded to TCOs, which is complicated by the difficulty in characterizing SAMs coverage on rough TCO substrates. We question the general perception of how charges are collected through SAMs layer to TCOs. And finally, the stability issues related to SAMs are discussed. Addressing these remaining challenges is necessary to bring the SAMs into commercial perovskite solar cell products. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 191655383
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Understanding Phosphonic‐Acid Molecules Based Hole Transport Layers in Perovskite Solar Cells.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+Yuqian%22">Yang, Yuqian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shi%2C+Xiaoqiang%22">Shi, Xiaoqiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Stein%2C+Angelina+Noel%22">Stein, Angelina Noel</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lockett%2C+Matthew+R%2E%22">Lockett, Matthew R.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Jinsong%22">Huang, Jinsong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> jhuang@unc.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Advanced+Energy+Materials%22">Advanced Energy Materials</searchLink>. 2/18/2026, Vol. 16 Issue 7, p1-9. 9p.
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  Data: *<searchLink fieldCode="DE" term="%22Phosphonic+acids%22">Phosphonic acids</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+cells%22">Solar cells</searchLink><br />*<searchLink fieldCode="DE" term="%22Condensed+matter%22">Condensed matter</searchLink><br />*<searchLink fieldCode="DE" term="%22Hole+mobility%22">Hole mobility</searchLink><br />*<searchLink fieldCode="DE" term="%22Durability%22">Durability</searchLink><br />*<searchLink fieldCode="DE" term="%22Charge+transfer%22">Charge transfer</searchLink><br />*<searchLink fieldCode="DE" term="%22Interfaces+%28Physical+sciences%29%22">Interfaces (Physical sciences)</searchLink><br />*<searchLink fieldCode="DE" term="%22Monomolecular+films%22">Monomolecular films</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Self‐assembled monolayers (SAMs) have emerged as an important class of interfacial materials in perovskite solar cells (PSCs), enabling energy level tuning, efficient charge extraction, and improving device efficiency and stability. Among them, phosphonic‐acid‐based SAMs stand out due to their ability to form covalent bonds with transparent conductive oxides (TCOs), working as ultrathin, transparent, and tunable hole transport layers (HTLs). Despite the rapid progress in device development, several fundamental issues remain unclear, which may limit its broad application. In this perspective, we critically analyze the progress made by the community on several scientific questions. We first examine how SAMs are chemically bonded to TCOs, which is complicated by the difficulty in characterizing SAMs coverage on rough TCO substrates. We question the general perception of how charges are collected through SAMs layer to TCOs. And finally, the stability issues related to SAMs are discussed. Addressing these remaining challenges is necessary to bring the SAMs into commercial perovskite solar cell products. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1002/aenm.202505937
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 9
        StartPage: 1
    Subjects:
      – SubjectFull: Phosphonic acids
        Type: general
      – SubjectFull: Solar cells
        Type: general
      – SubjectFull: Condensed matter
        Type: general
      – SubjectFull: Hole mobility
        Type: general
      – SubjectFull: Durability
        Type: general
      – SubjectFull: Charge transfer
        Type: general
      – SubjectFull: Interfaces (Physical sciences)
        Type: general
      – SubjectFull: Monomolecular films
        Type: general
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      – TitleFull: Understanding Phosphonic‐Acid Molecules Based Hole Transport Layers in Perovskite Solar Cells.
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            NameFull: Yang, Yuqian
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            NameFull: Shi, Xiaoqiang
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            NameFull: Stein, Angelina Noel
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            NameFull: Lockett, Matthew R.
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            NameFull: Huang, Jinsong
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            – D: 18
              M: 02
              Text: 2/18/2026
              Type: published
              Y: 2026
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              Value: 16
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            – TitleFull: Advanced Energy Materials
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