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Iodide Salt Surface Etching Reduces Energy Loss in CdTe Nanocrystal Solar Cells.

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Title: Iodide Salt Surface Etching Reduces Energy Loss in CdTe Nanocrystal Solar Cells.
Authors: Huang, Jielin1 (AUTHOR), Wang, Xuyang1,2 (AUTHOR), Chen, Yilin1 (AUTHOR), Chen, Zhenyu1,2 (AUTHOR), Lin, Qiaochu1 (AUTHOR), Huang, Qichuan1 (AUTHOR), Qin, Donghuan1,2 (AUTHOR) qindh@scut.edu.cn
Source: Nanomaterials (2079-4991). Aug2025, Vol. 15 Issue 15, p1180. 11p.
Subjects: Solar cells, Solar cell efficiency, Charge carrier mobility, Energy dissipation, Sodium iodide, Cadmium telluride, Surface defects, Etching reagents
Abstract: CdTe nanocrystals (NCs) have emerged as a promising active layer for efficient thin-film solar cells due to their outstanding optical properties and simple processing techniques. However, the low hole concentration and high resistance in the CdTe NC active layer lead to high carrier recombination in the back contact. Herein, we developed a novel 2-iodothiophene as a wet etching solution to treat the surface of CdTe NC. We found that surface treatment using 2-iodothiophene leads to reduced interface defects and improves carrier mobility simultaneously. The surface properties of CdTe NC thin films after iodide salt treatment are revealed through surface element analysis, space charge limited current (SCLC) studies, and energy level investigations. The CdTe NC solar cells with 2-iodothiophene treatment achieved power conversion efficiency (PCE) of 4.31% coupled with a higher voltage than in controlled devices (with NH4I-treated ones, 3.08% PCE). [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI 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.)
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DbLabel: Engineering Source
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  Label: Title
  Group: Ti
  Data: Iodide Salt Surface Etching Reduces Energy Loss in CdTe Nanocrystal Solar Cells.
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  Data: <searchLink fieldCode="AR" term="%22Huang%2C+Jielin%22">Huang, Jielin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Xuyang%22">Wang, Xuyang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Yilin%22">Chen, Yilin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Zhenyu%22">Chen, Zhenyu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lin%2C+Qiaochu%22">Lin, Qiaochu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Qichuan%22">Huang, Qichuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qin%2C+Donghuan%22">Qin, Donghuan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> qindh@scut.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Aug2025, Vol. 15 Issue 15, p1180. 11p.
– Name: Subject
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  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Solar+cells%22">Solar cells</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+cell+efficiency%22">Solar cell efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+carrier+mobility%22">Charge carrier mobility</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+dissipation%22">Energy dissipation</searchLink><br /><searchLink fieldCode="DE" term="%22Sodium+iodide%22">Sodium iodide</searchLink><br /><searchLink fieldCode="DE" term="%22Cadmium+telluride%22">Cadmium telluride</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+defects%22">Surface defects</searchLink><br /><searchLink fieldCode="DE" term="%22Etching+reagents%22">Etching reagents</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: CdTe nanocrystals (NCs) have emerged as a promising active layer for efficient thin-film solar cells due to their outstanding optical properties and simple processing techniques. However, the low hole concentration and high resistance in the CdTe NC active layer lead to high carrier recombination in the back contact. Herein, we developed a novel 2-iodothiophene as a wet etching solution to treat the surface of CdTe NC. We found that surface treatment using 2-iodothiophene leads to reduced interface defects and improves carrier mobility simultaneously. The surface properties of CdTe NC thin films after iodide salt treatment are revealed through surface element analysis, space charge limited current (SCLC) studies, and energy level investigations. The CdTe NC solar cells with 2-iodothiophene treatment achieved power conversion efficiency (PCE) of 4.31% coupled with a higher voltage than in controlled devices (with NH4I-treated ones, 3.08% PCE). [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.3390/nano15151180
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 1180
    Subjects:
      – SubjectFull: Solar cells
        Type: general
      – SubjectFull: Solar cell efficiency
        Type: general
      – SubjectFull: Charge carrier mobility
        Type: general
      – SubjectFull: Energy dissipation
        Type: general
      – SubjectFull: Sodium iodide
        Type: general
      – SubjectFull: Cadmium telluride
        Type: general
      – SubjectFull: Surface defects
        Type: general
      – SubjectFull: Etching reagents
        Type: general
    Titles:
      – TitleFull: Iodide Salt Surface Etching Reduces Energy Loss in CdTe Nanocrystal Solar Cells.
        Type: main
  BibRelationships:
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          Name:
            NameFull: Huang, Jielin
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            NameFull: Wang, Xuyang
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            NameFull: Chen, Yilin
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            NameFull: Chen, Zhenyu
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            NameFull: Lin, Qiaochu
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            NameFull: Huang, Qichuan
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            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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            – TitleFull: Nanomaterials (2079-4991)
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