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  • Wu, Yeyong  (6)
  • Chemistry/Pharmacy  (6)
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  • Chemistry/Pharmacy  (6)
RVK
  • 1
    Online Resource
    Online Resource
    Green Solvent Processable, Asymmetric Dopant‐Free Hole Transport Layer Material for Efficient and Stable n‐i‐p Perovskite Solar Cells and Modules
    Wiley ; 2023
    In:  Angewandte Chemie Vol. 135, No. 46 ( 2023-11-13)
    Details
    In: Angewandte Chemie, Wiley, Vol. 135, No. 46 ( 2023-11-13)
    Abstract: The use of dopant‐free hole transport layers (HTLs) is critical in stabilizing n‐i‐p perovskite solar cells (pero‐SCs). However, these HTL materials are often processed with toxic solvents, which is not ideal for industrial production. Upon substituting them with green solvents, a trade‐off emerges between maintaining the high crystallinity of the HTL materials and ensuring high solubility in the new solvents. In this paper, we designed a novel, linear, organic small molecule, BDT‐C8‐3O, by introducing an asymmetric polar oligo(ethylene glycol) side chain. This method not only overcomes the solubility limitations in green solvents but also enables stacking the conjugated main chains in two patterns, which further enhances crystallinity and hole mobility. As a result, the n ‐ i ‐ p pero‐SCs based on chlorobenzene‐ or green (natural compound) solvent 3‐methylcyclohexanone‐processed BDT‐C8‐3O HTL that without any dopant delivered world‐recorded power conversion efficiencies of 24.11 % (certified of 23.82 %) and 23.53 %, respectively. The devices also demonstrated remarkable operational and high‐temperature stabilities, maintaining over 84 % and 79.5 % of their initial efficiency for 2000 h, respectively. Encouragingly, dopant‐free BDT‐C8‐3O HTL exhibits significant advantages in large‐area fabrication, achieving state‐of‐the‐art PCEs exceeding 20 % for 5×5 cm 2 modules (active area: 15.64 cm 2 ), even when processed using green solvents.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v135.46
    DOI: 10.1002/ange.202312231
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Iodonium Initiators: Paving the Air‐free Oxidation of Spiro‐OMeTAD for Efficient and Stable Perovskite Solar Cells
    Wiley ; 2024
    In:  Angewandte Chemie Vol. 136, No. 5 ( 2024-01-25)
    Details
    In: Angewandte Chemie, Wiley, Vol. 136, No. 5 ( 2024-01-25)
    Abstract: To date, perovskite solar cells (pero‐SCs) with doped 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (Spiro‐OMeTAD) hole transporting layers (HTLs) have shown the highest recorded power conversion efficiencies (PCEs). However, their commercialization is still impeded by poor device stability owing to the hygroscopic lithium bis(trifluoromethanesulfonyl)imide and volatile 4‐tert‐butylpyridine dopants as well as time‐consuming oxidation in air. In this study, we explored a series of single‐component iodonium initiators with strong oxidability and different electron delocalization properties to precisely manipulate the oxidation states of Spiro‐OMeTAD without air assistance, and the oxidation mechanism was clearly understood. Iodine (III) in the diphenyliodonium cation (IP + ) can accept a single electron from Spiro‐OMeTAD and forms Spiro‐OMeTAD⋅ + owing to its strong oxidability. Moreover, because of the coordination of the strongly delocalized TFSI − with Spiro‐OMeTAD⋅ + in a stable radical complex, the resulting hole mobility was 30 times higher than that of pristine Spiro‐OMeTAD. In addition, the IP‐TFSI initiator facilitated the growth of a homogeneous and pinhole‐free Spiro‐OMeTAD film. The pero‐SCs based on this oxidizing HTL showed excellent efficiencies of 25.16 % (certified: 24.85 % for 0.062‐cm 2 ) and 20.71 % for a 15.03‐cm 2 module as well as remarkable overall stability.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v136.5
    DOI: 10.1002/ange.202316183
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2024
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Iodonium Initiators: Paving the Air‐free Oxidation of Spiro‐OMeTAD for Efficient and Stable Perovskite Solar Cells
    Wiley ; 2024
    In:  Angewandte Chemie International Edition Vol. 63, No. 5 ( 2024-01-25)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 63, No. 5 ( 2024-01-25)
    Abstract: To date, perovskite solar cells (pero‐SCs) with doped 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (Spiro‐OMeTAD) hole transporting layers (HTLs) have shown the highest recorded power conversion efficiencies (PCEs). However, their commercialization is still impeded by poor device stability owing to the hygroscopic lithium bis(trifluoromethanesulfonyl)imide and volatile 4‐tert‐butylpyridine dopants as well as time‐consuming oxidation in air. In this study, we explored a series of single‐component iodonium initiators with strong oxidability and different electron delocalization properties to precisely manipulate the oxidation states of Spiro‐OMeTAD without air assistance, and the oxidation mechanism was clearly understood. Iodine (III) in the diphenyliodonium cation (IP + ) can accept a single electron from Spiro‐OMeTAD and forms Spiro‐OMeTAD⋅ + owing to its strong oxidability. Moreover, because of the coordination of the strongly delocalized TFSI − with Spiro‐OMeTAD⋅ + in a stable radical complex, the resulting hole mobility was 30 times higher than that of pristine Spiro‐OMeTAD. In addition, the IP‐TFSI initiator facilitated the growth of a homogeneous and pinhole‐free Spiro‐OMeTAD film. The pero‐SCs based on this oxidizing HTL showed excellent efficiencies of 25.16 % (certified: 24.85 % for 0.062‐cm 2 ) and 20.71 % for a 15.03‐cm 2 module as well as remarkable overall stability.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v63.5
    DOI: 10.1002/anie.202316183
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2024
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Green Solvent Processable, Asymmetric Dopant‐Free Hole Transport Layer Material for Efficient and Stable n‐i‐p Perovskite Solar Cells and Modules
    Wiley ; 2023
    In:  Angewandte Chemie International Edition Vol. 62, No. 46 ( 2023-11-13)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 62, No. 46 ( 2023-11-13)
    Abstract: The use of dopant‐free hole transport layers (HTLs) is critical in stabilizing n‐i‐p perovskite solar cells (pero‐SCs). However, these HTL materials are often processed with toxic solvents, which is not ideal for industrial production. Upon substituting them with green solvents, a trade‐off emerges between maintaining the high crystallinity of the HTL materials and ensuring high solubility in the new solvents. In this paper, we designed a novel, linear, organic small molecule, BDT‐C8‐3O, by introducing an asymmetric polar oligo(ethylene glycol) side chain. This method not only overcomes the solubility limitations in green solvents but also enables stacking the conjugated main chains in two patterns, which further enhances crystallinity and hole mobility. As a result, the n ‐ i ‐ p pero‐SCs based on chlorobenzene‐ or green (natural compound) solvent 3‐methylcyclohexanone‐processed BDT‐C8‐3O HTL that without any dopant delivered world‐recorded power conversion efficiencies of 24.11 % (certified of 23.82 %) and 23.53 %, respectively. The devices also demonstrated remarkable operational and high‐temperature stabilities, maintaining over 84 % and 79.5 % of their initial efficiency for 2000 h, respectively. Encouragingly, dopant‐free BDT‐C8‐3O HTL exhibits significant advantages in large‐area fabrication, achieving state‐of‐the‐art PCEs exceeding 20 % for 5×5 cm 2 modules (active area: 15.64 cm 2 ), even when processed using green solvents.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v62.46
    DOI: 10.1002/anie.202312231
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Functional Ionic Liquid Polymer Stabilizer for High‐Performance Perovskite Photovoltaics
    Wiley ; 2023
    In:  Angewandte Chemie Vol. 135, No. 16 ( 2023-04-11)
    Details
    In: Angewandte Chemie, Wiley, Vol. 135, No. 16 ( 2023-04-11)
    Abstract: The stability‐related issues arising from the perovskite precursor inks, films, device structures and interdependence remain severely under‐explored to date. Herein, we designed an ionic‐liquid polymer (poly[Se‐MI][BF 4 ]), containing functional moieties like carbonyl (C=O), selenium (Se + ), and tetrafluoroborate (BF 4 − ) ions, to stabilize the whole device fabrication process. The C=O and Se + can coordinate with lead and iodine (I − ) ions to stabilize lead polyhalide colloids and the compositions of the perovskite precursor inks for over two months. The Se + anchored on grain boundaries and the defects passivated by BF 4 − efficiently suppress the dissociation and migration of I − in perovskite films. Benefiting from the synergistic effects of poly[Se‐MI][BF 4 ], high efficiencies of 25.10 % and 20.85 % were exhibited by a 0.062‐cm 2 device and 15.39‐cm 2 module, respectively. The devices retained over 90 % of their initial efficiency under operation for 2200 h.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v135.16
    DOI: 10.1002/ange.202300690
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Functional Ionic Liquid Polymer Stabilizer for High‐Performance Perovskite Photovoltaics
    Wiley ; 2023
    In:  Angewandte Chemie International Edition Vol. 62, No. 16 ( 2023-04-11)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 62, No. 16 ( 2023-04-11)
    Abstract: The stability‐related issues arising from the perovskite precursor inks, films, device structures and interdependence remain severely under‐explored to date. Herein, we designed an ionic‐liquid polymer (poly[Se‐MI][BF 4 ]), containing functional moieties like carbonyl (C=O), selenium (Se + ), and tetrafluoroborate (BF 4 − ) ions, to stabilize the whole device fabrication process. The C=O and Se + can coordinate with lead and iodine (I − ) ions to stabilize lead polyhalide colloids and the compositions of the perovskite precursor inks for over two months. The Se + anchored on grain boundaries and the defects passivated by BF 4 − efficiently suppress the dissociation and migration of I − in perovskite films. Benefiting from the synergistic effects of poly[Se‐MI][BF 4 ], high efficiencies of 25.10 % and 20.85 % were exhibited by a 0.062‐cm 2 device and 15.39‐cm 2 module, respectively. The devices retained over 90 % of their initial efficiency under operation for 2200 h.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v62.16
    DOI: 10.1002/anie.202300690
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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