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Article Dans Une Revue Journal of Materials Chemistry A Année : 2020

Interfacial and bulk properties of hole transporting materials in perovskite solar cells: spiro-MeTAD versus spiro-OMeTAD

Mona Shasti
  • Fonction : Auteur
Elham Halvani Anaraki
  • Fonction : Auteur
Dmytro Volyniuk
  • Fonction : Auteur
Juozas Vidas Grazulevicius
Shaik M Zakeeruddin
Abdollah Mortezaali
  • Fonction : Auteur
  • PersonId : 1337337
Michael Grätzel
  • Fonction : Auteur
Anders Hagfeldt
Gjergji Sini

Résumé

Two spiro-MeTAD compounds (1 and 2) were synthesized, characterized by experimental and quantum mechanical methods, and used as hole transporting materials (HTMs) in perovskite solar cells (PSCs). The new compounds differ from spiro-OMeTAD only by the presence of methyl substituents as compared to methoxy groups. This modification results in the absorption band blue shifting by 20 nm as compared to spiro-OMeTAD, increased glass transition temperature for 2, and reduced ionization potentials by 0.02–0.12 eV. Hole mobilities five times larger were obtained for spiro-MeTAD/spiro-MeTAD, which is maintained in the presence of additives. Despite this improvement, J–V measurements in PSCs resulted in a power conversion efficiency (PCE) of 17.2% and 17.05% for 1 and 2 HTMs, respectively, as compared to 19.24% for spiro-OMeTAD. Photoluminescence measurements of perovskite:HTM layers indicate much stronger quenching in the case of spiro-OMeTAD/spiro-MeTAD. These results point to the dominant importance of the perovskite:HTM interfacial properties as compared to the HTM holetransport properties in the bulk. Given that improved hole-mobility and energy-level alignment are the main targets of the current research efforts in this domain, our results alert to the necessity to prioritize the improvement of perovskite–HTM interaction properties.
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Dates et versions

hal-04402241 , version 1 (24-01-2024)

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Xavier Sallenave, Mona Shasti, Elham Halvani Anaraki, Dmytro Volyniuk, Juozas Vidas Grazulevicius, et al.. Interfacial and bulk properties of hole transporting materials in perovskite solar cells: spiro-MeTAD versus spiro-OMeTAD. Journal of Materials Chemistry A, 2020, 8 (17), pp.8527-8539. ⟨10.1039/D0TA00623H⟩. ⟨hal-04402241⟩
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