Article Dans Une Revue Small Science Année : 2025

Co‐Doping Approach for Enhanced Electron Extraction to TiO 2 for Stable Inorganic Perovskite Solar Cells

Noor Titan Putri Hartono
Steven Harvey
Maxim Simmonds
Chiara Frasca
Marlene Härtel
Gennaro Sannino
Emilio Gutierrez-Partida
  • Fonction : Auteur
Zahra Loghman Nia
  • Fonction : Auteur
Fengjiu Yang
Eva Unger
Qiong Wang
Artem Musiienko
Antonio Abate

Résumé

Inorganic perovskite CsPbI 3 solar cells hold great potential for improving the operational stability of perovskite photovoltaics. However, electron extraction is limited by the low conductivity of TiO 2 , representing a bottleneck for achieving stable performance. In this study, a co‐doping strategy for TiO 2 using Nb(V) and Sn(IV), which reduces the material's work function by 80 meV compared to Nb(V) mono‐doped TiO 2 , is introduced. To gain fundamental understanding of the processes at the interfaces between the perovskite and charge‐selective layer, transient surface photovoltage measurements are applied, revealing the beneficial effect of the energetic and structural modification on electron extraction across the CsPbI 3 /TiO 2 interface. Using 2D drift‐diffusion simulations, it is found that co‐doping reduces the interface hole recombination velocity by two orders of magnitude, increasing the concentration of extracted electrons by 20%. When integrated into n–i–p solar cells, co‐doped TiO 2 enhances the projected T S80 lifetimes under continuous AM1.5G illumination by a factor of 25 compared to mono‐doped TiO 2 . This study provides fundamental insights into interfacial charge extraction and its correlation with operational stability of perovskite solar cells, offering potential applications for other charge‐selective contacts.

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hal-05297473 , version 1 (06-12-2025)

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Thomas Gries, Davide Regaldo, Hans Köbler, Noor Titan Putri Hartono, Steven Harvey, et al.. Co‐Doping Approach for Enhanced Electron Extraction to TiO 2 for Stable Inorganic Perovskite Solar Cells. Small Science, 2025, 5 (7), ⟨10.1002/smsc.202400578⟩. ⟨hal-05297473⟩
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