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Enhancing Thermal Stability of Perovskite Solar Cells through Thermal Transition and Thin Film Crystallization Engineering of Polymeric Hole Transport Layers

https://doi.org/10.1021/acsenergylett.4c01546

Kim, Sanggyun ; Sabury, Sina ; Perini, Carlo_A_R ; Hossain, Tareq ; Yusuf, Augustine_O ; Xiao, Xiangyu ; Li, Ruipeng ; Graham, Kenneth_R ; Reynolds, John_R ; Correa-Baena, Juan-Pablo ( August 2024 , ACS Energy Letters)
Synergistic Role of Water and Oxygen Leads to Degradation in Formamidinium-Based Halide Perovskites

https://doi.org/10.1021/jacs.3c05657

Hidalgo, Juanita ; Kaiser, Waldemar ; An, Yu ; Li, Ruipeng ; Oh, Zion ; Castro-Méndez, Andrés-Felipe ; LaFollette, Diana K. ; Kim, Sanggyun ; Lai, Barry ; Breternitz, Joachim ; et al ( November 2023 , Journal of the American Chemical Society)
Interface Reconstruction from Ruddlesden–Popper Structures Impacts Stability in Lead Halide Perovskite Solar Cells

https://doi.org/10.1002/adma.202204726

Perini, Carlo Andrea Riccardo ; Rojas‐Gatjens, Esteban ; Ravello, Magdalena ; Castro‐Mendez, Andrés‐Felipe ; Hidalgo, Juanita ; An, Yu ; Kim, Sanggyun ; Lai, Barry ; Li, Ruipeng ; Silva‐Acuña, Carlos ; et al ( November 2022 , Advanced Materials)

Abstract
The impact of the bulky‐cation‐modified interfaces on halide perovskite solar cell stability is underexplored. In this work, the thermal instability of the bulky‐cation interface layers used in the state‐of‐the‐art solar cells is demonstrated. X‐ray photoelectron spectroscopy and synchrotron‐based grazing‐incidence X‐ray scattering measurements reveal significant changes in the chemical composition and structure at the surface of these films that occur under thermal stress. The changes impact charge‐carrier dynamics and device operation, as shown in transient photoluminescence, excitation correlation spectroscopy, and solar cells. The type of cation used for surface treatment affects the extent of these changes, where long carbon chains provide more stable interfaces. These results highlight that prolonged annealing of the treated interfaces is critical to enable reliable reporting of performances and to drive the selection of different bulky cations.

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