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PreprintCC BYChemRxiv

Halide Exchange via Perovskite Nanocrystals for Interfacial Defect Passivation in Solar Cells

  • Poyoja Rout
  • Chaya Kerkera
  • Sarang Mashale
  • Smruti Ranjan Panda
  • Laxman Gouda
  • Ritika Dey1,2
  • Vivek Tiwari1,2
  • Aditya Sadhanala
  1. 1Solid State Structural Chemistry Unit (SSCU
  2. 2Indian Institute of Science
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Abstract

Metal halide perovskites have emerged as leading candidates for next-generation optoelectronics, with perovskite solar cells (PSCs) achieving power conversion efficiencies (PCEs) exceeding 26%. However, solution-processed hybrid perovskite films typically suffer from non-radiative recombination and ion migration driven by surface and interfacial defects, limiting device performance, fill factor, and long-term stability. To address these bottlenecks, we report a novel, scalable interface engineering strategy utilizing bromide-rich perovskite nanocrystals to modify 3D perovskite film surfaces via self-driven solid-state halide exchange. The resulting surface-graded heterojunction passivates key iodide vacancies, suppresses ion migration, and optimizes charge extraction. Consequently, modified PSCs demonstrate a ~5% boost in short-circuit current density () and an improved fill factor of 75.3%, driving a ~10% relative increase in PCE from 20.13% (control) to 22.19%. This simple, single-step nanocrystal treatment provides a promising pathway toward robust, scalable, and high-efficiency optoelectronic architectures.

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Cite

BibTeXRIS
BibTeX
@misc{rout2026halide,
  title = {{Halide Exchange via Perovskite Nanocrystals for Interfacial Defect Passivation in Solar Cells}},
  author = {Poyoja Rout and Chaya Kerkera and Sarang Mashale and Smruti Ranjan Panda and Laxman Gouda and Ritika Dey and Vivek Tiwari and Aditya Sadhanala},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15007814/v2},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15007814/v2},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Halide Exchange via Perovskite Nanocrystals for Interfacial Defect Passivation in Solar Cells
AU  - Poyoja Rout
AU  - Chaya Kerkera
AU  - Sarang Mashale
AU  - Smruti Ranjan Panda
AU  - Laxman Gouda
AU  - Ritika Dey
AU  - Vivek Tiwari
AU  - Aditya Sadhanala
PY  - 2026
DA  - 2026/10/14
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15007814/v2
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15007814/v2
AB  - Metal halide perovskites have emerged as leading candidates for next-generation optoelectronics, with perovskite solar cells (PSCs) achieving power conversion efficiencies (PCEs) exceeding 26%. However, solution-processed hybrid perovskite films typically suffer from non-radiative recombination and ion migration driven by surface and interfacial defects, limiting device performance, fill factor, and long-term stability. To address these bottlenecks, we report a novel, scalable interface engineering strategy utilizing bromide-rich perovskite nanocrystals to modify 3D perovskite film surfaces via self-driven solid-state halide exchange. The resulting surface-graded heterojunction passivates key iodide vacancies, suppresses ion migration, and optimizes charge extraction. Consequently, modified PSCs demonstrate a ~5% boost in short-circuit current density () and an improved fill factor of 75.3%, driving a ~10% relative increase in PCE from 20.13% (control) to 22.19%. This simple, single-step nanocrystal treatment provides a promising pathway toward robust, scalable, and high-efficiency optoelectronic architectures.
ER  -