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PreprintCC BYChemRxiv

Synergistic Energetic Realignment and Interfacial Passivation via Perovskite Nanocrystal-Doped Spiro-OMeTAD for Efficient Planar Perovskite Solar Cells

  • Poyoja Rout1,2
  • Deepika Jangid1,2
  • Sarang Mashale1,2
  • Chaya Karkera1,2
  • Avari Roy1,2
  • Laxman Gouda1,2
  • Aditya Sadhanala1,2
  1. 1Centre for Nano Science and Engineering (CeNSE
  2. 2Indian Institute of Science (IISc
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Abstract

Non-radiative recombination at the perovskite/hole transport layer (HTL) interface fundamentally constrains the open-circuit voltage (Voc) and charge-collection efficiency of planar perovskite solar cells. In this work, we report an effective interface engineering strategy of incorporating MAPb (IxBr1-x)3 nanocrystals (NC) into a Spiro-OMeTAD matrix which is used as HTL. Consequently, planar n-i-p devices incorporating the composite HTL deliver an enhanced power conversion efficiency of 20.31 %, highlighted by a surge in π‘‰π‘œπ‘ (up to 1.1 V) alongside stable photocurrent density of 24.62 mA cm βˆ’2 . Electrochemical impedance spectroscopy (EIS) reveals that NC incorporation results in reduced bulk resistance of the Spiro-OMeTAD layer. Furthermore, systematic analysis of the characteristic time constant extracted from EIS measurements provides evidence of halide-ion redistribution which modulate the interfacial energetics and enhance the built-in electric field, thereby contributing to the observed improvement in PCE. This work highlights the potential of nanocrystal-engineered HTLs as an effective approach for potential suppression of interfacial recombination and developing defectpassivated, high-voltage perovskite solar cells.

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Cite

BibTeXRIS
BibTeX
@misc{rout2026synergistic,
  title = {{Synergistic Energetic Realignment and Interfacial Passivation via Perovskite Nanocrystal-Doped Spiro-OMeTAD for Efficient Planar Perovskite Solar Cells}},
  author = {Poyoja Rout and Deepika Jangid and Sarang Mashale and Chaya Karkera and Avari Roy and Laxman Gouda and Aditya Sadhanala},
  howpublished = {ChemRxiv},
  year = {2026},
  month = aug,
  doi = {10.26434/chemrxiv.15008059/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008059/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Synergistic Energetic Realignment and Interfacial Passivation via Perovskite Nanocrystal-Doped Spiro-OMeTAD for Efficient Planar Perovskite Solar Cells
AU  - Poyoja Rout
AU  - Deepika Jangid
AU  - Sarang Mashale
AU  - Chaya Karkera
AU  - Avari Roy
AU  - Laxman Gouda
AU  - Aditya Sadhanala
PY  - 2026
DA  - 2026/08/31
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008059/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008059/v1
AB  - Non-radiative recombination at the perovskite/hole transport layer (HTL) interface fundamentally constrains the open-circuit voltage (Voc) and charge-collection efficiency of planar perovskite solar cells. In this work, we report an effective interface engineering strategy of incorporating MAPb (IxBr1-x)3 nanocrystals (NC) into a Spiro-OMeTAD matrix which is used as HTL. Consequently, planar n-i-p devices incorporating the composite HTL deliver an enhanced power conversion efficiency of 20.31 %, highlighted by a surge in π‘‰π‘œπ‘ (up to 1.1 V) alongside stable photocurrent density of 24.62 mA cm βˆ’2 . Electrochemical impedance spectroscopy (EIS) reveals that NC incorporation results in reduced bulk resistance of the Spiro-OMeTAD layer. Furthermore, systematic analysis of the characteristic time constant extracted from EIS measurements provides evidence of halide-ion redistribution which modulate the interfacial energetics and enhance the built-in electric field, thereby contributing to the observed improvement in PCE. This work highlights the potential of nanocrystal-engineered HTLs as an effective approach for potential suppression of interfacial recombination and developing defectpassivated, high-voltage perovskite solar cells.
ER  -