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PreprintCC BY-NC-NDChemRxiv

In situ observation of ultra-giant spherulites in perovskite hydrates

  • Hiroto T. Murakami1,2,3
  1. 1Graduate School of Science and Technology, NARA Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma, Nara, Japan, 630-0192
  2. 2Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushimanaka, Kitaku, Okayama, Okayama, Japan, 700-0082
  3. 3Murakami Lab., Hiroto T. Murakami Inst. (Independent Researcher), 3-21-4, Oshonishimachi, Amagasaki, Hyogo, Japan, 660-0077
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Abstract

Spherulites-iconic, radially textured growth forms in polymers-are shown here to form reproducibly in lead-halide perovskite hydrates on glass.Using Hygro-Triggered Giant Spherulites Formation (HT-GSF), a routine solution-processed perovskite precursor is converted into single-nucleus spherulitic films that expand radially to centimetre scale (up to >1 cm).Real-time optical microscopy captures the moving growth front and records the moment it engulfs and incorporates surrounding particles, providing direct video evidence of particle assimilation during spherulite growth in this materials system.Subsequent annealing converts the white hydrate-derived network into black perovskite while retaining a pronounced out-of-plane (110) texture, yielding centimetre-scale, strongly oriented spherulites with markedly fewer macroscopically visible high-angle grain boundaries than conventional spin-coated films.Under ambient-air ageing, HT-GSF films show only weak hydrate-related signatures after one week, whereas control films exhibit rapid hydrate formation and visible degradation within hours.These findings demonstrate that controlled humidity exposure can be used as a deliberate processing step to engineer large-scale, highly textured perovskite films with improved ambient stability.The stochastic nucleation pattern and macroscopic scale of the resulting films suggest potential utility in physically unclonable function (PUF) applications.

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Cite

BibTeXRIS
BibTeX
@misc{murakami2026situ,
  title = {{In situ observation of ultra-giant spherulites in perovskite hydrates}},
  author = {Hiroto T. Murakami},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv-2025-0dxhw/v10},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv-2025-0dxhw/v10},
  note = {CC BY-NC-ND},
}
RIS
TY  - UNPB
TI  - In situ observation of ultra-giant spherulites in perovskite hydrates
AU  - Hiroto T. Murakami
PY  - 2026
DA  - 2026/10/20
PB  - ChemRxiv
DO  - 10.26434/chemrxiv-2025-0dxhw/v10
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv-2025-0dxhw/v10
AB  - Spherulites-iconic, radially textured growth forms in polymers-are shown here to form reproducibly in lead-halide perovskite hydrates on glass.Using Hygro-Triggered Giant Spherulites Formation (HT-GSF), a routine solution-processed perovskite precursor is converted into single-nucleus spherulitic films that expand radially to centimetre scale (up to >1 cm).Real-time optical microscopy captures the moving growth front and records the moment it engulfs and incorporates surrounding particles, providing direct video evidence of particle assimilation during spherulite growth in this materials system.Subsequent annealing converts the white hydrate-derived network into black perovskite while retaining a pronounced out-of-plane (110) texture, yielding centimetre-scale, strongly oriented spherulites with markedly fewer macroscopically visible high-angle grain boundaries than conventional spin-coated films.Under ambient-air ageing, HT-GSF films show only weak hydrate-related signatures after one week, whereas control films exhibit rapid hydrate formation and visible degradation within hours.These findings demonstrate that controlled humidity exposure can be used as a deliberate processing step to engineer large-scale, highly textured perovskite films with improved ambient stability.The stochastic nucleation pattern and macroscopic scale of the resulting films suggest potential utility in physically unclonable function (PUF) applications.
ER  -