Thickness-dependent crack suppression and wrinkle formation in freestanding BaTiO3 membranes
Abstract
Freestanding ferroelectric oxide membranes offer a promising route toward silicon-integrated low-power electronic and memory devices, but reproducible membrane quality remains challenging, particularly in ultrathin BaTiO3 (BTO), where cracking and wrinkling hinder integration. Here, we show that crack and wrinkle formation in released BaTiO3 membranes can be tuned by jointly controlling oxide thickness and polymer support thickness. Reducing the BaTiO3 thickness from 15 nm to 5 nm suppresses large-area, optically visible cracking across the analysed regions, but promotes dense nanoscale wrinkling, revealing a trade-off between fracture mitigation and morphological instability. In 10 nm BaTiO3 membranes, polymer support thickness further modulates wrinkling, with an intermediate thickness reducing wrinkle density. Piezoresponse force microscopy reveals time-dependent evolution of written contrast after release, indicating that apparent ferroelectric response is influenced by polarization switching, post-release morphology, interfacial contact, charge screening, and strain relaxation. These results establish processing guidelines for integrating freestanding ferroelectrics into future devices.
Versions
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BibTeX
@misc{mandal2026thicknessdependent,
title = {{Thickness-dependent crack suppression and wrinkle formation in freestanding BaTiO3 membranes}},
author = {Rajesh Mandal and Ajay Kumar and Nini Pryds},
howpublished = {arXiv},
year = {2026},
month = jul,
doi = {10.48550/arxiv.2607.20054},
eprint = {2607.20054},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.20054},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Thickness-dependent crack suppression and wrinkle formation in freestanding BaTiO3 membranes
AU - Rajesh Mandal
AU - Ajay Kumar
AU - Nini Pryds
PY - 2026
DA - 2026/07/22
PB - arXiv
DO - 10.48550/arxiv.2607.20054
UR - https://arxiv.org/abs/2607.20054
AB - Freestanding ferroelectric oxide membranes offer a promising route toward silicon-integrated low-power electronic and memory devices, but reproducible membrane quality remains challenging, particularly in ultrathin BaTiO3 (BTO), where cracking and wrinkling hinder integration. Here, we show that crack and wrinkle formation in released BaTiO3 membranes can be tuned by jointly controlling oxide thickness and polymer support thickness. Reducing the BaTiO3 thickness from 15 nm to 5 nm suppresses large-area, optically visible cracking across the analysed regions, but promotes dense nanoscale wrinkling, revealing a trade-off between fracture mitigation and morphological instability. In 10 nm BaTiO3 membranes, polymer support thickness further modulates wrinkling, with an intermediate thickness reducing wrinkle density. Piezoresponse force microscopy reveals time-dependent evolution of written contrast after release, indicating that apparent ferroelectric response is influenced by polarization switching, post-release morphology, interfacial contact, charge screening, and strain relaxation. These results establish processing guidelines for integrating freestanding ferroelectrics into future devices.
ER -