Investigation of ferroelectric and piezoelectric properties of hybrid halide perovskite (HHP) thin films for the Internet of Things (IoT) applications

作者：Raja Sekhar Muddam · 发表于：Open MIND · 年份：2026 · DOI：10.17630/sta/1699 · 研究领域：Perovskite Materials and Applications、Chemical and Physical Properties of Materials、Advanced Sensor and Energy Harvesting Materials

This thesis presents a systematic investigation of the ferroelectric and piezoelectric properties of layered hybrid halide perovskite (HHP) thin films to integrate the corresponding piezoelectric devices for self-powered Internet of Things (IoT) systems. Initial efforts focused on the optimization of layered halide perovskite of (BA)₂MAₙ₋₁PbₙBr₃ₙ₊₁ (n = 1 and 2) thin films fabricated in a metal/semiconductor/metal (M/S/M) ferroelectric device architecture, emphasizing its importance for integration with electronic devices. This investigation revealed the importance of additional barrier layers (PCBM and Cr/Cr₂O₃) for improving ferroelectric properties. This study further identifies the challenges in achieving phase pure (BA)₂FAₙ₋₁PbₙBr₃ₙ₊₁ (n = 2 to 5) and (PEA)₂MAₙ₋₁PbₙBr₃ₙ₊₁ (n = 1 to 4) HHP thin films deposited with blade coating technique under ambient conditions. The phase purity and polar properties were confirmed through X-ray diffraction, differential scanning calorimetry, UV-Visible, and Raman spectroscopy. The piezoelectric energy-harvesting capabilities of (BA)₂FAₙ₋₁PbₙBr₃ₙ₊₁ (n = 2 to 5) HHP thin films were systematically evaluated under human biological motion and dynamic linear forces. The piezoelectric power output of the (BA)₂FAPb₂Br₇ device improved by ~1.8× after PCBM‑based surface passivation. Additionally, light-induced and pyro-enhanced piezoelectric responses were identified in (BA)₂FAₙ₋₁PbₙBr₃ₙ₊₁ (n = 2 to 5) thin films. The ferroelectric switchable pol...