Unveiling the contribution of piezoelectric and ferroelectric effect to inorganic halide perovskites photodetectors

作者：You Xue, Tao Yang, Enhui Wang, Hongyang Wang, Laipan Zhu, Sheng Cao, Xinmei Hou, Kuo‐Chih Chou · 发表于：Nano Energy · 年份：2024 · DOI：10.1016/j.nanoen.2024.109491 · 被引用次数：46 · 研究领域：Perovskite Materials and Applications、Advanced Sensor and Energy Harvesting Materials、Engineering Applied Research

Compression and tensile strain based on piezo-phototronic effect represent a valid method for modulating the photocurrent of photodetectors . However, the underlying mechanism responsible for the asymmetric increase/decrease of photocurrent under identical compressive/tensile stresses remains unclear. Herein, a PVDF/CsPbBr 3 composite fiber incorporating orthorhombic CsPbBr 3 (a piezoelectric phase) is fabricated through room-temperature electrospinning. Subsequently, flexible photodetectors (PDs) based on PVDF/CsPbBr 3 are constructed to explore the impact of strain on photocurrent. The results reveal a 103% increase in photocurrent under a strain of −0.09% (compressive strain), significantly exceeding the 38% decrease observed under a strain of 0.09% (tensile strain). Furthermore, the piezoelectric and ferroelectric properties of the orthorhombic CsPbBr 3 are computed using density functional theory (DFT), confirming that the asymmetric modulation of photocurrent stems from the nature of the piezoelectric effect and ferroelectric effect. Additionally, the ferroelectric effect exerts a more pronounced influence on the photocurrent, which is 2.2 times greater than the piezoelectric effect. This work provides compelling evidence for the piezoelectric and ferroelectric effects of inorganic halide perovskites , underscoring the substantial potential of these effects in optoelectronic devices .