Precisely Tailoring Ferroelectric Photocurrent via Magnetic Spin Chain toward Efficient Self-Powered UV Photodetectors
Qiligeer Bai, Xiaoxu Bao, Chunyan He, Dan Wu, Yulong Bai, Shifeng Zhao
Abstract
The study of Aurivillius multiferroic films has become increasingly prevalent in the contents of solar energy and light-sensitive detectors. In principle, the characters of photocarrier separation driven by ferroelectric polarization can be candidates for self-powered photodetectors. In this work, magnetic Fe doping is proposed for constructing Fe–O–Fe spin chain structures, which not only serve as a scaffold for electron transport but also combine ferroelectric polarization and magnetic exchange in Bi 4 Ti 3– x Fe x O 12 ( x = 0, 0.5, 0.7, 0.8, 0.9, and 1.0) multiferroic UV photodetector. Using this approach, the precise control of the photocurrent and the performance improvement of the photoelectric readout are then realized, with a noise equivalent power of 9.8 × 10 –14 W and detectivity D * ∼ 7.2 × 10 12 Jones. Furthermore, the outstanding energy conversion of ∼3.7% under AM 1.5 G irradiation is significant for future practical self-powered detection.