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Bulk photovoltaic effect in MoSe2 and Janus MoSSe sliding ferroelectrics

Roumita Roy1,*, Giuseppe Cuono2, and Silvia Picozzi1,2

  • *Contact author: roumita95@gmail.com
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Phys. Rev. B 113, 165427 – Published 27 April, 2026

DOI: https://doi.org/10.1103/2pvc-zj4c

Abstract

We present a first-principles study of the nonlinear optical properties of sliding ferroelectric bilayers based on MoSe2 and Janus MoSSe. Two Janus configurations are considered: (i) one bilayer where the two intralayer polarizations caused by Janus chemical asymmetry cancel each other out, yielding photocurrent spectra comparable to pristine MoSe2 bilayers; (ii) another bilayer where the intralayer polarizations add up, for which the photoresponses are strongly enhanced. Our results show that photocurrent generation in the polar Janus structures is predominantly governed by vertical chemical asymmetry, with limited dependence on the sliding direction. These findings highlight complementary design strategies: interlayer sliding enables sensitivity to external tuning, while the Janus intralayer polarization enhances photoresponses in the visible range. The interplay between composition and stacking therefore provides a versatile platform for tailoring light-matter interactions in two-dimensional ferroelectric materials.

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Phys. Rev. B 113, 165427– Published 27 April, 2026
  • Received 3 December 2025
  • Revised 16 March 2026
  • Accepted 31 March 2026
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