The flexophotovoltaic effect (FPVE) in two-dimensional (2D) materials offers a promising route for optoelectronic energy conversion, yet the interplay between flexoelectric polarization and electronic/optical properties remains elusive. Here, we reveal that strain-gradient engineering in bent ${\mathrm{MoSi}}_2{\mathrm{N}}_4$ nanoribbons with varying widths not only induces self-doping and a nonzero Berry curvature dipole that drives shift current, but also enables an outstanding flexoelectric power conversion efficiency (PCE) of $9.05\%$, leading among 2D FPVE systems. Moreover, we demonstrate a self-powered FPVE photodetector that generates spin-polarized photocurrent, including pure spin current, without external bias. These findings establish strain-tailored ${\mathrm{MoSi}}_2{\mathrm{N}}_4$ as a unified platform for high-efficient photovoltaics, optoelectronics, and spintronics, driven solely by mechanical bending.

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• Photocurrent
• Photovoltaic effect
• Spin optoelectronics
• 2-dimensional systems
• First-principles calculations