We report the photoelectric properties and structural changes of ZnO nanoparticles (∼63 nm) under pressures of up to 22.9(5) GPa using in situ Raman spectroscopy, photocurrent measurements, and theoretical calculations. The ZnO nanoparticles show enhanced photocurrent (2.8 mA) and responsivity (4.78 × 106 mA W–1) under 365 nm irradiation in the wurtzite (B4) phase. On the contrary, the rock-salt (B1) phase, emerging post the wurtzite phase, exhibits a smaller band gap and decreased absorption coefficient, leading to reduced photocurrents and responsivity. These findings highlight the potential of high-pressure modulation to optimize the photoelectronic properties of ZnO nanoparticles for electronic device applications.
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Liu et al. (2024) studied this question.
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