Highly sensitive detection and imaging of ultraviolet-B light for precisely controlling vitamin D generation in the human body

Abstract

A highly sensitive photodetector with selective response to UV-B photons in air is firstly demonstrated in this work. The quite low noise current of ∼2 × 10⁻¹⁴ A Hz^−1/2 allows an accurate detection of UV-B photons of 31.8 nW cm⁻² intensity with detectivity of >4 × 10¹⁴ Jones. All the figures of merit in our PDs show promising potential in quantitative detection of UV-B for precisely controlling vitamin D generation.