(color online) (a) Dark current and photocurrent of a 1.2-mm-thick MAPbBr₃ single-crystal photodetector under white-light illumination of 0.4 mW·cm⁻². Inset: repeated operation of the photodetector in the dark and under illumination of 0.4 mW·cm⁻² with a bias of −4 V. (b) EQE spectra under biases of 0, −1, and −4 V. (c) Specific detectivity (D^*) spectrum under −4-V bias. Inset: measured total noise under −4 V (black solid line), calculated shot noise limit (orange dashed line) and instrument noise floor (blue solid line). (d) Current spectrum under 570-nm LED illumination of different light intensities with a modulation frequency of 7 Hz for NEP measurement (from Ref. [32]).