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. 2015 Sep 25;6:8401. doi: 10.1038/ncomms9401

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(a) I–t characteristics of the self-powered ZPH PDs under 325 nm (top) and 442 nm (bottom) laser illuminations through an optical chopper with a time ratio of 1:1 at 100 Hz. (b) Enlarged plot of a single output period as shown in a for both 325- and 442-nm illuminations, divided into four stages, labelled as ‘I', ‘II', ‘III' and ‘IV'. (c) Schematic illustration of the working mechanism of pyroelectric effect-combined photoexcitation processes, corresponding to the four stages labelled in b.