Figure 3.

Operation Mechanism of Self-Powered ZnO NWs/SnS Photodetector

(A) Schematic diagram of the pyro-potential inside ZnO NW and a typical cycle of I-t curve under VIS illumination (λ = 690 nm).

(B) Energy-band diagram and the photoexcitation at the local ZnO/SnS heterojunction.

(C) Energy-band diagram of the device upon VIS illumination, indicating pyro-phototronic effect on the device performance.

(D) Energy-band diagram of the device when turning off the VIS light illumination, leading to decreased temperature inside ZnO NWs and reverse pyroelectric current.

(E) Schematic diagram of the thermo-potential inside SnS film and a typical cycle of I-t curve under UV illumination (λ = 365 nm).

(F) Energy-band diagram of the device upon UV illumination, indicating thermo-phototronic effect on the device performance.

See also Figures S1 and S7–S10.