Fig. 2.

Effect of light intensity, deposition time, and applied potential on the growth of Se–Te lamellar films. All films were grown under linearly polarized, 625-nm illumination from an LED source. (A–C) Films grown for 500 s at E = −0.40 V vs. SCE with light intensities of (A) 2.8 mW/cm², (B) 5.6 mW/cm², and (C) 11.3 mW/cm². (D–F) Films grown at E = −0.40 V vs. SCE and with a light intensity between 18.6 and 18.9 mW/cm² for deposition times of (D) 500 s, (E) 1,000 s, and (F) 3,000 s. (G–I) Films grown with a light intensity between 18.6 and 18.8 mW/cm² until −1.3 C/cm² of charge had passed at (G) E = −0.40 V, (H) E = −0.60 V, and (I) E = −0.80 V vs. SCE. [Scale bar: 1 µm (applies to all images).]