Fig. 2: Optoelectronic responses with AlSb NCs using photoelectrochemical measurements.

a Schematic of photoelectrochemical measurement system. A potentiostat module combined with platinum and Ag/AgCl electrodes was utilized for the measurement. The working electrode was directly connected to the ITO layer with a metal clip as the return electrode in the system. The device area of ~1 cm² was illuminated and modified artificial cerebrospinal fluid was used as the supporting solution. b Photovoltage transient response under the illumination of 445 nm and 630 nm light pulses with trains of 20 ms, 100 mW cm⁻². Blue and red semi-transparent areas show the 445 nm and 630 nm light illumination periods, respectively. c Photocurrent transient response (black) and charge evolution (purple) under the same conditions as b. The gray dashed box marks the region that is shown in d. d Close-up for the best photocurrent performance under blue light illumination (445 nm) to identify the rise time, capacitive and Faradaic components of the photocurrent response. e Photocurrent and f charge amounts generated by control (gray) and biointerface (black) under different illumination intensities of 20 ms, 445 nm pulses (means ± s.e.m., means ± s.d., n = 6).