Chalcopyrite-type CuInSe2 (CIS) nanoparticles were successfully synthesized by Se powder, CuCl, and InCl3 as raw materials and water as solvent at room temperature based on the principles of simultaneous equilibrium. The size of nanoparticles ranges from 20 to 50 nm in diameter. The crystalline structure and morphology of the CIS nanoparticles were characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy analysis (XPS), and transmission electron microscopy (TEM). The CIS nanoparticles were further enhanced after heat treatment at 500 °C for 2 h. The CIS film was fabricated by a mixture of CIS nanoparticles and novolac resin with a weight percentage of 30% by spin coating. The photoelectrical properties of such CIS films were measured and the results show an incident light density of 7.63 mW cm-2 with the bias voltage of 0.4 V, and the current density could approach 4.10 mA/cm2 giving an on/off switching ratio of 2.0.
- Photoelectrical properties
- Room temperature