Photoconductive Properties of MEH-PPV/CuS-Nanoparticle Composites

Photoconductive properties of photodiodes based on composites of CuS nanoparticles and Poly[2-methoxy,5-(2'-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) are investigated. By comparing composite devices with different MEH-PPV:CuS weight ratios of 1:1 (D2−1), 1:1.25 (D2−2), 1:2.5 (D2−3) and 1:5 (D2−4), it is found that the device D2−3 exhibited the best performance: the short-circuit current density of 17 μA/cm2 with the light intensity of 16.7 mW/cm2, the highest open-circuit voltage of 0.83 V, and the photosensitivity of 132 at reverse bias of -1 V. The photosensitivity is improved by a factor of 5 compared with the undoped MEH-PPV device.