Enhanced photocurrent from organic polymers-based photodiodes by blending PbS colloidal quantum dots
Na Zhao1, Shengyi Yang, Li Zhang
1Lab of Nanophotonics Materials and Technology, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
Abstract:
Enhanced photocurrent from organic polymer-based photodiodes by blending PbS colloidal quantum dots (CQDs) are presented. The absorption spectra of nanocomposites of PbS CQDs and organic polymers, Poly[2-methoxy-5-(2'-ethylhexyloxy-pphenylenevinylene)] (MEH-PPV) and [6,6]-phenyl-C61-butyric acid methylester (PCBM), are the superposition of those of pristine constituents, indicating the absorption of the PbS CQDs contributes to the effective near-infrared light absorption for the photodiodes. The enhanced photocurrent for photodiodes made of MEH-PPV:PCBM:PbS is attributed to the excitons dissociation at the interfaces of PbS/MEH-PPV and PbS/PCBM, as well as charge transport in MEH-PPV and PCBM.
