Preparation and characterization of ZnO/graphene nanocomposite for improved photovoltaic performance
Zinc oxide (ZnO) nanoparticles and ZnO/graphene (ZG) nanocomposite were synthesized via simple chemical route and its application as a photoanode for dye-sensitized solar cell (DSSC) was demonstrated. The prepared ZnO and ZG were structurally characterized by X-ray diffraction and micro-Raman techniques. The scanning electron micrograph of ZG revealed the spherical-shaped ZnO nanoparticles of particle size ~160 nm was anchored on the two-dimensional graphene sheets. UV–Vis absorption spectroscopy showed that the ZG nanocomposite has enriched visible light absorption. The DSSCs were fabricated using the synthesized ZnO and ZG nanocomposite as photoanode and the effect of low-cost organic dyes on the photovoltaic performances of the solar cells were investigated. Comprehensive performances of ZG are better than that of ZnO-based DSSCs. The ZG DSSCs show power conversion efficiency (PCE) of 1.5 and 0.98 % for RB and EY sensitized electrodes, respectively. Moreover, the ZG dominates in many aspects due to the presence of graphene.
KeywordsZnO Nanocomposite Graphene Micro-Raman Solar cells Energy conversion
This work was financially supported by DST-PURSE Programme of Madurai Kamaraj University. The authors thank DST-FIST for providing Powder XRD facility, UGC-UPE for providing micro-Raman and solar simulator facilities. The authors PJ & JM acknowledge Mr. Suresh, School of Energy Science, Madurai Kamaraj University for his assistance in I–V measurement.
- Shahzad N, Pugliese D, Lamberti A, Sacco A, Virga A, Gazia R, Bianco S, Shahzad MI, Tresso E, Pirri CF (2013) Monitoring the dye impregnation time of nanostructured photoanodes for dye sensitized solar cells. J Phys Conf Ser 439:012012/1–012012/12Google Scholar
- Zhao N, Cheng X, Zhou Y, Yang M, Yang J, Zhong T, Zheng S (2014) Synthesis of flexible free-standing silver nanoparticles–graphene films and their surface-enhanced Raman scattering activity. J Nanopart Res 16:2335/1–2335/11Google Scholar