Hybrid photovoltaic cells are defined as a combination of nanostructures of inorganic semiconductor as an electron acceptor and organic polymer semiconductor as an electron donor. This solar cell is getting interesting and attractive in recent years due to its potential advantages such as low cost synthesis, easy processability and variable manufacturing of thin film devices. The current key issues in this field are how to enhance the exciton dissociation yield and separated-carrier transporting rate.[1,2]
Herein, we introduce highly aligned TiO2 nanofibers with good crystalline property as an electron acceptor material to improve the electron dissociation and transporting in hybrid solar cells. Aligned TiO2 nanofibers array was prepared by electrospinning synthesis equipped with rotating disk collector. To investigate the photovoltaic properties with respect to the degree of aligning and number of layer, hybrid solar cells were fabricated by a combination of the poly[2-methoxy, 5-(2’-ethylhexyloxy)-1,4-phenylenevynylene] (MEH-PPV) and the ordered 1D architectures, which was compared with the cases of flat TiO2 thin film and randomly collected TiO2 nanofibers. These solar cells are analyzed through various analyses such as photoluminescence (PL), UV-vis spectroscopy and solar performance test along with the structural analyses of synthesized TiO2 nanofibers by using X-ray diffraction (XRD), X-ray absorption near edge structure (XANES), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The detail characteristics will be described and discussed.

References
1. S. Günes, H. Neugebauer and N. S. Sariciftci, Chem. Rev., 2007, 107, 1324.
2. J. Bouclé, P. Ravirajan and J. Nelson, J. Mater. Chem., 2007, 17, 3141.