Pristine materials, solar cells

In another work, Nogueira et al presented a covalent modification approach with thiophene groups located at the edges and defects of SWCNTs in order to modify the interaction with the polymer matrix with the aim of its application in solar cells. Raman spectra of the pristine SWCNTs, purified material (SWCNT-COOH) and the modified material (SWCNT-THIOP) were obtained. For the non-purified SWCNT, at least four distinct tube radii were observed in the Raman spectrum excited with a wavelength of 632.8 nm. The main peak for the RBMs occurs at 162 cm (1.4 nm diameter), whereas... 

Very similar results were obtained in diffusion bilayer solar cells using pyridyl-substituted pyrrolidinofullerenes (PyFs) as electron acceptor components in combination with ZnPc. To fabricate such cells, a concentrated PyF solution was spin coated on top of the evaporated ZnPc layer. Investigation of the obtained bicomponent systems showed that ZnPc becomes partially dissolved under the fabrication conditions. This results in the formation of a diffusion bilayer architecture with the intermediate layer composed of coordination complexes PyF- -ZnPc arranged in between the layers of pristine PyF and ZnPc materials (Figure 41a). Molecular structure of similar coordination complexes of PyFs was proven by X-ray single crystal diffraction. On the contrary, the reference material PCBM does not dissolve phthalocyanine underlayer and does not form any coordination complexes with ZnPc. Therefore, solution deposition of PCBM on the top of ZnPc gives a truly bilayer device. 

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