Ultrathin photoelectric conversion films consisting of a porphyrin-fullerene photoredox pair were fabricated by the combined use of room-temperature covalent-bonding and surface sol-gel processes. First, cysteamine was self-assembled on an indium-tin-oxide (ITO) electrode. The cysteamine-modified electrode was then immersed in C60 solution, giving immobilization of C60 via bond formation between the amino group of cysteamine and C60. Next, the C60-modified electrode was dipped in 2-ethanolamine solution to implant the hydroxy group to the immobilized C60 via the bond formation between C60 and the amino group; thus, the hydroxy group was exposed as the outermost layer. Then, Ti(OBu)4 and tetracarboxyporphyrin (TCPP) were alternately assembled on the C60 layer by the surface sol-gel process, to give an assembly of TCPP, titanium oxide species [Ti(O)], and C60 on the ITO electrode. The double layering of TCPP-Ti(O) was possible. The spectral characterization of the films was carried out. In the presence of sacrificial reagents, anodic photocurrents were generated from these modified electrodes. The incorporation of the C60 layer resulted in the substantial enhancement of the photocurrents as compared with that of the TCPP layer alone, suggesting effective electron-transfer reactions between TCPP and C60 that contribute to the photocurrent increase. The photocurrents increased by the double layering of the TCPP and Ti(O) layers.
|Number of pages||4|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Issue number||4 B|
|Publication status||Published - Apr 25 2006|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)