| AVS 63rd International Symposium & Exhibition | |
| Surface Science | Thursday Sessions |
| Session SS-ThM |
| Session: | Chirality and Enantioselectivity on Surfaces; Ionic Liquid Interfaces |
| Presenter: | Shi Bai, Tokyo University of Technology, Japan |
| Correspondent: | Click to Email |
[Introduction] A solution of the loss of heat by using black dye in a dye-sensitization solar cell is expending the width of the light absorbing wavelength by growing multi-dye with narrow wavelength to reduce the loss of heat. So, we supply and make the molecules grow according to the reaction between the molecules, and apply the multi-dye layer film by using Liquid-Phase Molecular Layer Deposition. By way of LP-MLD, the multi-dye layer forms on the surface of ZnO, and we test the expansion effect of the photocurrent spectrum width.
[Growth of multi-dye layer film]First, adsorb the p-type dye(Rose Bengal)molecules p1 on the surface. Because there is no reaction between the same molecules, and they don't combine each other. So the first layer is completed on the surface of the substrate which the surface is filled with p1.Second, remove the p1 by IPA(isopropyl alcohol), then supply the n1,molecules of n-type dye(Brilliant Green).p1 and n1 react and they combined. The same as step 1,the p1 layer is filled with n1,then the second layer is completed. Step 3 is using p-type dye(Eosin Y) molecules again. Repeat these steps, adsorb the molecules in the array as designed, and complete the multi-dye molecule layer film.
[Measurement of the photocurrent in LP-MLD]LP-MLD is a technology using the combination power between molecules of p-type dye and molecule of n-type dye to make a layer. Use IPA as the solvent to make a solution with the concentration of 1.6 x 10-2mol/L. Set the substrate in a cell,inject the cell with IPA until the cell is full of it. Then inject the solution of p1 to make the dye molecules adsorbed by the substrate. After 20 minutes, in order to remove p1 solution in the cell, inject the cell with IPA again. After putting the laser on the substrate and measuring the photocurrent, repeat the process with other dye solution. Base on the measurement, the expansion effect of the photocurrent spectrum width was deduced.