Using LPD-TiO2 Nanorods Array and Dye to Improve the Inverted Heterojunction Solar cell

This thesis is about using P3HT:PCBM as the active layer in different kinds of organic bulk heterojunction solar cell structures, including conventional structure, inverted structure, inverted structure hybrid with dye, inverted structure having nanorods array.
In the fabricating of conventional structure cell, the introducing of a long time pre-annealing process solved the structure damage caused by solvent, which hard to vaporize from organic layers completely. And the convention efficiency was improved from 0.2% to more than 2%. In the fabricating of inverted structure cell, the introducing of a short time post-annealing process eliminated the contact resistant between e-gun evaporated Ag and organic layer. And the convention efficiency was improved from 0.03% to more than 2%. In the fabricating of the inverted structure cell hybrid with N719, N719 modified the surface of TiO2 and enhance the yield rate. And the average conversion efficiency was improved from 1.86% to 2.1%. In the fabricating of inverted structure cell having nanorods array, water bath method was introduced to get ZnO nanorods array. And TiO2 nanorods array was obtained by converting the ZnO nanorods template with LPD method. However, this kind of structure had unsolved contact problem between layers, and finally its conversion efficiency was less than 0.4%
All the fabricating processes above are cheap, simple, and can be used in large areas producing.