Fabrication And Characterization Of Hybrid Solar Cells Based On One-Dimensional ZnO Nanomaterials

Organic-inorganic hybrid solar cell (HSC), a kind of novel thin-film solar cell, is attracting widespread attention in academic research in recent years. However, owing to the low absorbing efficiency of light and the high recombination rate of charge carriers, HSC has not yet reached high efficiency value. In this context, a systematic study is performed on improving the power conversion efficiency (PCE) of HSC through optimizing the preparation technology of the active layer as well as the preparation and component of solar cells. Some achievements that have acquired so far are shown as follows.(1) The vertically aligned ZnO nanorods (NRs) are grown on the ZnO dense layer through hydrothermal process. And the ZnO dense layer is prior obtained by mean of sol-get method. As a result, the ZnO dense layer has a thickness of100nm. The average diameter of ZnO NRs is100nm. The length of ZnO NRs can be adjusted from100nm to800nm.(2) The electron donor polymer, P3HT, is deposited on the top of ZnO films by spin coating. The process of drying slow can play a crucial role on improving the nano-contact of heterojunction. As a consequence, the highest PCE of device is0.22%through drying slow.(3) D205dye is employed as surface modification to overcome the problems mentioned above. By means of UV-vis spectra and incident photons to current conversion efficiency show that absorption efficiency of light and the power conversion efficiency are improved. And a PCE value of0.98%is obtained. (4) ZnO nanocrystalline aggregates are utilized to modify the ZnO dense layer, leading to an additional25%of the amount of dye adsorption. In the end, the maximum PCE of1.30%is obtained through the synergistic effect of ZnO nanocrystalline aggregates and D205dye.The research has important guiding significance for improving the performance of organic-inorganic hybrid solar cells.