The Synthesis Of CdSe Nanocrystals And Its Application In Solar Cells

In recent years, organic solar cells research got great progress. P3HT: PCBM as organic solar cells were active layer, researchers in hard working of improve the efficiency of the cells, nowadays to around10%, but with a view to organic materials PCBM as electron acceptor relative inorganic material is in a weak position, so people started to research the inorganic and organic compound of solar cells. Inorganic material such as ZnO, CdTe, CdSe, CdS, etc as electron acceptor holds a large advantage, can overcome the efficiency of electric charge caused by heating limited, and can provide high electronic transfer rate, so the researchers began to make all kinds of different inorganic semiconductor nanocrystal used in compound solar cells.Nowadays photovoltaic devices limit the efficiency of conversion factors are mainly to the response of the solar spectrum device range, the spread of excitons born light, the light of the solution of the excitons born from the effective collection, and so on, carriers, including device to the sun is restricted by the scope of the response spectrum efficiency of conversion of the most fundamental factors, to broaden the photovoltaic device of spectral response is to increase the range of organic solar photovoltaic device efficiency of conversion effective means. At present the solar spectrum response to broaden the device of the common means the scope is laminated structure, will response range of different two or more devices through the link layer in series, this method is a certain degree of the device to improve performance, but the preparation techniques complex, greatly improving the device manufacturing costs, while poor stability, further improved.This paper main job is to:First of all, is the preparation of material. This thesis we preparation CdSe as electron acceptor, and to study them. The organic solvent method for hot CdSe quantum dots, study the absorption spectrum, CdSe quantum dot size and reunion. In the synthesis of CdSe quantum dot after that we on the ligand exchange, get the performance is good quantum dots. For synthetic quantum dots, we and the characterized.Next, were studied not ligand exchange and ligand exchange of quantum dot photovoltaic device performance. And then we carry on the analysis to large size quantum dots, especially the large size of the quantum dot on the effect of organic solar cells. Finally, we make solar cell in different conditions, and analyze its performance and reason.