Electrochemical Deposition Of CuSCN And Its Application In Organic Solar Cells

In this thesis, cuprous thiocyanate (CuSCN) films were prepared by electrochemical deposition. The films of CuSCN with high density, smooth surface, good transparency are achieved by controlling the deposition conditions.The prepared CuSCN thin films were used as a hole transport layer in the organic solar cells with structure of ITO/CuSCN/P3HT:PCBM/Al. The performance of organic solar cells with CuSCN were characterized and studied. The main contents of this thesis are as follows:(1) The stable CuSCN aqueous solution was prepared by adding complexing agent EDTA. The EDTA dopped electrodeposition solution can be placed for a long time was prepared at room temperature, and showed good stability.(2) The key factors to influence the quality of depositied CuSCN films were studied. The results show that the deposition potential, Cu2+ concentration, deposition time are the main permeters to determine the surface morphology, grain size, transmittance of CuSCN films. The suitable deposition potential is between -0.1V～-0.6V by linear sweep voltammetry. When the deposition potential is below-0.6V, there will be the electric precipitation of copper to happen. Depending on scanning electron microscopy (SEM) images, we know that the lower the deposition potential is, the larger the crystal particles of deposited CuSCN films are. Found the influence of different deposition time, Cu2+ deposition concentration on the transmittance by UV vis-absorption spectra test.We also found that increasing the deposition time and Cu2+ concentration would result in the lower transmittanceand the increase in surface roughness.(3) CuSCN films were introduced to P3HT:PCBM based organic solar cells as their hole transport layers. Through the device characterization, we found that the devices show best performance at following preparing conditions:CuSO4 ·5H2O:EDTA:KSCN ratio of 1:1:0.25, Cu2+concentration of 12mmol/L in electrochemical deposition liquid and the deposition potential in -0.3V～-0.4V and deposition time of 2s.This thesis mainly studies the electrochemical deposition of inorganic materials CuSCN which is feasible as a hole transport layer of organic solar cells. The optimization technigue parameters and the specific process for making CuSCN hole transport layer were achieved at our conditions.