| Summary: | 碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 96 === Photo-lithography is employed to define the anode graph of the indium tin oxide (ITO) glass substrate. The glass substrate is then placed into acetone, methanol and DI water with ultrasonic vibration in proper order. The glass substrate is then dried with N2 and placed into an oven for baking for 30 minutes.After that, the glass substrate is placed into an O2 plasma cleaning machine with 90 sccm oxygen at RF power of 150 W to clean the ITO surface. The sample is taken out and spin-coated with a PEDOT:PSS layer on the ITO surface.The smooth ITO surface is then reconditioned with PSS to facilitate hole transportation. The derivative of C60, [6,6]-phenyl C61-butyric acid methyl ester (PCBM), and 3-hexylthiophene (P3HT) were dissolved in o-Dichlorobenzene (DCB) solvent 24 hours, then spin-coated in Glass/ITO/PEDOT:PSS as active layer for polymer solar cells. The experimental parameters were studied carefully to obtain the optimum power conversion efficiency (PCE), including the mixing organic solution、 spin-coating speed、drying conditions、control the saturate/ unsaturated vapor pressure of active layer and the doping concentration of glycerol in PEDOT:PSS (G-PEDOT:PSS), etc. Using Mixed Solvent and Changing Spin-coating Parameters to Increase the Efficiency of Organic Solar Cells. The PCE increased from 0.44 to 1.3 %. In the drying procedure of active layer, the saturated/unsaturated vapor pressure of DCB solvent was adjusted by controlling the solvent amount inside a half open capacity. With an optimum drying procedure, the PCE of polymer solar cell can be increased from 1.36 to 1.79%. Effects of saturate/unsaturated vapor pressure of Self-organization. Controlling the active layer growth rate results in an increased carrier mobility and decrease series resistance. Together with increased absorption in the active layer, this results in much-improved device performance. By two-steps with optimum rotation speeds in the spin-coating of active layer, the surface uniformity can be improved then the PCE increased from 2.53 to 3.13%. Finally, by mixing 6 % glycerol into the PEDOT:PSS solution to increase the conductivity of PEDOT:PSS, the PCE can be further increased to 5.07%. Then the device is completed, put into the device to glove box to encapsulation treat. Trying different of encapsulation manner and discuss the effects of lifetime and efficiency for device. In this study, we compare the power conversion efficiency and half-life for the encapsulation process of devices. The plastic glue adhesions, with three different kinds of UV glues, were provided by ITRI. For solar cells without encapsulation, the initial PCE = 3.76%. After encapsulation of UV glue, the efficiency can reach up to 4%, the half-life time is about 16~17 hours. The encapsulation of LED glue (5023 B), the efficiency can reach up to 4.82% and the half-life time is about 16~18 hours. The encapsulation of LED glue (5022 T), the efficiency can reach up to 6% and the half-life time in increased to 26~28 hours. Finally, the encapsulation of EVA glue, the efficiency can reach up 6.33 % and the life time in increased to 90 hours.
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