| Summary: | 碩士 === 國立勤益科技大學 === 化工與材料工程系 === 100 === Graphene exhibits good electron conductivity, thermal conductivity and strength. Graphene may become the new electron conductivity material in place of silicon in the future. Graphene may be made as the conductive layer for flexible display and polymer solar cell due to its conductivity, transparent and toughness.
In this study, we prepared PEDOT:graphene hole transport layer by the molar ratio of Imidazole: Fe(OTs)3: EDOT is 2:1.75:1 using chemical oxidation polymerization. The graphene was added with weight ratio of graphene/EDOT from 0 to 0.1. The electron conductivity and charge transpost properties of hole transport layer was improved by adding graphene. We investigate the effect of nano TiO2 or oleic acid (OA) added into the active layer on the characteristics of organic solar cell device.
We used the SPM, α-step, Contact Angle Meter, FE-SEM, Four-Point Probe, FT-IR, UV-Vis and solar simulator to measure the roughness, thickness, contact angle, surface pattern, sheet resistance, the change of functional groups, absorbance and power conversion efficiency, respectively. The results show that the PEDOT:graphene hole transport layer with 0.05 content of graphene has the lowest resistivity by spin coating at 4000rpm and baking at 130℃ for 10min. The roughness of surface increased with increasing the content of graphene. From FE-SEM observation, the aggregation of graphene increased with the content of graphene and leaded to a decrease of electron conductivity.
The device with the configuration of ITO/PEDOT:PSS/P3HT:PCBM/Al have open circuit voltage of 0.016V and power conversion efficiency of 0.00003%, respectively. The hole transport layer of device is PEDOT:graphene with 0.05 content of graphene, the open circuit voltage increased from 0.016V to 0.537 V and the increase is 0.521V, the power conversion efficiency increased from 0.00003% to 0.00059%.
The device with graphene content of 0.05 in hole transport layer and TiO2 nanoparticles of weight ratio of 0.5 was added into the P3HT:PCBM active layer, its short-circuit current increased to 0.2405mA, its power conversion efficiency increased to 0.0277%. The device which its active layer with OA and ratio of P3HT:PCBM:OA is 1 mg: 1 mg: 2μl, its short circuit current increased to 0.8753mA, its power conversion efficiency increased to 0.0679%. These results show that the active layer with OA has higher power conversion efficiency than that of with TiO2.
Keywords: graphene, polymer solar cell, power conversion efficiency.
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