| Summary: | 碩士 === 國立勤益科技大學 === 化工與材料工程系 === 104 === Flexible solar cell has many advantages, for example flexible feature, light weight and low cost. Therefore, we can prepare the solar cell on PET plastic substrate. In this study, we added inorganic metal nanoparticles in the flexible organic solar cells to enhance the power conversion efficiency. Molybdenum(VI) oxide (MoO3) has special structure to act as the battery material, catalysts, electrochromic and optical materials in wide range of applications. In this study, the MoO3 was added in the organic solar cells by different method. Firstly, we mixed conducting liquid PEDOT: PSS with MoO3 in different volume ratio 1:1, 1:2, 1:3, 1:4, 1:5 as the hole transport layer (HTL). Secondly, the MoO3 was incorporated between PEDOT:PSS and active layer. We used two donor of P3HT and PCPDTBT to increase the absorbance of active layer. We investigated the effect of different addition methods of MoO3 on the photoelectric performance of cell. The device structures were (A) PET/ITO/PEDOT:PSS:MoO3 /P3HT:PC61BM/Ca/Al, (B) PET/ITO/PEDOT:PSS:MoO3/P3HT: PCPDTBT:PC61BM/Ca/Al and (C)PET/ITO/PEDOT:PSS/MoO3/P3HT: PCPDTBT:PC61BM/Ca/Al. We compared the absorbance, roughness, PL quenching property, and power conversion efficiency (PCE) of these devices.
In the cell of structure (A) which MoO3 nanoparticles were added in the HTL, we found that the fill factor and power conversion efficiency (PCE) of the cells were always higher than those of the cell without MoO3. The cell with PEDOT:PSS:MoO3 composition of 1:3 volume ratio had the highest short-circuit current density (Jsc) of 9.41 mA/cm2 and PCE of 2.74%. The increases of Jsc and PCE were 10% and 39%, respectively.
In the cell of structure (B), we added PCPDTBT into active layer and the composition of active layer was P3HT:PCPDTBT:PCBM by weight ratio of 1:0.04:1. The cell with PEDOT:PSS:MoO3 volume ratio of 1:3 had the highest Jsc of 9.61 mA/cm2 and PCE of 3.11%. The increases of Jsc and PCE were 12% and 58%, respectively.
In the cell of structure (C), MoO3 was inserted between hole transport layer and active layer by different composition and the composition of active layer was P3HT:PCPDTBT:PCBM by weight ratio of 1:0.04:1. The cell with 0.50M MoO3 layer exhibited the highest Jsc of 9.62 mA/cm2 and PCE of 2.94%. The increases of Jsc and PCE were 14% and 38%, respectively.
The cell of structure (B) with the hole transport layer composition of PEDOT:PSS:MoO3 of 1:3 volume ratio exhibited the highest PCE of 3.11% among these cells. From these result, we found that the additions of MoO3 into the hole transport layer and PCPDTBT into the active layer can increase the photovoltaic performance of flexible polymer solar cell.
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