| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 102 === In recent years, the efficiency of organic photovoltaic has increasing dramatically through numerous researchers’ contribution. From single layer organic photovoltaic to tandem organic photovoltaic, both the absorbance of photon and charge collection is increasing gradually. We are looking forward to producing commercial batteries.
This thesis focuses on enhancement of electron collection efficiency and photon absorbance in organic photovoltaic through thermal imprint lithography on active layer. The enhancement of photon absorbance is proved with spectrophotometer in this photovoltaic, and collaborated with the FDTD simulation. Finally, we perform optical simulation on varying the structure period from micrometer to nanometer scale. The photocurrent of device is measured under standard AM 1.5G solar spectrum for analyzing electrical property by I-V curve. Basing on the same imprint pressure, the short circuit current of depth of 10 nm grating active layer in OPV is 0.05 mA（relative improvement 6.6%） higher than planar one. The same phenomena can be found under higher imprinted pressure that the short circuit current of depth of 30 nm grating active layer in OPV is 0.118 mA （relative improvement 20%）higher than planar one. Therefore, the contribution of anti-reflection caused from imprinted micro-grating structure in OPV can enhance photocurrent more than planar one.
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