| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 101 === There are several techniques which can transit solar energy. In the study, the metal-insulator-metal device (MIM) based on the surface plasmonic effect was applied to convert solar energy with the spectrum ranges from visible to infrared into electricity. The benefit is that its absorption wavelength is tunable according to the period of its surface grating. The optoelectronic mechanism is when the light with the energy meet the surface plasmons generation, the hot carriers will be generated. These hot carriers will become photocurrent using tunneling effect or their energies are higher than the barrier.
The traditional method of generating the surface plasmon resonant (SPR) was Kretschmann configuration. In the study, we developed the planar MIM device into nano-grating structure and designed the device using the Finite Difference Time Domain (FDTD) method. The advantages of the subwavelength grating structure were not only the same
purpose of SPR generation but also the size reduction. We also investigated the SPR absorption spectrum resulted from the parameters of grating period, depth, duty cycle, light source angle and the thickness of MIM each layer. A two-beam-interference lithography was used to fabricate the nano-grating in the study. Compared with the expensive and
time-consuming E-beam lithography, it took shorter time and achieved large-area periodic nanostructure.
Finally, in the optoelectronic measurement, we observed the SPR spectrum and the optoelectronic transition phenomenon in MIM device. The efficiency of the 1D grating of MIM device was greater than planar MIM device for three orders of magnitude.
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