목차
1. 서론 1
2. 대표적인 반도체 전극 재료의 연구 동향 3
2.1. Si 반도체 광전극 3
2.2. GaN 반도체 광전극 4
2.3. 이상적인 반도체 광전극 재료의 필요성 5
3. 3C-SiC 반도체 광전극 5
3.1. 3C-SiC 이란? 5
3.2. 물 분해 및 이산화탄소 환원 전극을 위한 3C-SiC의 특성 5
3.3. 물 분해 전극으로의 응용 6
3.4. 이산화탄소 전극으로의 응용 8
3.5. 3C-SiC 반도체 전극 연구의 고찰 및 향후 방향 9
4. 결론 9
참고문헌 10
Table 1. Energy Densities of Various Energy Materials 2
Table 2. The Comparison of Current Efficiency for Products According to Electrode Type 4
Table 3. Physical and Electric Properties of the Representative Polytypes of SiC and Si 5
Fig. 1. The capacity to generate power of diverse renewable energy resource 1
Fig. 2. Cycle of carbon-netural solution by artificial photo synthesis 2
Fig. 3. Schematic of photoelectrochemical cell with semiconductor electrodes for water-splitting and CO₂ reduction 2
Fig. 4. The band-edge structure of some representative semiconductor materials 3
Fig. 5. Previous researches on Si photo-electrode for water splitting or CO₂ reduction. (a) Si photoanode with ultrathin Ni layer, (b) TiO₂ layer as passivation layer for Si photoanode, (c) p-Si with metal catalyst particles for CO₂ reduction,... 3
Fig. 6. Researches on GaN photoelectrode, (a) Photoelectro-chemical cell with GaN photoanode for CO₂ reduction, (b) The comparison of production amount, (c) Photocurrent and... 4
Fig. 7. The relationship between solar-to-fuel conversion efficiency and band-gap value. Red-dotted line indicates minimum band-gap for water-splitting (1.23 eV) Blue dotted line is for the band-gap of 2.3 eV 5
Fig. 8. Mott-Schottky plots for n-type 3C-SiC obtained from impedance measurement in different electrolytes. The linearly fitted line is drawn to calculate flat-band potential (VFB) (intercepts at x-axis) 6
Fig. 9. n-type 3C-SiC band-edge position as a function of pH 6
Fig. 10. (a) Schematic illustration of excited charge carrier separation in the Pt particle/3C-SiC photo-electrode through the induced potential, (b) Photocurrent density vs potential... 7
Fig. 11. (a) Pt 4f XPS spectra with fitting analysis from the samples annealed at different temperatures. The black dotted lines are the original plots from the XPS measurement and the pink lines denote the convolution of fitting curves.... 7
Fig. 12. The configuration of PEC cell for CO₂ reduction 8
Fig. 13. The evolution of products (CO and H₂) with elapsed reaction time depending on the type of counter electrode (Pt and Ag). The marks with 'Repeat' indicates the plots from the experiment of reproducibility 8
Fig. 14. The comparison of the ratio of CO to H₂ gas products 8
Fig. 15. Photocurrent density vs potential (a) highly and lightly nitrogen-doped 3C-SiC and (b) 4H-SiC, and Mott-Schottky plot for (c) highly and lightly nitrogen-doped 3C-SiC and ightly nitrogen-doped 3C-SiC and (d) 4H-SiC.... 9