Fabrication and characterization of dual-band organic/inorganic photodetector for optoelectronic applications
| Autor: | Mohamed Abd El Salam, H. M. Abd El-Khalek, Fatma M. Amin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Silicon business.industry General Physics and Astronomy Photodetector chemistry.chemical_element Heterojunction 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology 01 natural sciences Photodiode law.invention Field emission microscopy chemistry law 0103 physical sciences Optoelectronics General Materials Science Thin film 0210 nano-technology business Visible spectrum |
| Zdroj: | Current Applied Physics. 19:629-638 |
| ISSN: | 1567-1739 |
| DOI: | 10.1016/j.cap.2019.02.017 |
| Popis: | In this work, the optoelectronic performance of organic/inorganic heterojunction photodiode based on alpha-sexithiophene (α-6T/n-Si) is introduced. A thin film of α-6T was deposited on the n-type silicon substrate by a thermal evaporation technique. The topographical properties of the α-6T thin film grown on the n-Si substrate were investigated using a field emission scanning electron microscope (FESEM) technique. A network of nanocrystalline needles over the film surface was observed which give rise to an improvement in the electric charge transport. The optical properties of the prepared thin film were investigated using a spectrophotometric technique. The high absorption of α-6T in UV and visible region suggested the ability of this architecture for UV and visible light detection. The I-V characteristics of the fabricated photodiode were investigated in dark and under different illumination intensities and different wavelengths. The present architecture showed a good response to halogen lamb light, where the estimated values of rising and falling time at 160 mW/cm2 were about 400 ms and 450 ms, respectively. The results show the possibility of using Au/α-6T/n-Si/Al structure as a photodetector for a wide range of the solar spectrum (UV–Visible). |
| Databáze: | OpenAIRE |
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