Near Infrared Photodetectors Based on Solution – Phase Synthesis of FeS2 Nanocrystals
Autor: | 王耀霆 |
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Rok vydání: | 2010 |
Druh dokumentu: | 學位論文 ; thesis |
Popis: | 98 In this thesis, the near infrared photodetectors based on FeS2 nanocrystals were studied. We used FeS2 nanocrystals as the active layer and ZnO as blocking layer for the devices. FeS2 is a indirect band gap semiconductor which has a narrow band gap of 0.95 eV with high absorption to the light even near-infrared range, and the advantage in using the FeS2 nanocrystals is because they are low-cost, abundant and non-toxic materials. The well dispersed FeS2 nanocrystals were synthesis by Solution –phase methods, furthermore, we could control the shapes of FeS2 nanocrystals by adjust the ratio of surfactant to solvent, then the crystal morphology and structure were identified by TEM and XRD. In conclusion, the photodetectors based on FeS2 nanocrystals response in both the visible and infrared ( λ > 715 nm) have been demonstrated by Current density–voltage characteristics and temporal photocurrent response of the devices. |
Databáze: | Networked Digital Library of Theses & Dissertations |
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