The study of perovskite formation by CH3HN2 gas reacted with PbI2 thin films
| Autor: | Chung-Yi Hsu, 許中奕 |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 My research included two parts. Firstly, using PbI2 thin films react with CH3NH2 gas to fabricate MAPbI3 thin films and it aims to understand the composition of the thin films. Secondly, we study the effect of the solvent vapor annealing method to treat MAPbI3 thin films to enhance their crystal quality. It aims to fabricate MAPbI3 thin films with larger grain size, good coverage, and better surface flatness. In the first part, the analysis by XPS and XRD indicate that PbI2 reacts with CH3NH2 gas can produce MAPbI3. Besides, the main side product is PbI(OH). In the second part, the analysis by XRD indicates the composition of the MAPbI3 thin film is unchanged after solvent vapor annealing treatment. Moreover, MAPbI3 thin films treating by dehydrate methylamine gas via solvent vapor annealing method can have bigger grain size and less defects. However, the film coverage is not good enough for device applications. Hence, we use polymers to modify the substrate surface to increase the interaction between substrate and MAPbI3 thin films, which improve the coverage of MAPbI3 thin film on the substrate. Among the polymers investigated (PVA, PEI, and PVP), all modifications can effectively improve the surface coverage. Further apply solvent vapor annealing treatments, surface morphology of the MAPbI3 thin films are greatly improved. Among them, MAPbI3 films with substrate surface modified by PVP and then treated by CH3NH2 gas can have mirror-like surface flatness. Our results suggest that the combination of substrate surface modification and further solvent vapor annealing can be an effective method for the fabrication of high quality perovskite solar cells. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|