Impedance Spectroscopic Analysis of Perovskite Solar Cells
| Autor: | Ning-Yi Chang, 張寧詒 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Since 2009 to nowadays, Perovskite solar cells have a good development. Perovskite solar cells from mesoporous structures to heterojunction plane p-i-n structures have something improved. In addition to production process becoming simpler also have better efficiency. We report that flat, uniform thin films of this material can be deposited by a one-step, solvent-induced, fast crystallization method involving spin coating of a DMF solution of CH3NH3PbI3 followed immediately by exposure to chlorobenzene to induce crystallization. In the first experiment, we set different delay time (2 s/ 4 s /6 s) to drop the poor solvent. And we observed their surface topography, electrical measurement, and electrochemical impedance. In the second experiment, there are four different conditions on the Perovskite thin films. Added DMSO or not and two different spin coating transfers speeds (5000 rpm, 6000rpm). And then we observed their surface topography, electrical measurement, and electrochemical impedance. In the first experiment, we found there are many holes on the surface which delay time is 2 seconds. And its average efficiency achieves 1.17%. In addition, a little holes on the surface which delay time is 4 seconds. However, its average efficiency achieves 9.32%. At last, there are a flat thin film when the delay time is 6. Although its average efficiency only achieves 7.68%, but there are many samples’ efficiency achieve more than 10%. In the second experiment, we found that adding DMSO contribute to improving open circuit voltage and fill factor. And current density is higher when rotating speed at 6000 rpm. The electrochemical impedance is measured without illumination and the potential is 0V. We found the efficiency is higher and the recombination resistance is higher. Applied bias voltage is higher and the recombination resistance is smaller. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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