Enhancing the Photovoltaic Performance of Perovskite Solar Cells by Addition of Cellulose Derivatives in Photoconversion Layer.
| Autor: | Hsiang-Yi Chu, 朱祥溢 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In this study, cellulose (hydroxyethylcellulose, HEC) was used as an additive and doped into perovskite precursor solution to improve the crystal sizes of perovskite layer and photovoltaic (PV) performances of perovskite solar cells (PSCs). By adjusting doped content of HEC and thermal annealing temperature of perovskite layer, to obtained shiny smooth perovskite films with excellent electronic quality, avoiding the creation of unwanted defects during crystallization process, for example, pinholes and grain boundaries. The arichitecture of HEC based inverted PSC was ITO/PEDOT:PSS/Perovskite:HEC/PC61BM/Ag. The power conversion efficiency (PCE) of 8.96%, a short-circuit current density (Voc) of 0.88 V, a short-circuit current (Jsc) of 15.23 mA/cm2, and a fill factor (FF) of 66.8% were obtained for the HEC based PSC. In addition, chloro-deoxy-hydroxyethylcellulose (CDHC) and bromo-deoxy-hydroxyethylcellulose (BDHC) were synthesized and used as the additives of perovskite layer. PV properties of CDHC and BDHC incorporated PSCs were better than that HEC incorporated PSC. The presence of chloride and the bromide ions in the perovskite layer suppressed the crystalline rate of perovskite, whih result in the larger size of crystals in the perovskite layer. This is due to the difference of electron negativity between chloride (or bromide) ion of celleulose derivative and iodide ion of PbI2. The highest PCE (11.03%), Voc (1.01V), Jsc (17.57mA/cm2), and FF (62.1%) were obtaind for the CDHC incorporated PSC. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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