| Abstract |
| Glass/FTO/compact TiO2/mesoporous TiO2/perovskite layer dispersed MgO nanopowder structured samples were prepared from a mixture of CH3NH3PbI3 (methylammonium lead iodide, MAPbI3) and MgO with a sol-gel process involving PbI2+MgO and CH3NH3I (methylammonium iodide, MAI). The phase and color change of MAPbI3 with MgO was examined by XRD and micro-Raman analyses, and by using a uv-vis-nir-colorimeter. Optical microscopy and field emission scanning electron microscopy (FE-SEM) were employed to evaluate the evolution of the microstructure. The XRD analysis confirmed that MAPbI3 with MgO added degrades more slowly compared to MAPbI3 alone due to Mg(OH)2 formation. Micro-Raman analysis results showed only the existence of MAPbI3. Optical microscopy and FE-SEM revealed degradation in color and microstructural change in all samples as time passed. However, the degradation was confirmed to occur more slowly for the MAPbI3 with added MgO. A lab color analysis with uv-vis-nir also supported the results of the color changes by degradation. These results indicate that the degradation of MAPbI3 may be dramatically delayed by the addition of nano MgO powders. (Received November 03, 2014) |
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| Key Words |
| MgO, CH3NH3PbI3, degradation, perovskite solar cells |
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