کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
78464 | 49332 | 2012 | 5 صفحه PDF | دانلود رایگان |
We demonstrate experimentally that an appropriate combination of the layer thicknesses in an inverted P3HT:PCBM cell leads to an optical interference such that the EQE amounts to 91% of IQE. We observe that reflectivity between layers is minimized in a wavelength range of more than 100 nm. In that range the EQE closely matches the IQE. The role played by the optical interference in improving the performance of the fabricated solar cells is confirmed by EQE calculated numerically using a model based on the transfer matrix method. Additionally, we observed that a similar cell with an active material 1.7 times thicker exhibited a lower PCE. The poor photon harvesting in the later cell configuration is attributed to an EQE that amounts only to 72% of the IQE.
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► Optical interference to match the EQE to the IQE in an organic solar cell.
► Device multilayer stack optimization to reduce sunlight reflection.
► This effect enables devices with active layers thinner than the absorption length.
Journal: Solar Energy Materials and Solar Cells - Volume 104, September 2012, Pages 87–91