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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Optimization of ZnO Nanorod Array Morphology for Hybrid Photovoltaic Devices
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Optimization of ZnO Nanorod Array Morphology for Hybrid Photovoltaic Devices

机译：混合光伏器件ZnO纳米棒阵列形貌的优化

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摘要

Hybrid inorganic oxide/conjugated polymer photovoltaic devices using Zfib nanorod arrays (NRAs) instead of planar films as the electron-transport layer exhibit significant improvements in performance that have been attributed to increased heterojunction surface area, although the relationship has not been quantitatively established. Here, we independently measure the surface area of ZnO NRAs and quantify its effect on the performance of ZnO NRA/poly(3-hexylthiophene) (P3HT) photovoltaic devices. We find that a device utilizing a vertically aligned 180 nm ZnO NRA exhibits an ~2.7× enhancement in the short-circuit current compared with that of a bilayer device, in excellent agreement with the increase in surface area. In addition, we show that a subtle difference in the NRA morphology can impact P3HT crystallinity in the photoactive region. Improved P3HT crystallinity leads to an ~25% enhancement in the short-circuit current for devices with the same surface area. On the basis of these findings, we modify the NRA growth to introduce more spacing between nanorods and create a ZnO NRA/P3HT device with a high short-circuit current density of 2.91 mA/cm~2. These results indicate that, although increased surface area is the most important factor to improving photocurrent and efficiency, other factors, such as ZnO NRA morphology and P3HT crystallinity, also impact the performance of ZnO/P3HT photovoltaic devices.
机译：使用Zfib纳米棒阵列（NRA）代替平面膜作为电子传输层的混合无机氧化物/共轭聚合物光伏器件，虽然由于尚未定量建立关系，但由于异质结表面积的增加，其性能显着提高。在这里，我们独立地测量ZnO NRA的表面积，并量化其对ZnO NRA /聚（3-己基噻吩）（P3HT）光伏器件性能的影响。我们发现，与双层器件相比，利用垂直排列的18​​0 nm ZnO NRA的器件在短路电流方面表现出〜2.7倍的增强，与表面积的增加极为吻合。此外，我们显示NRA形态上的细微差异会影响光敏区域中的P3HT结晶度。 P3HT结晶度的提高导致具有相同表面积的器件的短路电流提高了约25％。基于这些发现，我们修改了NRA的生长以在纳米棒之间引入更多的间距，并创建了具有2.91 mA / cm〜2的高短路电流密度的ZnO NRA / P3HT器件。这些结果表明，尽管增加表面积是提高光电流和效率的最重要因素，但其他因素（例如ZnO NRA形态和P3HT结晶度）也会影响ZnO / P3HT光伏器件的性能。

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