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[求助]
纳米zno/聚合物复合材料制备光伏器件研究
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Fig. 5 shows the UVeVis absorption spectra of P3HT, ZnO and P3HT/ZnO thin films. It can be seen that P3HT shows strong absorption in the visible wavelength from 425 to 625 nm. P3HT shows two intrachain pep* absorption peaks at 526 and 560 nm and a low energy shoulder at 606 nm associated with interchain interactions in the crystalline polymer. The spectrum of the P3HT/ ZnO composites film shows a e 49 nm blue shift in peak of the UVeVis spectrum and does not show discernible long wavelength absorption shoulder. The photoluminescence (PL) quenching can be the evidence of the photo-induced charge transfer and efficiency of the charge generation occurring in P3HT/ZnO composites films. Fig. 6 shows the PL spectra of P3HT, P3HT/ZnO composites film. ZnO can act as electron acceptor when blended with P3HT, and the excited electron transfers from P3HT polymer to adjacent ZnO which leads to fluorescence quenching. P3HT shows an emission peak at wavelength of 660 nm. The PL emission intensity decreases from 57 to 13 for P3HT/ZnO composites film which is about more than 77% of PL due to fast deactivation of the excited state by the electron-transfer reaction. This implies not quantitative, charge- generation efficiency. Therefore, in the P3HT/ZnO composites film absorbs more photons from light, and the interface area between the components also increased. As a result, the excitations can be more efficiently separated to electrons and holes, which cause the decrease of the PL. |
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sltmac
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2楼2011-07-12 16:23:05
sltmac
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【答案】应助回帖
qxgr6110(金币+60, 翻译EPI+1): 满意 2011-07-12 16:50:55
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图5是P3HT, ZnO和P3HT/ZnO薄膜的紫外可见吸收光谱。可以看到P3HT在425nm到624nm的可见波长范围内有很强的吸收。P3HT分别在526nm和560nm显示了两个链内吸收峰，由于晶体聚合物的链内反应导致在606nm有较低的能肩。P3HT/ZnO复合薄膜的谱图显示了49nm的蓝移，但没显示出很明显的长波段吸收能肩。PL谱可以作为发生在P3HT/ZnO复合薄膜内光致电荷迁移以及电荷转换效率的证据。 图6是P3HT, ZnO和P3HT/ZnO复合膜的的PL谱图。当与P3HT复合时，ZnO可以作为电子捕获物质，电子从P3HT聚合物激发到邻近的ZnO中从而形成荧光。P3HT在660nm处有一发射峰，P3HT/ZnO复合膜的PL发射强度从57减小到13，PL谱的改变超过77%是由于电子迁移反应引发的激发态快速失活引起的。这意味着电荷转换效率无法定量。因此，P3HT/ZnO复合膜会吸收更多的光子，组分间的接触面积也大增。结果，电子-空穴对的分离效率得到提高，这也导致了PL谱的降低。 |
3楼2011-07-12 16:45:34
