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Donor-Acceptor Interfacial Interactions Dominate Device Performance in Hybrid P3HT-ZnO Nanowire-Array Solar Cells

机译:供体-受体界面相互作用主导混合P3HT-ZnO纳米线阵列太阳能电池的器件性能。

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The adsorption of self-assembled monolayers (SAMs) on metal oxide surfaces is a promising route to control electronic characteristics and surface wettability. Here, arylphosphonic acid derivatives are used to modulate the surface properties of vertically oriented ZnO nanowire arrays. Arylphosphonate-functionalized ZnO nanowires are incorporated into hybrid organic-inorganic solar cells in which infiltrated poly(3-hexylthiophene) (P3HT) serves as the polymer donor. Strong correlations between device short-circuit current density (J sc) and power conversion efficiencies (PCEs) with ZnO surface functionalization species are observed and a weak correlation in the open-circuit voltage (V oc) is observed. Inverted solar cells fabricated with these treated interfaces exhibit PCEs as high as 2.1%, primarily due to improvements in J sc. Analogous devices using untreated ZnO arrays having efficiencies of 1.6%. The enhancement in J sc is attributed to surface passivation of ZnO by SAMs and enhanced wettability from P3HT, which improve charge transfer and reduce carrier recombination at the organic-inorganic interface in the solar cells.
机译:自组装单分子层(SAMs)在金属氧化物表面的吸附是控制电子特性和表面润湿性的有前途的途径。在这里,芳基膦酸衍生物用于调节垂直取向的ZnO纳米线阵列的表面性能。将芳基膦酸酯官能化的ZnO纳米线结合到有机-无机杂化太阳能电池中,其中渗透的聚(3-己基噻吩)(P3HT)充当聚合物供体。观察到器件短路电流密度(J sc)与功率转换效率(PCE)与ZnO表面功能化物质之间的相关性很强,并且开路电压(V oc)的相关性也很弱。用这些处理过的界面制造的倒置太阳能电池的PCE高达2.1%,这主要是由于J sc的提高。使用未经处理的ZnO阵列的类似器件的效率为1.6%。 J sc的增强归因于SAM对ZnO的表面钝化,以及P3HT增强的润湿性,从而改善了电荷转移并减少了太阳能电池有机-无机界面处的载流子复合。

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