Abstract In addition to the phase-separated morphology of donor and acceptor, the internal field created by work-function difference between cathode and anode can also influence the exciton dissociation probability. In this study, we have demonstrated enhanced photovoltaic performance by increasing exciton dissociation efficiency. To improve both work-function modification effect and charge transport properties, we have incorporated novel carbon quantum dots (CQD) having NH2 ligands into the polyethyleneimine (PEI) work-function modifying layer as a dopant. A study of net photocurrent density as a function of effective voltage showed that devices with a CQD-doped PEI layer had a much higher charge separation probability compared to devices with a pristine PEI layer. A Kelvin-probe force microscopy study demonstrated that a CQD-doped PEI layer induced lower work-function of ITO than that of ITO with a pristine PEI, which induced a stronger internal field. This strengthened internal field induced better exciton dissociation efficiency, thereby improving solar cell performance.

中文翻译：

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通过聚合物太阳能电池中的碳量子点掺杂功函数改性层提高激子解离效率

摘要 除了供体和受体的相分离形貌外，阴极和阳极之间功函数差异产生的内场也会影响激子解离概率。在这项研究中，我们通过提高激子解离效率证明了增强的光伏性能。为了改善功函数改性效果和电荷传输特性，我们将具有 NH2 配体的新型碳量子点 (CQD) 作为掺杂剂加入到聚乙烯亚胺 (PEI) 功函数改性层中。对作为有效电压函数的净光电流密度的研究表明，与具有原始 PEI 层的器件相比，具有 CQD 掺杂的 PEI 层的器件具有更高的电荷分离概率。开尔文探针力显微镜研究表明，与具有原始 PEI 的 ITO 相比，CQD 掺杂的 PEI 层诱导的 ITO 功函数更低，从而诱导更强的内部场。这种增强的内场诱导了更好的激子解离效率，从而提高了太阳能电池的性能。