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Tuning indium tin oxide work function with solution-processed alkali carbonate interfacial layers for high-efficiency inverted organic photovoltaic cells

机译:利用溶液处理的碱金属碳酸盐界面层调节铟锡氧化物的功函数,以用于高效反向有机光伏电池

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摘要

Selective electron collection by an interfacial layer modified indium tin oxide cathode is critically important for achieving high-efficiency inverted structure organic photovoltaic (OPV) cells. Here, we demonstrate that solution-processed alkali carbonates, such as Li_2CO_3, Na_2CO_3, K_2CO_3, Rb_2CO _3, Cs_2CO_3, are good interfacial layer materials. Both carbonate concentration and annealing conditions can affect cathode work function and surface roughness. By proper optimization, different alkali carbonates can be almost equally effective as the cathode interfacial layer. Furthermore, good device performance can be achieved at a low annealing temperature (<50 ° C), which allows for potential applications in solution-processed inverted OPV cells on plastic substrates. This work indicates that alkali carbonates, not just cesium carbonate, are valid choices as the cathode interlayer in inverted OPV devices.
机译:通过界面层改性的铟锡氧化物阴极进行的选择性电子收集对于实现高效的反向结构有机光伏(OPV)电池至关重要。在这里,我们证明了固溶处理的碱金属碳酸盐,例如Li_2CO_3,Na_2CO_3,K_2CO_3,Rb_2CO_3,Cs_2CO_3是良好的界面层材料。碳酸盐浓度和退火条件均会影响阴极功函数和表面粗糙度。通过适当的优化,不同的碱金属碳酸盐几乎可以与阴极界面层同样有效。此外,可以在较低的退火温度(<50°C)下实现良好的器件性能,从而有可能在塑料基板上的溶液处理倒置OPV电池中潜在应用。这项工作表明,碱金属碳酸盐,而不只是碳酸铯,是倒置OPV器件中阴极夹层的有效选择。

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