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Influence of nanoscale morphology in small molecule organic solar cells

机译：纳米形态对小分子有机太阳能电池的影响

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Organic Solar Cells were fabricated by co-evaporation of C_(60):Cu-Phthalocyanine blend films in vacuum on poly(ethylene dioxythiophe-ne):polystyrene sulfonic acid (PEDOT:PSS) coated indium-tin oxide substrates. At 80 nm blend film thickness external quantum efficiencies of up to 58% were recorded. Two different methods were applied to manipulate the morphology of the active film: Current treatment of solar cells improved the power conversion efficiency to about 2.0%. Treated cells were shown by scanning electron microscopy to contain agglomerates with approximately 30 nm diameter. As a second approach the influence of substrate temperature during deposition on the film morphology was examined by scanning probe microscopy. The morphology changed from amorphous films at room temperature to structure sizes of approximately 300 nm at 145±6℃. Solar cells performance reached a power conversion efficiency of 2.1% when deposited at a substrate temperature of 51.5±2.5℃. We conclude that film morphologies with structures around 30 nm are advantageous for device efficiency as opposed to both amorphous films and larger structure sizes.
机译：有机太阳能电池是通过在聚（乙烯二氧噻吩-ne）：聚苯乙烯磺酸（PEDOT：PSS）涂覆的铟锡氧化物基底上真空共蒸发C_（60）：Cu-酞菁共混膜而制得的。在80 nm混合膜厚度下，记录的外部量子效率高达58％。应用了两种不同的方法来控制有源膜的形貌：当前对太阳能电池的处理将功率转换效率提高到约2.0％。通过扫描电子显微镜显示处理过的细胞包含直径约30nm的附聚物。作为第二种方法，通过扫描探针显微镜检查了沉积过程中衬底温度对薄膜形态的影响。形态从室温下的非晶膜变为145±6℃下约300nm的结构尺寸。在51.5±2.5℃的衬底温度下沉积时，太阳能电池的性能达到了2.1％的功率转换效率。我们得出的结论是，与非晶膜和较大的结构尺寸相反，具有约30 nm结构的膜形态对于器件效率是有利的。

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