Distinctive Nanocrater Structures in Hybrid Electron‐Collecting Buffer Layers for High Efficiency Polymer:Nonfullerene Solar Cells,Advanced Materials Interfaces

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Distinctive Nanocrater Structures in Hybrid Electron‐Collecting Buffer Layers for High Efficiency Polymer:Nonfullerene Solar Cells
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-10-01 , DOI: 10.1002/admi.201800912
Jooyeok Seo ₁ , Chulyeon Lee ₁ , Hwajeong Kim _{1,

2} , Youngkyoo Kim ₁

Affiliation

Here distinctive nanocrater structures generated in the low temperature‐processed hybrid electron‐collecting buffer layers (h‐ECBLs), consisting of zinc oxide (ZnO) and poly(2‐ethyl‐2‐oxazoline) (PEOz), for high efficiency inverted‐type polymer:nonfullerene solar cells are reported. The ZnO:PEOz h‐ECBLs are prepared from their precursor films via thermal annealing at 110–130 °C, which is far lower than conventional condition (200 °C). Results show that the power conversion efficiency (PCE) of solar cells is noticeably improved by introducing the h‐ECBLs with 6 wt% PEOz but turned down at higher PEOz contents irrespective of the annealing temperature (from 9.25% to 11.41% at 120 °C and from 10.19% to 12.03% at 130 °C). The improved PCE is explained by the increased electron mobility in the h‐ECBLs (6 wt%) due to the reduced oxygen deficiency of ZnO by the PEOz components as well as the generated nanocrater (wrinkled at 120 °C) structures leading to the enhanced interfacial area and contact with the active layers.

中文翻译：

高效聚合物：非富勒烯太阳能电池的混合电子收集缓冲层中的独特纳米坑结构

在这里，低温处理的混合电子收集缓冲层（h- ECBLs）中产生了独特的纳米火山口结构，由氧化锌（ZnO）和聚（2-乙基-2-恶唑啉）（PEOz）组成，可实现高效的倒转。类型聚合物：非富勒烯太阳能电池的报道。ZnO：PEOz h -ECBLs是由其前体薄膜通过110-130°C的热退火制备的，这远低于常规条件（200°C）。结果表明，引入h可以显着提高太阳能电池的功率转换效率（PCE）。‐具有6 wt％PEOz的ECBLs，但无论退火温度如何，其PEOz含量都较高（在120°C时从9.25％降低到11.41％，在130°C时从10.19％降低到12.03％）。PCE的改善可以解释为，由于PEOz组分减少了ZnO的氧缺乏，h- ECBLs中的电子迁移率增加了（6 wt％），并且生成了纳米坑（在120°C皱纹），从而导致了增强的PCE。界面区域并与活性层接触。

更新日期：2018-10-01

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