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Influence of humidity for preparing sol-gel ZnO layer: Characterization and optimization for optoelectronic device applications

机译：湿度对制备溶胶-凝胶ZnO层的影响：光电器件应用的表征和优化

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摘要

Sol-gel zinc oxide (ZnO) is very useful for constructing various optoelectronic devices including different types of sensors and solar cells at low cost and fast processing time. Here, we adopted a zinc acetate dehydrate, with low processing temperature and suitable for flexible electronics, as a precursor to produce ZnO thin film. Then, we explored the morphological and optical properties of various sol-gel ZnO layers depending on the humidity of the sol-gel process because the humidity affects the morphological and optical characteristics, dramatically changing the performance of optoelectronic devices. As a result, extremely high humidity produced a ZnO layer with rough surface, high dispersive transmittance, and high trap density because rapid hydrolysis does not give atoms enough time to move to thermodynamically-stable sites. On the other hand, extremely low humidity produced a ZnO layer with smooth surface, low dispersive transmittance and oxygen-deficient trap sites owing to insufficient hydrolysis. Therefore, a ZnO layer prepared at humidity of 25% had low surface roughness, low trap density, and desirable transmittance characteristics, achieving the best device performance when applied to organic solar cells. This study will be helpful in determining the optimum processing conditions to obtain optoelectronic devices with the best performance.
机译：溶胶-凝胶氧化锌（ZnO）对于以低成本和快速处理时间来构造包括不同类型的传感器和太阳能电池的各种光电设备非常有用。在这里，我们采用了加工温度低，适用于柔性电子产品的脱水醋酸锌作为生产ZnO薄膜的前体。然后，我们探索了各种溶胶-凝胶ZnO层的形态和光学特性，这取决于溶胶-凝胶工艺的湿度，因为湿度会影响其形态和光学特性，从而极大地改变了光电器件的性能。结果，极高的湿度会产生具有粗糙表面，高分散透射率和高陷阱密度的ZnO层，因为快速水解不能使原子有足够的时间移动到热力学稳定的位置。另一方面，由于水解不足，极低的湿度产生了具有光滑表面，低分散透射率和缺氧陷阱位的ZnO层。因此，在25％的湿度下制备的ZnO层具有低的表面粗糙度，低的陷阱密度和期望的透射率特性，当应用于有机太阳能电池时实现了最佳的器件性能。这项研究将有助于确定最佳的加工条件，以获得具有最佳性能的光电器件。

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  • 来源
    《Applied Surface Science》 |2020年第may15期|145660.1-145660.8|共8页
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    Kumoh Natl Inst Technol Dept Mat Sci & Engn Gumi 39177 Gyeongbuk South Korea;

    Kyungpook Natl Univ Sch Architectural Civil Environm & Energy Engn Daegu 41566 South Korea;

    Kyungpook Natl Univ Dept Polymer Sci & Engn Daegu 41566 South Korea;

    KIMS Dept Adv Funct Thin Films Chang Won 51508 South Korea;

    Kumoh Natl Inst Technol Adv Mat Res Ctr Gumi 39177 Gyeongbuk South Korea;

    Kumoh Natl Inst Technol Dept Mat Sci & Engn Gumi 39177 Gyeongbuk South Korea|Kumoh Natl Inst Technol Adv Mat Res Ctr Gumi 39177 Gyeongbuk South Korea;

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  • 正文语种 eng
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  • 关键词

    Sol-gel method; Zinc oxide; Thin film; Humidity; Organic solar cells;

    机译：溶胶-凝胶法氧化锌薄膜;湿度;有机太阳能电池;

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