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Novel post-synthesis purification strategies and the ligand exchange processes in simplifying the fabrication of PbS quantum dot solar cells

机译：简化PBS量子点太阳能电池制造的新型合成后纯化策略和配体交换过程

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摘要

Quantum dots (QDs) solids with iodide passivation are a key component for most of the well-performing PbS QDs solar cells. Usually, iodide passivation of oleic acid (OA) capped PbS QDs films is achieved by a solid-state ligand exchange process using tetrabutylammonium iodide (TBAI). This ligand exchange process has generally been reported to be incomplete, especially in higher thicknesses, affecting the properties of the films adversely, producing inconsistent results in the device structures fabricated. The present study is based on a systematic investigation of the TBAI exchange on PbS QDs films and the performance of the resulting solar cells. We could achieve a complete TBAI exchange in a sufficiently thick (similar to 240 nm) and dense QDs film deposited by a minimum number of coating steps, through the optimization of the number of post-synthesis washing cycles on the QDs. Detailed studies were carried out investigating the effect of the number of washing cycles on the quantity of OA before and after the exchange, the ligand exchange efficiency, the development of trap states and the resulting photovoltaic device performance. A power conversion efficiency of 5.55% was obtained for a device subjected to an optimum number of washing cycles.
机译：具有碘化物钝化的量子点（QDS）固体是大多数良好性PBS QDS太阳能电池的关键部件。通常，通过使用四丁基碘化氢（TBAI）的固态配体交换方法实现油酸（OA）封端的PBS QDS膜的碘化物钝化。该配体交换过程一般据报道，特别是在更高的厚度上不完整，不利地影响薄膜的性质，在制造的器件结构中产生不一致的结果。本研究基于对PBS QD膜的TBAI交换的系统研究以及所得的太阳能电池的性能。我们可以通过优化QDS上合成后洗涤循环的数量的优化，在足够厚（类似于240nm）和沉积的致密QD膜中，通过优化QDS后的合成后洗涤循环的数量来实现完整的TBAI交换。进行详细研究，研究了交换前后OA的洗涤循环数量的效果，配体交换效率，捕集效率的开发和所得的光伏器件性能。获得5.55％的功率转换效率对于经受最佳洗涤循环的装置。

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  • 来源
    《RSC Advances》 |2020年第51期|共9页
  • 作者

    Tom Anju Elsa; Thomas Ajith; Ison V. V.;

  • 作者单位

    St Thomas Coll Res &

    PG Dept Phys Ctr Nanobiopolymer Sci &

    Technol Palai 686574 Kerala India;

    St Thomas Coll Res &

    PG Dept Phys Ctr Nanobiopolymer Sci &

    Technol Palai 686574 Kerala India;

    St Thomas Coll Res &

    PG Dept Phys Ctr Nanobiopolymer Sci &

    Technol Palai 686574 Kerala India;

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  • 正文语种 eng
  • 中图分类 化学;
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