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Highly Stable Colloidal 'Giant' Quantum Dots Sensitized Solar Cells

机译：高度稳定的胶体“巨型”量子点敏化太阳能电池

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摘要

Colloidal quantum dots (QDs) are widely studied due to their promising optoelectronic properties. This study explores the application of specially designed and synthesized "giant" core/shell CdSe/(CdS)(x) QDs with variable CdS shell thickness, while keeping the core size at 1.65 nm, as a highly efficient and stable light harvester for QD sensitized solar cells (QDSCs). The comparative study demonstrates that the photovoltaic performance of QDSCs can be significantly enhanced by optimizing the CdS shell thickness. The highest photoconversion efficiency (PCE) of 3.01% is obtained at optimum CdS shell thickness approximate to 1.96 nm. To further improve the PCE and fully highlight the effect of core/shell QDs interface engineering, a CdSexS1-x interfacial alloyed layer is introduced between CdSe core and CdS shell. The resulting alloyed CdSe/(CdSexS1-x)(5)/(CdS)(1) core/shell QD-based QDSCs yield a maximum PCE of 6.86%, thanks to favorable stepwise electronic band alignment and improved electron transfer rate with the incorporation of CdSexS1-x interfacial layer with respect to CdSe/(CdS) 6 core/shell. In addition, QDSCs based on "giant" core/CdS-shell or alloyed core/shell QDs exhibit excellent long-term stability with respect to bare CdSe-based QDSCs. The giant core/shell QDs interface engineering methodology offers a new path to improve PCE and the long-term stability of liquid junction QDSCs.
机译：胶体量子点（QDs）由于其有希望的光电特性而被广泛研究。这项研究探索了特殊设计和合成的“巨型” CdSe /（CdS）（x）CdS壳厚度可变的Qds的应用，同时将其核尺寸保持在1.65 nm，作为QD的高效，稳定的光收集器敏化太阳能电池（QDSC）。对比研究表明，通过优化CdS外壳厚度，可以显着提高QDSC的光伏性能。在最佳CdS壳厚度约为1.96 nm时，可获得3.01％的最高光转换效率（PCE）。为了进一步改善PCE，并充分强调核/壳QDs界面工程的效果，在CdSe核和CdS壳之间引入了CdSexS1-x界面合金层。结合后的良好的逐步电子带取向和改进的电子传输速率，所得的合金化CdSe /（CdSexS1-x）（5）/（CdS）（1）核/壳QD基QDSC产生的最大PCE为6.86％。 CdSexS1-x界面层相对于CdSe /（CdS）6核/壳的折射率。另外，基于“巨型”核/ CdS-壳或合金核/壳QD的QDSC相对于裸露的基于CdSe的QDSC表现出出色的长期稳定性。巨大的核/壳QD接口工程方法论为改善PCE和液接QDSC的长期稳定性提供了一条新途径。

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  • 来源
    《Advanced Functional Materials》 |2017年第30期|1701468.1-1701468.14|共14页
  • 作者

    Selopal Gurpreet S.; Zhao Haiguang; Tong Xin; Benetti Daniele; Navarro-Pardo Fabiola; Zhou Yufeng; Barba David; Vidal Francois; Wang Zhiming M.; Rosei Federico;

  • 作者单位

    Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China|Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China|Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China|Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

    Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China;

    Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China|Inst Natl Rech Sci, Ctr Energie Mat & Telecommun, 1650 Boul Lionel Boulet, Varennes, PQ J3X 1S2, Canada;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    interface engineering; long-term stability; photovoltaics; quantum dots; solar cells;

    机译：界面工程长期稳定性光伏量子点太阳能电池;

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