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首页> 外文期刊>Nanotechnology >Improved performance of nanowire-quantum-dot-polymer solar cells by chemical treatment of the quantum dot with ligand and solvent materials
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Improved performance of nanowire-quantum-dot-polymer solar cells by chemical treatment of the quantum dot with ligand and solvent materials

机译：通过用配体和溶剂材料对量子点进行化学处理来改善纳米线-量子点-聚合物太阳能电池的性能

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We report a nanowire-quantum-dot-polymer solar cell consisting of a chemically treated CdSe quantum dot film deposited on n-type ZnO nanowires. The electron and hole collecting contacts are a fluorine-doped tin-oxide/zinc oxide layer and a P3HT/Au layer. This device architecture allows for enhanced light absorption and an efficient collection of photogenerated carriers. A detailed analysis of the chemical treatment of the quantum dots, their deposition, and the necessary annealing processes are discussed. We find that the surface treatment of CdSe quantum dots with pyridine, and the use of 1,2-ethanedithiol (EDT) ligands, critically improves the device performance. Annealing at 380°C for 2h is found to cause a structural conversion of the CdSe from its initial isolated quantum dot arrangement into a polycrystalline film with excellent surface conformality, thereby resulting in a further enhancement of device performance. Moreover, long-term annealing of 24h leads to additional increases in device efficiency. Our best conversion efficiency reached for this type of cell is 3.4% under 85mWcm ~2 illumination.
机译：我们报告了纳米线-量子点-聚合物太阳能电池，该电池由沉积在n型ZnO纳米线上的化学处理过的CdSe量子点膜组成。电子和空穴收集触点是氟掺杂的氧化锡/氧化锌层和P3HT / Au层。该器件架构可增强光吸收并有效收集光生载流子。讨论了对量子点的化学处理，其沉积以及必要的退火过程的详细分析。我们发现，用吡啶对CdSe量子点进行表面处理，以及使用1,2-乙二硫醇（EDT）配体，可以显着提高器件性能。发现在380℃下退火2小时会导致CdSe从其初始的隔离量子点排列结构转变为具有优异表面保形性的多晶膜，从而进一步提高了器件性能。而且，长时间退火24h会进一步提高器件效率。在85mWcm〜2的光照下，此类电池的最佳转换效率为3.4％。

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