Boosting the Performance of Environmentally Friendly Quantum Dot-Sensitized Solar Cells over 13% Efficiency by Dual Sensitizers with Cascade Energy Structure
Boosting the Performance of Environmentally Friendly Quantum Dot-Sensitized Solar Cells over 13% Efficiency by Dual Sensitizers with Cascade Energy Structure
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Boosting%20the%20Performance%20of%20Environmentally%20Friendly%20Quantum%20Dot-Sensitized%20Solar%20Cells%20over%2013%%20Efficiency%20by%20Dual%20Sensitizers%20with%20Cascade%20Energy%20Structure
DOI：
10.1002/adma.201903696
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发表时间：
2019-10-17
影响因子：
29.4
通讯作者：
Jen, Alex K. -Y.
中科院分区：
文献类型：
--
作者：
Pan, Zhenxiao;Yue, Liang;Jen, Alex K. -Y.
通常，高的光捕获效率、电子注入效率和电荷收集效率是高效量子点敏化太阳能电池（QDSC）的先决条件。然而，单一QD敏化剂同时满足这三个要求是相当困难的。结果表明，通过采用具有级联能量结构的Zn-Cu-In-Se和Zn-Cu-In-S双量子点敏化剂，可以很好地平衡这些参数。实验结果表明：i）双量子点的组合可以提高细胞的光捕获能力，特别是在可见光窗口：ii）共敏化方法可以促进电子注入，这得益于所使用的两种量子点敏化剂的级联能量结构;由于量子点在二氧化钛上的覆盖率提高，电荷复合过程受到抑制，电荷收集效率显著提高。因此，这种共敏化策略提供了一个新的认证效率记录的12.98%的液体结QDSC下AM 1.5G 1太阳照射。此外，所构建的电池在高湿度环境中表现出良好的稳定性。
Generally, high light-harvesting efficiency, electron-injection efficiency, and charge-collection efficiency are the prerequisites for high-efficiency quantum-dot-sensitized solar cells (QDSCs). However, it is fairly difficult for a single QD sensitizer to meet these three requirements simultaneously. It is demonstrated that these parameters can be felicitously balanced by a cosensitization strategy through the adoption of environmental-friendly Zn-Cu-In-Se and Zn-Cu-In-S dual QD sensitizers with cascade energy structure. Experimental results indicate that: i) the combination of the dual QDs can improve the light-harvesting capability of the cells, especially in the visible light window; ii) the cosensitization approach can facilitate electron injection, benefitting from the cascade energy structure of the two QD sensitizers employed; iii) the charge-collection efficiency can be remarkably enhanced by the suppressed charge-recombination process due to the improved QD coverage on TiO2. Consequently, this cosensitization strategy delivers a new certified efficiency record of 12.98% for liquid-junction QDSCs under AM 1.5G 1 sun irradiation. Moreover, the constructed cells exhibit good stability in a high-humidity environment.