ZnTe/ZnSe (Core/Shell) Type-II Quantum Dots: Their Optical and Photovoltaic Properties
ZnTe/ZnSe (Core/Shell) Type-II Quantum Dots: Their Optical and Photovoltaic Properties
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DOI：
10.1021/cm9027995
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发表时间：
2010-01-12
影响因子：
8.6
通讯作者：
Kim, Sungjee
中科院分区：
文献类型：
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作者：
Bang, Jiwon;Park, Juwon;Kim, Sungjee
报道了一系列胶体ZnTe/ZnSe（核/壳）量子点的合成。由于独特的ii型特征，它们的发射范围可以在一个扩展的波长范围内，显示出从蓝色到琥珀色的光致发光（PL）。PL寿命长达77 ns，这清楚地表明ii型特性。ZnTe/ZnSe（核/壳）量子点可以通过ZnS层进一步钝化，在水中呈现，同时保持光学和化学稳定性，从而证明了它们在“无毒”生物或医学应用方面的潜力，无需担心重金属泄漏。ZnTe/ZnSe ii型QD/聚合物混合有机太阳能电池也被展示出来，这是一种很有前途的环保光伏器件。ZnTe/ZnSe ii型量子点光电器件的功率转换效率是对照ZnSe量子点器件的11倍。这是由于ii型量子点宽吸收唇向外延伸的波长和空间分离的ii型激子，从而增强了载流子的提取。我们相信基于ZnTe/ znse的ii型波段工程可以为开发安全材料选择开辟许多新的可能性。
Synthesis of a size series of colloidal ZnTe/ZnSe (core/shell) quantum dots (QDs) is reported. Because of the unique Type-II characters, their emission can range over an extended wavelength regime, showing photoluminescence (PL) from blue to amber. The PL lifetime measures as long as 77 ns, which clearly indicates the Type-II characteristics. ZnTe/ZnSe (Core/Shell) QDs can be further passivated by ZnS layers, rendered in water, while preserving the optical and chemical stabilities and thus proved their potentials toward "nontoxic" biological or medical applications that are free from concerns regarding heavy-metal leakage. ZnTe/ZnSe Type-II QD/polymer hybrid organic solar cells are also showcased, promising environmentally friendly photovoltaic devices. ZnTe/ZnSe Type-II QD incorporated photovoltaic devices show 11 times higher power conversion efficiency, when compared to that of the control ZnSe QD devices. This results from the Type-II characteristic broad QD absorption Lip to extended wavelengths and the spatially separated Type-II excitons, which call enhance the carrier extractions. We believe that ZnTe/ZnSe-based Type-II band engineering can open many new possibilities as exploiting the safe material choice.