Integration of Semiconducting Sulfides for Full-Spectrum Solar Energy Absorption and Efficient Charge Separation

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• 作者：Tao-Tao Zhuang ; Yan Liu ; Yi Li ; Yuan Zhao ; Liang Wu ; Prof. Dr. Jun Jiang and Prof. Dr. Shu-Hong Yu
• 刊名：Angewandte Chemie
• 出版年：2016
• 出版时间：May 23, 2016
• 年：2016
• 卷：128
• 期：22
• 页码：6506-6510
• 全文大小：2781K
• ISSN：1521-3757

文摘

The full harvest of solar energy by semiconductors requires a material that simultaneously absorbs across the whole solar spectrum and collects photogenerated electrons and holes separately. The stepwise integration of three semiconducting sulfides, namely ZnS, CdS, and Cu_2−xS, into a single nanocrystal, led to a unique ternary multi-node sheath ZnS–CdS–Cu_2−xS heteronanorod for full-spectrum solar energy absorption. Localized surface plasmon resonance (LSPR) in the nonstoichiometric copper sulfide nanostructures enables effective NIR absorption. More significantly, the construction of pn heterojunctions between Cu_2−xS and CdS leads to staggered gaps, as confirmed by first-principles simulations. This band alignment causes effective electron–hole separation in the ternary system and hence enables efficient solar energy conversion.