Photogenerated Exciton Dissociation in Highly Coupled Lead Salt Nanocrystal Assemblies

详细信息    查看全文

• 作者：Joshua J. Choi ; Justin Luria ; Byung-Ryool Hyun ; Adam C. Bartnik ; Liangfeng Sun ; Yee-Fun Lim ; John A. Marohn ; Frank W. Wise ; Tobias Hanrath
• 刊名：Nano Letters
• 出版年：2010
• 出版时间：May 12, 2010
• 年：2010
• 卷：10
• 期：5
• 页码：1805-1811
• 全文大小：465K
• 年卷期：v.10,no.5(May 12, 2010)
• ISSN：1530-6992

文摘

Internanocrystal coupling induced excitons dissociation in lead salt nanocrystal assemblies is investigated. By combining transient photoluminescence spectroscopy, grazing incidence small-angle X-ray scattering, and time-resolved electric force microscopy, we show that excitons can dissociate, without the aid of an external bias or chemical potential gradient, via tunneling through a potential barrier when the coupling energy is comparable to the exciton binding energy. Our results have important implications for the design of nanocrystal-based optoelectronic devices.