Colloidal Quantum Dots Intraband Photodetectors

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• 作者：Zhiyou Deng ; Kwang Seob Jeong ; Philippe Guyot-Sionnest
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：November 25, 2014
• 年：2014
• 卷：8
• 期：11
• 页码：11707-11714
• 全文大小：540K
• ISSN：1936-086X

文摘

Photoconductivity is demonstrated with monodispersed HgSe colloidal quantum dots that are illuminated with radiation resonant with 1S_e鈥?P_e intraband electronic absorption, between 3 and 5 渭m. A doping of two electrons per dot gives the lowest dark current, and a detectivity of 8.5 脳 10⁸ Jones is obtained at 80 K. Photoluminescence of the intraband transition is also observed. The detector properties are discussed in terms of the measured photoluminescence quantum yield, the electron mobility in the 1P_e state, and the responsivity. The intraband photoresponse allows to fully harness the quantum confined states in colloidal nanostructures, extending the prior limited use of interband transition.

Keywords:

mercury selenide; colloidal quantum dots; intraband photoconductivity; intraband absorption; infrared photodetector