Imaging Schottky Barriers and Ohmic Contacts in PbS Quantum Dot Devices
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- 作者：David B. Strasfeld ; August Dorn ; Darcy D. Wanger ; Moungi G. Bawendi
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：February 8, 2012
- 年：2012
- 卷：12
- 期：2
- 页码：569-575
- 全文大小：470K
- 年卷期：v.12,no.2(February 8, 2012)
- ISSN：1530-6992
文摘
We fabricated planar PbS quantum dot devices with ohmic and Schottky type electrodes and characterized them using scanning photocurrent and photovoltage microscopies. The microscopy techniques used in this investigation allow for interrogation of the lateral depletion width and related photovoltaic properties in the planar Schottky type contacts. Titanium/QD contacts exhibited depletion widths that varied over a wide range as a function of bias voltage, while the gold/QD contacts showed ohmic behavior over the same voltage range.<br>