Reversible GaInP2 Surface Passivation by Water Adsorption: A Model System for Ambient-Dependent Photoluminescence

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• 作者：James L. Young ; Henning Döscher ; John A. Turner ; Todd G. Deutsch
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：March 3, 2016
• 年：2016
• 卷：120
• 期：8
• 页码：4418-4422
• 全文大小：324K
• ISSN：1932-7455

文摘

The photoluminescence (PL) intensity of semiconductors can be modulated by their ambient. We show GaInP₂ to respond reversibly to water vapor, irreversibly to oxygen, and with a time dependence to air. We characterize the reversible PL response to water vapor in a set of steady-state measurements that reveal a systematic dependence on pressure. We derive a model for this behavior based on Langmuir adsorption and Shockley–Read–Hall recombination principles to describe how partial pressure controls luminescence. The expression for the GaInP₂/water vapor system shows excellent agreement to measurements. Combined, the PL monitoring technique and model demonstrate a quantitative approach for probing gas/surface defect interactions of semiconductor processing steps, luminescence-based sensors, and photocatalytic surfaces.