P2.0.16 Solar Driven Zinc Oxide Based Heterojunctions for Gas Sensing Applications
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P2.0 Metal Oxide-based Sensors
- A. Gad, M. Hoffmann, T. Leuning, H. Shen, S. Mathur - Institute of Inorganic Chemistry, University of Cologne (Germany), J. Prades - Department of Electronics, University of Barcelona (Spain), F. Hermandez-Ramirez - Department of Advanced Materials for Energy Applications, Catalonia Institute for Energy Research (IREC) (Spain)
- 1312 - 1315
Zinc oxide-based heterojunctions are promising material systems for optoelectronic devices to overcome the challenges of growing stable p-type ZnO. In this work, CdS@n-ZnO/ p-Si nanowires heterojunctions were fabricated through a combination of wet-chemical etching (Si NWs) and atomic layer deposition (ZnO) techniques followed by chemical bath deposition (CdS). The electrical properties of the obtained heterojunctions were evaluated by analysing current-voltage (I–V) and capacitance-voltage (C–V) characteristics. The (I-V) characteristics in dark conditions at room temperature exhibited diode characteristics, while solar light illumination shifts the I-V characteristics to a photovoltaic effect. The sensing properties, tested under solar simulated light, toward oxidizing gases, showed a good and reproducible sensing response toward oxygen gas at room temperature. These heterojunction-based devices are potential candidates for the development of a new generation of solar driven gas sensors.