Abstract
n-ZnO/p-Si heterojunction photodiodes have been fabricated by sputter deposition of n-ZnO films on p-Si substrates. Substrate temperatures of 300, 400, 500 and 600°C were used for the n-ZnO film deposition using various Ar/O2 ratios from 1:1 to 6:1. All the diodes, except for one obtained at a high substrate temperature of 600°C, show strong rectifying behavior as characterized by current-voltage (I-V) measurement in a dark room. Photoelectric effects from the diodes have been observed under illumination using monochromatic red light with a wavelength of 670 nm. High levels of photocurrent or responsivity were obtained under reverse bias conditions when the stoichiometry of n-ZnO films was improved by optimizing the process conditions, such as the substrate temperature and Ar/O2 ratio. The n-ZnO/p-Si structure prepared at 300°C was found to be unsuitable because photoelectric effects were not apparent from this structure. A heterojunction diode with n-ZnO deposited at 600°C was also found to be unsuitable because the dark leakage current was too high, even though the diode showed photoelectric effects.
Original language | English |
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Pages (from-to) | 93-98 |
Number of pages | 6 |
Journal | Thin Solid Films |
Volume | 398-399 |
DOIs | |
Publication status | Published - 2001 Nov |
Event | 28th International Conference on Metallurgia - San Diego,CA, United States Duration: 2001 Apr 30 → 2001 May 30 |
Bibliographical note
Funding Information:This work has been supported by the Brain Korea 21 project and partly supported by Korea Research Foundation (KRF) fund (2000-2-0816).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry