p-n Heterojunction on ordered ZnO nanowires/polyaniline microrods double array.
Qunwei Tang1, Lin Lin, Xuan Zhao
1Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29201, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 7, 2012
Summary
Researchers developed a novel p-n heterojunction using polyaniline microrods and ZnO nanowires. This ordered double-array structure shows promise for highly sensitive photodetectors and future nanoelectronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Semiconductor Physics
Background:
- Growing interest in nano- and microscaled heterojunctions for advanced electronic devices.
- Need for efficient p-n diodes in optical, optoelectronic, and microelectronic applications.
Purpose of the Study:
- To fabricate an ordered double-array p-n heterojunction.
- To characterize its properties for potential applications in photodetectors.
Main Methods:
- Controlled electrochemical deposition to create p-type polyaniline microrods and n-type ZnO nanowires.
- Extensive chemical and physical characterizations of the fabricated heterojunction.
Main Results:
- Successful attainment of an ordered double-array p-n heterojunction.
- Demonstrated good rectifying characteristics.
- Observed a minimum rectification ratio at 93 mW cm(-2) illumination density, indicating high sensitivity.
Conclusions:
- The developed double-array p-n heterojunction is suitable for high-sensitivity photodetectors.
- This research opens new avenues for efficient p-n heterojunction diodes.
- The structure can serve as building blocks for future nanoelectronics.
Related Concept Videos
01:11P-N junction
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
01:16Biasing of P-N Junction
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...