scholarly journals Model of intrinsic carrier concentration of strained Si/(001）Si1－xGex

2010 ◽  
Vol 59 (3) ◽  
pp. 2064
Author(s):  
Song Jian-Jun ◽  
Zhang He-Ming ◽  
Hu Hui-Yong ◽  
Dai Xian-Ying ◽  
Xuan Rong-Xi
Keyword(s):  
Carrier Concentration ◽  
Strained Si ◽  
Intrinsic Carrier Concentration

Intrinsic Carrier Concentration in Strained Si1-XGex/(101)Si

2010 ◽  
Vol 663-665 ◽  
pp. 470-472 ◽  
Author(s):  
Jian Jun Song ◽  
He Ming Zhang ◽  
Hui Yong Hu ◽  
Xian Ying Dai ◽  
Rong Xi Xuan
Keyword(s):  
Band Structure ◽  
Carrier Concentration ◽  
Device Physics ◽  
Strained Si ◽  
Intrinsic Carrier Concentration ◽  
Materials Properties ◽  
Densities Of States ◽  
Valence Bands

The intrinsic carrier concentration is the important parameter for researching strained Si1-xGex materials properties and evaluating Si-based strained devices parameters. In this paper, at the beginning of analyzing the band structure of strained Si1-xGex/(101)Si, the dependence of its effective densities of states for the conduction and valence bands (Nc, Nv) and its intrinsic carrier concentration (ni) on Ge fraction (x) and temperature were obtained. The results show that ni increases significantly due to the effect of strain in strained Si1-xGex/(101)Si. Furthermore, Nc and Nv decrease with increasing Ge fraction (x). In addition, it is also found that as the temperature becomes higher, the increase in Nc and Nv occurs. The results can provide valuable references to the understanding on the Si-based strained device physics and its design.

Enhancement of Intrinsic Carrier Concentration in the Active Layer of Solar Cell Using Indium Nitride Quantum Dot

2015 ◽  
Vol 793 ◽  
pp. 435-439 ◽  
Author(s):  
M.A. Humayun ◽  
M.A. Rashid ◽  
F. Malek ◽  
S.B. Yaakob ◽  
A.Z. Abdullah ◽  
...  
Keyword(s):  
Solar Cell ◽  
Quantum Dot ◽  
Carrier Concentration ◽  
Density Of States ◽  
Active Layer ◽  
Cell Structure ◽  
Indium Nitride ◽  
Effective Density ◽  
Intrinsic Carrier Concentration ◽  
Solar Cell Structure

This paper presents the improvement of intrinsic carrier concentrations in the active layer of solar cell structure using Indium Nitride quantum dot as the active layer material. We have analyzed effective density of states in conduction band and valance band of the solar cell numerically using Si, Ge and InN quantum dot in the active layer of the solar cell structure in order to improve the intrinsic carrier concentration within the active layer of the solar cell. Then obtained numerical results were compared. From the comparison results it has been revealed that the application of InN quantum dot in the active layer of the device structure improves the effective density of states both in conduction band and in the valance band. Consiquently the intrinsic carrier concentration has been improved significently by using InN quantum dot in the solart cell structure.

Thermoelectric Mapping of Nanostructures

2002 ◽  
Author(s):  
Ho-Ki Lyeo ◽  
C. K. Ken Shih ◽  
Uttam Ghoshal ◽  
Li Shi
Keyword(s):  
Carrier Concentration ◽  
Field Effect Transistors ◽  
Semiconductor Industry ◽  
Semiconductor Nanostructures ◽  
Semiconductor Processing ◽  
Strained Si ◽  
Wide Range ◽  
Impurity Doped ◽  
Processing Techniques ◽  
Made In

There is intense interest to develop nanowires [1] and superlattices [2] that may offer superior thermoelectric figure of merit for efficient energy conversion. Meanwhile, the advance of semiconductor processing techniques has yielded impurity-doped semiconductor nanostructures with a doped region as small as a few nanometers. These include shallow junction Si field-effect transistors, strained Si/SiGe/Ge heterostructures and quantum dots, III-V heterostructures, and doped nanowires and nanotubes. Due to various size confinement effects, these doped semiconductor nanostructures often have unique electrical, optoelectronic, or thermoelectric properties that may lead to a wide range of applications. In contrast to the progress made in synthesizing thermoelectric nanostructures and in fabricating doped semiconductor nanostructures, the ability to quantify thermoelectric property and carrier concentration in comparable length scale has been lagging behind. For example, the 1997 U.S. Roadmap of Semiconductors from the Semiconductor Industry Association (SIA) defines the need for nanometer-scale measurements of carrier concentration profiles [3]. Though progress has been made, currently no technique can satisfy the requirements posted by the SIA roadmap due to the lack of either spatial resolution or accuracy.

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