Design criteria for the ‘hi’ doping density in hi-lo high-efficiency impatts

1976 ◽  
Vol 12 (13) ◽  
pp. 329 ◽  
Author(s):  
P.A. Blakey
Keyword(s):  
High Efficiency ◽  
Design Criteria ◽  
Doping Density

Effects of Oxygen During Close-Spaced Sublimation of CdTe Solar Cells

1996 ◽  
Vol 426 ◽  
Author(s):  
D. H. Rose ◽  
D. S. Albin ◽  
R. J. Matson ◽  
A. B. Swartzlander ◽  
X. S. Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Partial Pressure ◽  
High Efficiency ◽  
Cdte Film ◽  
Doping Density ◽  
Cdte Solar Cells ◽  
High Efficiency Solar Cells ◽  
Nucleation Sites ◽  
Partial Pressures ◽  
Effect Of Oxygen

AbstractThe presence of oxygen during close-spaced sublimation (CSS) deposition of CdTe has been regarded as necessary for high-efficiency CdS/CdTe solar cells. To date, research has focused on the effect of oxygen on the acceptor density in the CdTe absorber. We find that although oxygen may influence the doping density, a perhaps more significant effect is its influence on nucleation and growth of the film. Oxygen partial pressures of 0 to 24 torr and total pressures of 5 to 45 torr (balance He) have been explored for CSS depositions. We find that increasing the O2 partial pressure increases the density of CdTe nucleation sites, thereby suppressing pinhole formation and likely reducing defects at the junction. However, increasing O2 also tends to decrease grain size and faceting in the films. In addition to influencing the film properties, O2 adversely affects the source material, producing non-uniformly oxidized surfaces that reduce deposition rates and impair device uniformity and run-to-run reproducibility.We have also determined that the graphite susceptors typically used with CSS deposition convert a portion of the oxygen ambient to CO and CO2 during deposition. The amount converted is highly dependent on the type and age of the graphite susceptor used. The COx byproducts are not efficiently incorporated in the CdTe film and do not influence the deposition as oxygen does. We describe the effect of the changing oxygen partial pressure during the course of deposition. Finally, we report high-efficiency solar cells (12.8% AM 1.5) made without oxygen.

Theoretical aspects and practical design criteria for high-efficiency PAs

2004 ◽  
Author(s):  
Paolo Colantonio ◽  
Franco Giannini ◽  
Ernesto Limiti
Keyword(s):  
High Efficiency ◽  
Design Criteria ◽  
Practical Design

scholarly journals A Market Research Effort Leading to the Development of a High Efficiency 10,000 shp Gas Turbine System

1981 ◽  
Author(s):  
K. Frankfort ◽  
J. Rich
Keyword(s):  
Gas Turbine ◽  
Centrifugal Compressor ◽  
Thermal Efficiency ◽  
Market Research ◽  
High Efficiency ◽  
Research Effort ◽  
Design Criteria ◽  
Performance Parameters ◽  
Product Specification ◽  
Regenerative Cycle

This paper describes the market research efforts which established the performance parameters, the design criteria and the product specification for a new 10,000 shp regenerative cycle gas turbine system which incorporates a two-stage intercooled centrifugal compressor and features a thermal efficiency which exceeds 43 percent.

scholarly journals Graded Carrier Concentration Absorber Profile for High Efficiency CIGS Solar Cells

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Antonino Parisi ◽  
Riccardo Pernice ◽  
Vincenzo Rocca ◽  
Luciano Curcio ◽  
Salvatore Stivala ◽  
...  
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Carrier Concentration ◽  
High Efficiency ◽  
Energy Gap ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Doping Density ◽  
Cigs Solar Cells

We demonstrate an innovative CIGS-based solar cells model with a graded doping concentration absorber profile, capable of achieving high efficiency values. In detail, we start with an in-depth discussion concerning the parametrical study of conventional CIGS solar cells structures. We have used the wxAMPS software in order to numerically simulate cell electrical behaviour. By means of simulations, we have studied the variation of relevant physical and chemical parameters—characteristic of such devices—with changing energy gap and doping density of the absorber layer. Our results show that, in uniform CIGS cell, the efficiency, the open circuit voltage, and short circuit current heavily depend on CIGS band gap. Our numerical analysis highlights that the band gap value of 1.40 eV is optimal, but both the presence of Molybdenum back contact and the high carrier recombination near the junction noticeably reduce the crucial electrical parameters. For the above-mentioned reasons, we have demonstrated that the efficiency obtained by conventional CIGS cells is lower if compared to the values reached by our proposed graded carrier concentration profile structures (up to 21%).

scholarly journals Optimization of p-GaN/InGaN/n-GaN Double Heterojunction p-i-n Solar Cell for High Efficiency: Simulation Approach

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Aniruddha Singh Kushwaha ◽  
Pramila Mahala ◽  
Chenna Dhanavantri
Keyword(s):  
Solar Cell ◽  
High Efficiency ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Grid Pattern ◽  
Individual Layer ◽  
Doping Density ◽  
Double Heterojunction

We have conducted numerical simulation of p-GaN/In0.12Ga0.88N/n-GaN, p-i-n double heterojunction solar cell. The doping density, individual layer thickness, and contact pattern of the device are investigated under solar irradiance of AM1.5 for optimized performance of solar cell. The optimized solar cell characteristic parameters for cell area of 1  × 1 mm2are open circuit voltage of 2.26 V, short circuit current density of 3.31 mA/cm2, fill factor of 84.6%, and efficiency of 6.43% with interdigitated grid pattern.

Criteria for the Design of High Efficiency Planocentric Transmissions

1992 ◽  
Author(s):  
Juan Carlos Jáuregui ◽  
Rodrigo López Sansalvador
Keyword(s):  
High Pressure ◽  
Detailed Analysis ◽  
Special Interest ◽  
High Efficiency ◽  
Single Stage ◽  
Geometric Constraints ◽  
Design Criteria ◽  
Gear Teeth ◽  
Space Solution ◽  
Pressure Angle

Abstract In this paper, the design criteria for high efficiency planocentric transmissions is presented. The space solution of a single stage planocentric transmission is limited by geometric constraints. These constraints are produced basically by the interference between pinion teeth and gear teeth. Special interest is focused on the interferences of internal gears and a detailed analysis of the influence of teeth parameters, such as addendum coefficient and pressure angle, is included. Conclusions are drawn from the analysis of the interferences and a design criteria is outlined. It was found that the space solution can be wider if pinion and gear are designed with stub teeth and high pressure angle.

Design Criteria for High-Efficiency SPM Synchronous Motors

2006 ◽  
Vol 21 (2) ◽  
pp. 396-404 ◽  
Author(s):  
N. Bianchi ◽  
S. Bolognani ◽  
P. Frare
Keyword(s):  
High Efficiency ◽  
Design Criteria ◽  
Synchronous Motors

Rational design of an anchoring peptide for high-efficiency and quantitative modification of peptides and DNA strands on gold nanoparticles

Nanoscale ◽  
2018 ◽  
Vol 10 (24) ◽  
pp. 11491-11497 ◽  
Author(s):  
Xin-Yi Li ◽  
Fu-Yan Feng ◽  
Xiao-Dong Zhou ◽  
Ji-Ming Hu
Keyword(s):  
Gold Nanoparticles ◽  
Rational Design ◽  
High Efficiency ◽  
Design Criteria ◽  
Dna Strands ◽  
Quantitative Modification

New design criteria for the anchor were established to provide a high-efficiency approach to modify peptides or DNAs on AuNPs.

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