Linkage of Efficiency and Stability of a-Si Solar cells

1989 ◽  
Vol 149 ◽  
Author(s):  
David Redfield ◽  
Richard H. Bube
Keyword(s):  
Solar Cells ◽  
Steady State ◽  
Separate Species ◽  
Defect Centers ◽  
Si Solar Cells ◽  
The Stability ◽  
Kinetics Of

ABSTRACTBy combining the steady-state and transient behaviors of a recently generalized analysis of the kinetics of metastable defects in good amorphous Si:H, it is shown that no treatment can remove all metastable defects. There is always a significant remnant that is proposed to be the observed built-in defects, which are then not a separate species, distinct from the metastable defects. This remnant is due to vibrational breaking of weak bonds in latent defect centers, and cannot be due to recombination of thermally excited carriers. If the stability can be improved by reducing the number of these latent defect centers, this will also reduce the density of built-in defects that control the initial efficiency. Furthermore, there are good reasons to believe that the source of these defects is extrinsic to a-Si:H, so that improvement in both properties may be achievable.

scholarly journals The Stability and Steady-State Kinetics of Vanadium Chloroperoxidase from the Fungus Curvularia Inaequalis

1994 ◽  
Vol 225 (1) ◽  
pp. 151-157 ◽  
Author(s):  
Johannes W. P. M. Schijndel ◽  
Philip Barnett ◽  
Jeanet Roelse ◽  
Esther G. M. Vollenbroek ◽  
Ronald Wever
Keyword(s):  
Steady State ◽  
Steady State Kinetics ◽  
The Stability ◽  
Kinetics Of

Comprehensive Kinetic of Defects in a-SI:H

1991 ◽  
Vol 219 ◽  
Author(s):  
David Redfield ◽  
Richard H. Bube
Keyword(s):  
Solar Cells ◽  
Steady State ◽  
Light Intensity ◽  
Rate Equation ◽  
Defect Density ◽  
Microscopic Models ◽  
Dx Center ◽  
Stretched Exponentials ◽  
Kinetics Of ◽  
Insight Into

ABSTRACTLThe introduction of several new principles into the analysis of transition kinetics of metastable defects in a-Si:H has produced substantially improved rate equation for the density of defects as functions of time, light intensity, and temperature. The solution of this equation is stretched exponential (SE) having properties that explain in unifying way many observations of defect properties, including generation and anneal of the defect density in homogeneous films and degradation and anneal of solar cells. Major consequences are found for both the steady-state and transient properties of the defect density and for interpretations of microscopic models of the defects. These properties are also shown to be analogous to those of metastable centers in other materials, particularly the metastable DX center in AlGaAs which offers rare insight into the microscopic origins of stretched exponentials that can be applied to a-Si:H in ways that provide new perspectives on effects of alloying and hydrogen on stability.

The effect of dopants on the stability of a-Si solar cells

1984 ◽  
Author(s):  
H. Sakai ◽  
A. Asano ◽  
M. Nishiura ◽  
M. Kamiyama ◽  
Y. Uchida ◽  
...  
Keyword(s):  
Solar Cells ◽  
Si Solar Cells ◽  
The Stability

Improved evaluation of saturation currents and bulk lifetime in industrial Si solar cells by the quasi steady state photoconductance decay method

2016 ◽  
Vol 149 ◽  
pp. 258-265 ◽  
Author(s):  
Binhui Liu ◽  
Yifeng Chen ◽  
Yang Yang ◽  
Daming Chen ◽  
Zhiqiang Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Steady State ◽  
Quasi Steady State ◽  
Si Solar Cells

Impact of Hydrogen Dilution on the Properties and Light Induced Changes of A-SI:H Based Materials and Solar Cells

1997 ◽  
Vol 467 ◽  
Author(s):  
Yeeheng Lee ◽  
Lihong Jiao ◽  
Joohyun Koh ◽  
Hiroyuki Fujiwara ◽  
Zhou Lu ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Substrate Temperature ◽  
Growth Kinetics ◽  
Degradation Kinetics ◽  
Hydrogen Dilution ◽  
Si Solar Cells ◽  
Wide Range ◽  
Induced Changes ◽  
Kinetics Of

ABSTRACTStudies have been carried out on a-Si:H materials and corresponding solar cells fabricated with and without hydrogen dilution of silane by rf PECVD. The effect of hydrogen dilution on the growth kinetics and microstructures and their dependence on the substrate temperature have been studied. Hydrogen diluted a-Si:H materials and solar cells exhibit improved properties and higher stability to light induced changes. Distinct differences are found in the electron mobility lifetime (μτ) products and subgap absorption over a wide range of generation rates. Striking differences are also found in the kinetics of light induced degradation in both the materials and their corresponding solar cells. Direct correlations are presented between the degradation kinetics of p(a-SiC:H)/i(a-Si:H)/n(μc-Si) solar cells and those of thin film materials constituting the i-layers.

The Effect of H2 Dilution on the Stability of a-Si:H based Solar Cells

1994 ◽  
Vol 336 ◽  
Author(s):  
Liyou Yang ◽  
Liang-Fan Chen
Keyword(s):  
Solar Cells ◽  
Substrate Temperature ◽  
Structural Properties ◽  
Recovery Process ◽  
The Other ◽  
Component Model ◽  
Device Stability ◽  
Two Component ◽  
The Stability ◽  
Kinetics Of

ABSTRACTWe have systematically investigated the effect of H2 dilution on the stability of a-Si:H based solar cells. The results clearly show that the device stability against light soaking improves substantially with increasing H2 dilution until a threshold is reached. Beyond this threshold which depends on the substrate temperature, the stability no longer changes with further increase in H2 dilution. On the other hand, at a given ratio of H2 to the reactant gases, the device stability generally improves with increasing substrate temperature. Multi-step light soaking experiments have shown that devices made with H2 dilution saturate much faster (∼100 hours) under one-sun illumination and exhibit little overshoot effect in the recovery process, in sharp contrast to devices made without H2 dilution. Based on the simple two-component model for defect kinetics, these observations and the fact that the apparent saturation time coincides with the time constant of the “fast” defects strongly suggest that negligible amount of “slow” defects exist in materials made with H2 dilution. While H2 dilution generally suppresses the formation of microstructure giving rise to dihydride bonding and microvoids, the differences in the kinetics of light induced degradation cannot always be traced to obvious differences in these structural properties.

INDUSTRIALIZATION OF a-Si SOLAR CELLS

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-1155-C4-1164 ◽  
Author(s):  
Y. Kuwano ◽  
M. Ohnishi
Keyword(s):  
Solar Cells ◽  
Si Solar Cells

Kinetics of Various 99mTc-Sn-Pyrophosphate Compounds in the Rat

1977 ◽  
Vol 16 (04) ◽  
pp. 157-162 ◽  
Author(s):  
C. Schümichen ◽  
B. Mackenbrock ◽  
G. Hoffmann
Keyword(s):  
Normal Saline ◽  
Half Life ◽  
Compound A ◽  
Short Half Life ◽  
Low Concentrations ◽  
The Stability ◽  
Kinetics Of ◽  
In Vitro Stability

SummaryThe bone-seeking 99mTc-Sn-pyrophosphate compound (compound A) was diluted both in vitro and in vivo and proved to be unstable both in vitro and in vivo. However, stability was much better in vivo than in vitro and thus the in vitro stability of compound A after dilution in various mediums could be followed up by a consecutive evaluation of the in vivo distribution in the rat. After dilution in neutral normal saline compound A is metastable and after a short half-life it is transformed into the other 99mTc-Sn-pyrophosphate compound A is metastable and after a short half-life in bone but in the kidneys. After dilution in normal saline of low pH and in buffering solutions the stability of compound A is increased. In human plasma compound A is relatively stable but not in plasma water. When compound B is formed in a buffering solution, uptake in the kidneys and excretion in urine is lowered and blood concentration increased.It is assumed that the association of protons to compound A will increase its stability at low concentrations while that to compound B will lead to a strong protein bond in plasma. It is concluded that compound A will not be stable in vivo because of a lack of stability in the extravascular space, and that the protein bond in plasma will be a measure of its in vivo stability.

Studies on Backside Al-Contact Formation in Si Solar Cells: Fundamental Mechanisms

2008 ◽  
Author(s):  
Vishal Mehta ◽  
Bhushan Sopori ◽  
Przemyslaw Rupnowski ◽  
Helio Moutinho ◽  
Aziz Shaikh ◽  
...  
Keyword(s):  
Solar Cells ◽  
Contact Formation ◽  
Si Solar Cells
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