NREL/industry interaction: Amorphous silicon alloy research team formation

1994 ◽  
Author(s):  
Werner Luft
Keyword(s):  
Amorphous Silicon ◽  
Research Team ◽  
Team Formation ◽  
Silicon Alloy

Material Issues in the Commercialization of Amorphous Silicon Alloy Thin-Film Photovoltaic Technology

1998 ◽  
Vol 507 ◽  
Author(s):  
S. Guha ◽  
J. Yang ◽  
A. Banerjee ◽  
S. Sugiyama
Keyword(s):  
Amorphous Silicon ◽  
Triple Junction ◽  
Alloy Thin Film ◽  
Critical Material ◽  
Silicon Alloy ◽  
Cell Efficiency ◽  
Spectral Splitting ◽  
Photovoltaic Technology ◽  
Annual Capacity ◽  
Junction Structure

ABSTRACTTwo significant developments took place in 1997 in the field of amorphous silicon alloy photovoltaic technology. First, a world record stable cell efficiency of 13% was demonstrated using a spectral-splitting, triple-junction structure. Second, a triple-junction photovoltaic manufacturing facility of an annual capacity of 5 MW was commissioned. In order to make the transition from R&D to production, critical material issues and deposition methods which ensure the lowest module cost per delivered watt needed to be evaluated. In this paper, we discuss some of these issues with special reference to the cell materials.

Effect of Excitation Frequency on the Performance of Amorphous Silicon Alloy Solar Cells

1998 ◽  
Vol 507 ◽  
Author(s):  
J. Yang ◽  
S. Sugiyama ◽  
S. Guha
Keyword(s):  
Solar Cells ◽  
Glow Discharge ◽  
Amorphous Silicon ◽  
Excitation Frequency ◽  
Deposition Rates ◽  
Solar Cell Performance ◽  
Single Junction ◽  
Silicon Alloy ◽  
Double Junction ◽  
Junction Structure

ABSTRACTWe have studied amorphous silicon alloy solar cells made by using a modified-very-highfrequency glow discharge at 75 MHz with a deposition rate of ∼6 Å/s. The solar cell performance is compared with those made from conventional glow discharge at 13.56 MHz with lower deposition rates. Cells made at ∼6 Å/s with 75 MHz showed comparable stabilized efficiency to those made at ∼3 Å/s with 13.56 MHz. The best performance, however, was obtained with ∼1 Å/s, including a stabilized 9.3% a-Si alloy single-junction cell employing conventional glow discharge technique. Using 75 MHz, we have achieved 11.1% and 10.0% initial active-area efficiencies for a-Si alloy and a-SiGe alloy n i p cells, respectively. An initial efficiency of 11.0% has also been obtained in a dual bandgap double-junction structure.

Improved Blue Response of Amorphous Silicon Alloy Solar Cells

1990 ◽  
Vol 192 ◽  
Author(s):  
A. Banerjee ◽  
S. Guha
Keyword(s):  
Solar Cell ◽  
Amorphous Silicon ◽  
Double Layer ◽  
Single Layer ◽  
Antireflection Coating ◽  
Silicon Alloy ◽  
Total Current Density ◽  
The Individual ◽  
Hydrogenated Amorphous ◽  
Ar Coating

ABSTRACTA two-layer MgF2/ITO antireflection (AR) coating has been used to reduce the reflection losses from the surface of a hydrogenated amorphous silicon alloy solar cell. This has resulted in a higher efficiency device primarily due to an improved blue response. The relative thicknesses of the MgF2 and ITO layers have been tailored to give the highest overall quantum efficiency (Q) values, which are higher than that obtained with a single-layer antireflection coating. Typically, the 0 value at 400 nm (Q400) has been increased from 0.58 to 0.68 for a single a:SiH cell. Incorporation of the double-layer AR coating in conjunction with μc-SiC p-layer has yielded Q400 value of 0.77. The total current density obtained by adding the individual contribution of the component cells of a dual bandgap triple amorphous silicon alloy solar cell has been increased from 21.90 to 23.27 mA/cm2 using the double-layer AR coating.

A novel design for amorphous silicon alloy solar cells

1988 ◽  
Author(s):  
S. Guha ◽  
J. Yang ◽  
A. Pawlikiewicz ◽  
T. Glatfelter ◽  
R. Ross ◽  
...  
Keyword(s):  
Solar Cells ◽  
Amorphous Silicon ◽  
Silicon Alloy ◽  
Novel Design

Band‐gap profiling for improving the efficiency of amorphous silicon alloy solar cells

1989 ◽  
Vol 54 (23) ◽  
pp. 2330-2332 ◽  
Author(s):  
S. Guha ◽  
J. Yang ◽  
A. Pawlikiewicz ◽  
T. Glatfelter ◽  
R. Ross ◽  
...  
Keyword(s):  
Solar Cells ◽  
Amorphous Silicon ◽  
Band Gap ◽  
Silicon Alloy
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