Material Control for High-Efficiency Amorphous Silicon Solar Cells

1993 ◽  
Vol 297 ◽  
Author(s):  
Yoshihiro Hishikawa ◽  
Manabu Sasaki ◽  
Sadaji Tsuge ◽  
Shingo Okamoto ◽  
Shinya Tsuda
Keyword(s):  
Solar Cells ◽  
Deposition Rate ◽  
High Efficiency ◽  
Defect Density ◽  
Wide Bandgap ◽  
Film Deposition ◽  
Material Control ◽  
High Efficiency Solar Cells ◽  
Film Deposition Rate ◽  
Conventional Device

A total-area conversion efficiency of 12.0% (100cm2) has been achieved for a single-junction a-Si solar cell. The film deposition rate (Rd) plays an essential role in controlling the optical and electrical properties of "device-quality" a-Si:H for high-efficiency solar cells. The properties of conventional "device-quality" a-Si:H films deposited from 100% SiH4 are primarily determined by the balance between Ts and Rd. A lower or higher deposition rate results in a-Si:H with a narrower or wider bandgap, respectively. This enables the properties of a-Si:H to be controlled independent of Ts. The controllable range of a-Si:H properties can be widened by effectively utilizing factors such as ion bombardment. For example, a high dilution of SiH4 with H2 ( H2 SiH4 = 10 or more) or an H2 plasma treatment after deposition results in a-Si:H with a very wide bandgap and low defect density, which cannot be achieved by using 100% SiH4- Controlling the properties of a-Si:H by applying vibrational / rotational energy is also investigated.

Improvement in Wide-Gap A-SI:H For High-Efficiency Solar Cells

1992 ◽  
Vol 258 ◽  
Author(s):  
Sadaji Tsuge ◽  
Yoshihiro Hishikawa ◽  
Shingo Okamoto ◽  
Manabu Sasaki ◽  
Shinya Tsuda ◽  
...  
Keyword(s):  
Solar Cells ◽  
Plasma Treatment ◽  
High Efficiency ◽  
Defect Density ◽  
Hydrogen Plasma ◽  
Wide Band ◽  
Open Circuit ◽  
Wide Band Gap ◽  
High Efficiency Solar Cells ◽  
Wide Gap

ABSTRACTA hydrogen-plasma treatment has been used for the first time to fabricate wide-gap, high-quality a-Si:H films. The hydrogen content (CH) of a-Si:H films substantially increases by the hydrogen-plasma treatment after deposition, without deteriorating the opto-electric properties of the films. The photoconductivity (σph) of ≥ 10-5 ο-1 cm-1, photosensitivity ( σ ph/σ d) of > 106 and SiH2/SiH of <0.2 are achieved for a film with CH of ∼25 atomic >%. The optical gap of the film is > 1.70 eV by the (α h ν )1/3 plot, and is >2 eV by the Tauc's plot. The open circuit voltage of a-Si solar cells exceeds 1 V conserving the fill factor of > 0.7 when the wide-gap a∼Si:H films are used as the i-layer, which proves the wide band gap and low defect density.

The Study of Optical and Electrical Properties of a-SiC:H for Multi-junction Si Thin Film Solar Cell

2010 ◽  
Vol 1245 ◽  
Author(s):  
Jenny H. Shim ◽  
W.K. Yoon ◽  
S.T. Hwang ◽  
S.W. Ahn ◽  
H.M. Lee
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
High Efficiency ◽  
Open Circuit Voltage ◽  
Defect Density ◽  
Wide Bandgap ◽  
Open Circuit ◽  
Deposition Condition ◽  
Wide Bandgap Material ◽  
Pressure Regime

AbstractStudies have shown that wide bandgap material is required for high efficiency multi-junction solar cell applications. Here, we address proper deposition condition for high quality a-SiC:H films. In high power high pressure regime, we observed that the defect density get much lowered to the similar defect level of a-Si:H film with high H2 dilution. Single junction solar cells fabricated with the optimized condition show high open circuit voltage and low LID effect. The degradation after the LID test was only 13 % reduction of the efficiency indicating that a-SiC:H could be promising material for multi-junction solar cells.

Enhanced up-converted fluorescence in fluorozirconate based glass ceramics for high efficiency solar cells

2008 ◽  
Author(s):  
Bernd Ahrens ◽  
Bastian Henke ◽  
Paul T. Miclea ◽  
Jacqueline A. Johnson ◽  
Stefan Schweizer
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Glass Ceramics ◽  
High Efficiency Solar Cells

Incorporating photon recycling into the analytical drift-diffusion model of high efficiency solar cells

2014 ◽  
Vol 116 (19) ◽  
pp. 194504 ◽  
Author(s):  
Matthew P. Lumb ◽  
Myles A. Steiner ◽  
John F. Geisz ◽  
Robert J. Walters
Keyword(s):  
Solar Cells ◽  
Diffusion Model ◽  
High Efficiency ◽  
Drift Diffusion Model ◽  
Drift Diffusion ◽  
High Efficiency Solar Cells ◽  
Photon Recycling
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