Effects of Ga Compositional Grading on CIGS Electronic Properties Relevant to Solar Cell Performance

2009 ◽  
Vol 1165 ◽  
Author(s):  
JinWoo Lee ◽  
Jeroen K.J. van Duren ◽  
Alex Pudov ◽  
Miguel Contreras ◽  
David J. Cohen
Keyword(s):  
Solar Cell ◽  
Minority Carrier ◽  
Defect Density ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Free Hole ◽  
Deep Acceptor ◽  
Free Carrier Density ◽  
Carrier Collection ◽  
Compositional Grading

AbstractTransient photocurrent (TPI) and photocapacitance (TPC) spectroscopy have been applied to a set of compositional graded CuIn1-xGaxSe2 (CIGS) solar cell devices deposited by the vacuum co-evaporation method at the National Renewable Energy Laboratory. These measurements provide a spectral map of the optically induced release of carriers for photon energies from below 1 eV to 2 eV. By comparing the two types of spectra one can distinguish majority from minority carrier processes and they clearly reveal a higher degree of minority carrier collection for devices in which the Ga fraction increased monotonically with distance from the junction. This agrees with notions of how compositional grading improves overall cell performance. Minority carrier collection was even more strongly enhanced in sample devices incorporating v-shaped Ga-grading. Spatial profiles of the free hole carrier densities and deep acceptor concentrations were examined using drive-level capacitance profiling (DLCP). In the compositionally graded sample devices we found that the free carrier density decreased and that defect density increased with increasing Ga fraction toward back contact.

Critical Assessment of Sub-Bandgap Primary Photocurrent in a-Si:H Based Solar Cells.

1991 ◽  
Vol 219 ◽  
Author(s):  
T. X. Zhou ◽  
S. S. Hegedus ◽  
C. M. Fortmann
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Defect Density ◽  
Critical Assessment ◽  
Cell Performance ◽  
Significant Discrepancy ◽  
Solar Cell Performance ◽  
Before And After ◽  
Degree Of Degradation

ABSTRACTThe sub-bandgap primary photocurrent and the solar cell performance of a-Si:H p-i-n devices have been studied before and after light induced degradation. The results indicate significant discrepancy between the two methods when used to estimate the degree of degradation and the defect density in the i-layers. A preliminary explanation is proposed.

Importance of Defect Density near the p-i Interface for a-Si:H Solar Cell Performance

2001 ◽  
Vol 664 ◽  
Author(s):  
B.A. Korevaar ◽  
C. Smit ◽  
R.A.C.M.M. van Swaaij ◽  
D.C. Schram ◽  
M.C.M. van de Sanden
Keyword(s):  
Solar Cell ◽  
Fill Factor ◽  
Defect Density ◽  
Spectral Response ◽  
Cell Performance ◽  
Local Defect ◽  
Initial Growth ◽  
Lower Efficiency ◽  
Solar Cell Performance ◽  
The Individual

ABSTRACTA cascaded arc expanding thermal plasma is used to deposit intrinsic hydrogenated amorphous silicon at growth rates larger than 2 Å/s. Implementation into a single junction p-i-n solar cell resulted in initial efficiencies of ∼7%, although all the optical and initial electrical properties of the individual layers are comparable with RF-PECVD deposited films. The somewhat lower efficiency is due to a smaller fill factor. Spectral response measurements, illuminated J,V- measurements, and simulations indicate that a higher local defect density in the region near the p-i interface might be responsible for the smaller fill factor in comparison with conventional low- rate RF-PECVD. The higher defect density is most likely caused by the initial growth in the first 10 to 50 nm. Therefore, controlled initial growth of the intrinsic layer is suggested for good solar cell performance.

scholarly journals Effect of Different Minority Carrier Lifetime of Multicrystalline Wafer on Solar Cell Performance

2021 ◽  
Vol 7 (4) ◽  
pp. 100
Author(s):  
Xiaolan Yi
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Industrial Production ◽  
Carrier Lifetime ◽  
Minority Carrier ◽  
Minority Carrier Lifetime ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Significant Difference ◽  
Ultimate Efficiency

<p>In thisarticle, a study of the effect of different minority carrier lifetime (τ) of wafers on solar cell performance in a conventional industrial production line has been carried out. The results clearly showed that the ultimate efficiency of the solar cells made by wafers of 1μs &lt;τ&lt;1.2μs and 1.2μs &lt;τ&lt;1.5μs is much higher than that of solar cells made by wafers of τ&lt;1μs. The gap of both is about 0.38%–0.53%. Differently, there is no significant difference between wafers of 1μs&lt;τ&lt;1.2μs and 1.2μs &lt;τ&lt;1.5μs. The results obtained are useful when the solar cell companies establish original wafers test standard in industry.</p>

Experimental and Theoretical Comparable Study of Pure and Zinc Porphyrin Surface Modified ZnO Nanorod Arrays for Hybrid Solar Cell Applications

2020 ◽  
pp. 114-119
Keyword(s):  
Solar Cell ◽  
Electrochemical Impedance ◽  
Hybrid Solar Cell ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Annealing Effects ◽  
Vertically Aligned ◽  
Surface Modified

Experimental and theoretical study Porphyrin-grafted ZnO nanowire arrays were investigated for organic/inorganic hybrid solar cell applications. Two types of porphyrin – Tetra (4-carboxyphenyle) TCPP and meso-Tetraphenylporphine (Zinc-TPP)were used to modify the nanowire surfaces. The vertically aligned nanowires with porphyrin modifications were embedded in graphene-enriched poly (3-hexylthiophene) [G-P3HT] for p-n junction nanowire solar cells. Surface grafting of ZnO nanowires was found to improve the solar cell efficiency. There are different effect for the two types of porphyrin as results of Zn existing. Annealing effects on the solar cell performance were investigated by heating the devices up to 225 °C in air. It was found that the cell performance was significantly degraded after annealing. The degradation was attributed to the polymer structural change at high temperature as evidenced by electrochemical impedance spectroscopy measurements.

scholarly journals Improvement of organic solar cell performance by multiple plasmonic excitations using mixed-silver nanoprisms

2021 ◽  
Author(s):  
Apichat Phengdaam ◽  
Supeera Nootchanat ◽  
Ryousuke Ishikawa ◽  
Chutiparn Lertvachirapaiboon ◽  
Kazunari Shinbo ◽  
...  
Keyword(s):  
Solar Cell ◽  
Organic Solar Cell ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Silver Nanoprisms
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