Light-induced changes in hydrogen-diluted a-Si : H materials and solar cells: A new perspective on self-consistent analysis

1997 ◽  
Vol 49 (1-4) ◽  
pp. 149-156 ◽  
Author(s):  
Y. Lee ◽  
L. Jiao ◽  
H. Liu ◽  
Z. Lu ◽  
R.W. Collins ◽  
...  
Keyword(s):  
Solar Cells ◽  
Self Consistent ◽  
New Perspective ◽  
Induced Changes

scholarly journals Active, Reactive, and Apparent Power in Dielectrophoresis: Force Corrections from the Capacitive Charging Work on Suspensions Described by Maxwell-Wagner’s Mixing Equation

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 738
Author(s):  
Jan Gimsa
Keyword(s):  
Volume Fraction ◽  
Inhomogeneous Field ◽  
Effective Polarizability ◽  
Polarization Mechanism ◽  
Free Transition ◽  
Lossy Media ◽  
New Perspective ◽  
A Chain ◽  
A Charge ◽  
Induced Changes

A new expression for the dielectrophoresis (DEP) force is derived from the electrical work in a charge-cycle model that allows the field-free transition of a single object between the centers of two adjacent cubic volumes in an inhomogeneous field. The charging work for the capacities of the volumes is calculated in the absence and in the presence of the object using the external permittivity and Maxwell-Wagner’s mixing equation, respectively. The model provides additional terms for the Clausius-Mossotti factor, which vanish for the mathematical boundary transition toward zero volume fraction, but which can be interesting for narrow microfluidic systems. The comparison with the classical solution provides a new perspective on the notorious problem of electrostatic modeling of AC electrokinetic effects in lossy media and gives insight into the relationships between active, reactive, and apparent power in DEP force generation. DEP moves more highly polarizable media to locations with a higher field, making a DEP-related increase in the overall polarizability of suspensions intuitive. Calculations of the passage of single objects through a chain of cubic volumes show increased overall effective polarizability in the system for both positive and negative DEP. Therefore, it is proposed that DEP be considered a conditioned polarization mechanism, even if it is slow with respect to the field oscillation. The DEP-induced changes in permittivity and conductivity describe the increase in the overall energy dissipation in the DEP systems consistent with the law of maximum entropy production. Thermodynamics can help explain DEP accumulation of small objects below the limits of Brownian motion.

scholarly journals Perovskite Solar Cells: A New Perspective on the Role of A-Site Cations in Perovskite Solar Cells (Adv. Energy Mater. 14/2018)

2018 ◽  
Vol 8 (14) ◽  
pp. 1870062
Author(s):  
Chang Woo Myung ◽  
Jeonghun Yun ◽  
Geunsik Lee ◽  
Kwang S. Kim
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
New Perspective ◽  
A Site ◽  
Energy Mater

The Light Induced Changes in A-Si: H Materials and Solar Cells—Where We are Now

1997 ◽  
Vol 467 ◽  
Author(s):  
C. R. Wronski
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Paper Briefly ◽  
Cell Structures ◽  
Large Effort ◽  
Induced Changes ◽  
The Impact ◽  
Made In

ABSTRACTThe quest for understanding and especially controlling the reversible light induced changes in a-Si:H based materials has been ongoing for the last twenty years. This has been accompanied by a corresponding large effort in minimizing their effects on more efficient a-Si:H based solar cells. Despite the complexities in both the phenomena as well as the solar cells, progress has been made in both the scientific and technological arenas. This paper briefly reviews primarily studies on the characterization and reduction of the metastable changes in materials and the correlation of these changes with those in efficient solar cells. It will discuss the impact of studies on materials as well as the continuous advances made with “engineering” of solar cell structures on their improved stabilized performance.

Understanding Metastable Defect Creation in CIGS by Detailed Device Modeling and Measurements on Bifacial Solar Cells

2007 ◽  
Vol 1012 ◽  
Author(s):  
Jin Woo Lee ◽  
David Berney Needleman ◽  
William N. Shafarman ◽  
J. David Cohen
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Channel Modeling ◽  
Open Circuit ◽  
Conversion Model ◽  
Donor Acceptor ◽  
Recombination Channel ◽  
Cigs Solar Cells ◽  
Induced Changes

AbstractWe present a compensated donor-acceptor conversion model to explain the metastable light-induced changes in the performance of CIGS solar cells. In this model, compensating donors plays the role of recombination channel. Modeling using SCAPS-1D yielded reasonable fits to the I-V curves in different metastable states, matching the experimentally observed decreases in short circuit current and fill factor as well as the lack of change in open circuit voltage. Comparison of the experimental results from bifacial solar cells and SCAPS simulations strongly supports the compensated donor-acceptor conversion model both qualitatively and quantitatively.

A new perspective on the characterization of materials for a-Si:H solar cells

2001 ◽  
Vol 66 (1-4) ◽  
pp. 231-237 ◽  
Author(s):  
L. Jiao ◽  
X. Niu ◽  
Z. Lu ◽  
C.R. Wronski ◽  
A. Matsuda ◽  
...  
Keyword(s):  
Solar Cells ◽  
New Perspective ◽  
Characterization Of Materials

Experimental characterization and self-consistent modeling of luminescence coupling effect in III-V multijunction solar cells

2013 ◽  
Vol 103 (26) ◽  
pp. 263907 ◽  
Author(s):  
Tomah Sogabe ◽  
Akio Ogura ◽  
Chao-Yu Hung ◽  
Valery Evstropov ◽  
Mikhail Mintairov ◽  
...  
Keyword(s):  
Solar Cells ◽  
Coupling Effect ◽  
Experimental Characterization ◽  
Multijunction Solar Cells ◽  
Self Consistent

scholarly journals Stable dinitrile end-capped closed-shell non-quinodimethane as donor, acceptor and additive of organic solar cells

2021 ◽  
Author(s):  
Liang weixuan ◽  
Liu Peng ◽  
Zhang Yiheng ◽  
Zhu weiya ◽  
Tao Xinyang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Closed Shell ◽  
Open Shell ◽  
Donor Acceptor ◽  
Moderate Energy ◽  
Shell Chemical ◽  
New Perspective ◽  
Enhanced Photostability ◽  
Photovoltaic Material

Non-fullerene acceptors exhibit great potential to improve photovoltaic performances of organic solar cells. However, it is important to further enhance chemical stability and device durability for future commercialization, especially for Y6-series small molecule acceptors with 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) type as ending group. In this work, an IC-free photovoltaic material YF-CN consisting of 2-fluoren-9-ylidenepropanedinitrile terminal was designed and synthesized by stille coupling. YF-CN exhibited closed-shell chemical structure with enhanced photostability and improved morphological compatibility with the binary PCE10:Y6 blend. The moderate energy level makes YF-CN could serve as a multifunctional material, such as donor, acceptor and the third component. When adding YF-CN as second donor into PCE10:Y6 system, an improved power conversion efficiency of 12.03% was achieved for as-cast device. Importantly, the ternary PCE10:YF-CN:Y6-devices showed enhanced storage durability maintaining 91% of initial PCE after the 360 hours. This work provides new perspective to understand the open-shell character of donor and closed-shell structure of acceptors, respectively, as well as promising design concept of stable IC-free acceptors for organic solar cells.

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