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# IEEE Journal of Photovoltaics

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Displaying Results 1 - 25 of 31

Publication Year: 2012, Page(s):C1 - C4
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• ### IEEE Journal of Photovoltaics publication information

Publication Year: 2012, Page(s): C2
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• ### Influence of a-Si:H Deposition Temperature on Surface Passivation Property and Thermal Stability of a-Si:H/SiN$_{x}$:H Stack

Publication Year: 2012, Page(s):405 - 410
Cited by:  Papers (2)
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The inability to withstand temperatures much above the deposition temperature without significant degradation has limited the application of hydrogenated amorphous silicon (a-Si:H) for surface passivation. To address this limitation, in this paper, the surface passivation quality and thermal stability of a stack-passivating system, combining a layer of intrinsic amorphous silicon and a capping lay... View full abstract»

• ### An Infant Mortality Study of III–V Multijunction Concentrator Cells

Publication Year: 2012, Page(s):411 - 416
Cited by:  Papers (5)
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Six hundred and forty III-V triple-junction solar cells were evaluated in this study. The cells were initially electrically and optically characterized prior to being packaged and placed on-sun for a short exposure. Following exposure, the cells were partitioned according to their performance change. An infant mortality rate of 0.5% was observed and attributed to preexisting voids in the die attac... View full abstract»

• ### The Effect of Spectrum Variation on the Energy Production of Triple-Junction Solar Cells

Publication Year: 2012, Page(s):417 - 423
Cited by:  Papers (8)
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We analyze the energy production of a current-matched, two-terminal triple-junction solar cell under different spectrum conditions. We compare this energy production with that of a separate-terminal three subcell system. Under real-spectrum conditions, the energy loss of the two-terminal system can be greater than 9% because of the current mismatch that frequently occurs in real meteorological con... View full abstract»

• ### Using Phase Effects to Understand Measurements of the Quantum Efficiency and Related Luminescent Coupling in a Multijunction Solar Cell

Publication Year: 2012, Page(s):424 - 433
Cited by:  Papers (14)
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We analyze the quantum efficiency measurement of a series-connected multijunction solar cell by modeling the cell as an ac resistive-capacitive circuit and studying the complex current as a function of the light biasing. The photocurrent induced by directly absorbed photons is modeled as an independent current source, whereas the luminescent coupling current from higher bandgap to lower bandgap su... View full abstract»

• ### GeSiSn Photodiodes With 1 eV Optical Gaps Grown on Si(100) and Ge(100) Platforms

Publication Year: 2012, Page(s):434 - 440
Cited by:  Papers (19)
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Ge1-x-ySixSny alloys have reached a level of maturity that permits the creation of prototype devices on group-IV platforms. Here, we compare the optical and electrical properties of GeSiSn diodes with similar target compositions (Si; 10-11%, Sn; 1.7-2.3%) grown directly on Si(100) and Ge(100) using low-temperature ultrahigh vacuum chemical vapor deposition reaction... View full abstract»

• ### A Review and Comparison of One- and Two-Dimensional Simulations of Solar Cells Featuring Selective Emitters

Publication Year: 2012, Page(s):441 - 449
Cited by:  Papers (7)
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The optimization of the metallization pattern and the emitter doping profiles and geometry for selective emitter solar cells require reliable and fast simulation models. The computational effort of one-dimensional models is usually much lower than that of two-dimensional models, which in turn allow for more realistic calculations. We review the literature on one-dimensional and two-dimensional mod... View full abstract»

• ### Analysis of Phosphorus-Doped Silicon Oxide Layers Deposited by Means of PECVD as a Dopant Source in Diffusion Processes

Publication Year: 2012, Page(s):450 - 456
Cited by:  Papers (6)
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In order to increase the conversion efficiencies of silicon solar cells, advanced cell structures with selectively doped areas have received increasing interest. There is a strong need to separate the contacted diffusion profiles from the noncontacted. On the one hand, a high dopant concentration in the contact regime reduces the series resistance losses mainly due to lowered contact resistance. A... View full abstract»

• ### Isotextured Silicon Solar Cell Analysis and Modeling 1: Optics

Publication Year: 2012, Page(s):457 - 464
Cited by:  Papers (34)
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A comprehensive investigation reveals three useful approximations to the optical behavior of isotextured silicon solar cells. First, we confirm experimentally that front-surface reflectance is accurately modeled with “spherical cap” geometry. Second, we find that light reflected from the surface has a Lambertian distribution. Random upright pyramid texturing results in a less favorab... View full abstract»

• ### Isotextured Silicon Solar Cell Analysis and Modeling 2: Recombination and Device Modeling

Publication Year: 2012, Page(s):465 - 472
Cited by:  Papers (7)
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We extend our analysis of isotextured silicon solar cells by 1) examining experimentally the role played by isotexture in determining the surface recombination velocity at silicon surfaces and 2) combining these experimental results with our model for photogeneration in order to simulate in one dimension typical solar cell devices with isotextured surfaces. We examine both undiffused and diffused ... View full abstract»

• ### Reverse Saturation Current Density Imaging of Highly Doped Regions in Silicon Employing Photoluminescence Measurements

Publication Year: 2012, Page(s):473 - 478
Cited by:  Papers (4)
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We present a camera-based technique for the local determination of reverse saturation current densities J0 of highly doped regions in silicon wafers utilizing photoconductance-calibrated photoluminescence (PL) imaging at different illumination intensities. We apply this approach to 12.5 × 12.5 cm2 float zone silicon (Si) samples with textured surfaces and a homogeneous... View full abstract»

• ### Investigating Internal Gettering of Iron at Grain Boundaries in Multicrystalline Silicon via Photoluminescence Imaging

Publication Year: 2012, Page(s):479 - 484
Cited by:  Papers (14)
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In this paper, we present measurements and modeling of the reduction in dissolved iron Fe; concentrations near grain boundaries in multicrystalline silicon (mc-Si) wafers. The measurements of the interstitial Fe concentrations are obtained via photoluminescence images taken before and after iron-boron pair dissociation. A simple diffusion-capture model was developed to characterize the removal of ... View full abstract»

• ### Geometrical Analysis of Solar Cells With Partial Rear Contacts

Publication Year: 2012, Page(s):485 - 493
Cited by:  Papers (11)
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The analysis of solar cells where the posterior metal contact is formed only on part of the rear surface, which is mostly covered by a nonconductive, passivating layer, is both important and complex. A possible approach, based on a geometrical representation of the device structure, is examined here. As minority carriers flow toward the localized rear contact, they crowd inside a diminishing cross... View full abstract»

• ### Colored Ribbons Achieve +0.28%$_{bf abs.}$ Efficiency Gain

Publication Year: 2012, Page(s):494 - 498
Cited by:  Papers (3)
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Flat metallic ribbons connect the solar cells in conventional crystalline silicon modules. Acting like a mirror, they reflect incoming radiation out of the module. The area covered by the ribbons (around 3.5%) is mainly lost for photovoltaic conversion. We present colored cell connectors which scatter incident irradiation. Due to subsequent total internal reflection at the glass/air interface, the... View full abstract»

• ### A Crystalline Metallic Copper Network Application Film Produced by High-Temperature Atmospheric Sintering

Publication Year: 2012, Page(s):499 - 505
Cited by:  Papers (5)
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We show the first production of a copper (Cu) application film (AF) consisting of a novel network of crystalline metallic Cu embedded with copper-phosphorus-oxygen glasses (Cu 2(PO4) and Cu 2P2O 7) to provide new feedstock materials for crystalline silicon (Si) photovoltaics (PVs). The Cu crystal network was preferentially grown in AF, and thu... View full abstract»

• ### Hot Carrier Solar Cells: Controlling Thermalization in Ultrathin Devices

Publication Year: 2012, Page(s):506 - 511
Cited by:  Papers (4)
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In operating hot carrier solar cells, a steady-state hot carrier distribution is established in the absorber in such a way that the excess kinetic energy of carriers can be collected. A high-carrier concentration is normally favorable to the formation of a nonequilibrium hot-carrier population. A small absorber thickness is thus expected to improve the efficiency of hot carrier solar cells, but no... View full abstract»

• ### Temperature Dependence of Open-Circuit Voltage and UPS Study for P3HT:PCBM Organic Solar Cells

Publication Year: 2012, Page(s):512 - 518
Cited by:  Papers (3)
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In this paper, the open-circuit voltage Voc of a poly(3-hexylthiophene-2,5-diyl) (P3HT) and a [6,6]-phenyl C61 -butyric acid methyl ester (PCBM) bulk heterojunction organic solar cell device was measured at temperatures ranging from 15°C to 145°C. The temperature dependence of the vacuum shift and of the highest occupied molecular or... View full abstract»

• ### An Investigation of the Surface Properties of (Ag,Cu)(In,Ga)Se $_{bf 2}$ Thin Films

Publication Year: 2012, Page(s):519 - 523
Cited by:  Papers (8)
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(Ag,Cu)(In,Ga)Se2 alloy absorber layers with various Ga/(Ga+In) and Ag/(Ag+Cu) ratios were deposited using multisource elemental evaporation and analyzed by glancing incidence X-ray diffraction and energy dispersive X-ray spectroscopy. All films exhibit chalcopyrite reflections in the X-ray diffraction pattern and films with 0.5 ≤ Ga/(Ga+In) <; 1 and Ag/(Ag+Cu) >; 0.5 have ... View full abstract»

• ### Performance Analysis of a Single-Axis Tracking PV System

Publication Year: 2012, Page(s):524 - 531
Cited by:  Papers (27)
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In this paper a performance analysis of a photovoltaic (PV) tracking system is conducted, to study its efficiency based on experimental results of a specific power plant. A single-axis system is analyzed, taking into account different indexes to better characterize the overall system performance. Experimental data have been collected by an on-site monitoring system over a period of one year, bring... View full abstract»

• ### Control and Circuit Techniques to Mitigate Partial Shading Effects in Photovoltaic Arrays

Publication Year: 2012, Page(s):532 - 546
Cited by:  Papers (148)  |  Patents (1)
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Partial shading in photovoltaic (PV) arrays renders conventional maximum power point tracking (MPPT) techniques ineffective. The reduced efficiency of shaded PV arrays is a significant obstacle in the rapid growth of the solar power systems. Thus, addressing the output power mismatch and partial shading effects is of paramount value. Extracting the maximum power of partially shaded PV arrays has b... View full abstract»

• ### Limits of Advisability for Master–Slave Configuration of DC–AC Converters in Photovoltaic Systems

Publication Year: 2012, Page(s):547 - 554
Cited by:  Papers (13)
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Several feed-in tariffs are now available for photovoltaic (PV) systems, and thus, the maximization of the productivity is very important; this goal can be achieved by solar cell technologies with high efficiency and low temperature losses, one axis or dual axis sun-tracking systems, proper cooling techniques for PV modules in building integrated applications, master-slave (M-S) control for the in... View full abstract»

• ### Maximum-Power-Based PV Performance Validation Method: Application to Single-Axis Tracking and Fixed-Tilt c-Si Systems in the Italian Alpine Region

Publication Year: 2012, Page(s):555 - 563
Cited by:  Papers (5)
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This paper presents springtime monitoring results for different crystalline-silicon (c-Si) photovoltaic (PV) systems installed at the multitechnology ground-mounted PV test field at the Airport Bolzano Dolomiti (ABD) located in the Italian Alps. The system data are analyzed and discussed.The main purpose of this paper is to validate the performance evaluation through a methodology based on the eff... View full abstract»

• ### Dynamic Stability of Three-Phase Grid-Connected Photovoltaic System Using Zero Dynamic Design Approach

Publication Year: 2012, Page(s):564 - 571
Cited by:  Papers (34)
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This paper presents a new approach to control the grid current and dc-link voltage for maximum power point tracking and improvement of the dynamic response of a three-phase grid-connected photovoltaic (PV) system. To control the grid current and dc-link voltage, the zero dynamic design approach of feedback linearization is used, which linearizes the system partially and enables controller design f... View full abstract»

• ### Simulation Tool for Equivalent Circuit Modeling of Photovoltaic Devices

Publication Year: 2012, Page(s):572 - 579
Cited by:  Papers (18)
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We describe an open-source simulation tool for the modeling of photovoltaic devices with equivalent circuit networks. Our SpiceGUI interconnects devices with known current voltage characteristics and calculates the current density-voltage curve of the combined device. The SpiceGUI is written as hybrid Octave/MATLAB code and has a flexible graphical user interface. It supports batch simulations wit... View full abstract»