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Title: Metal nano-grids for transparent conduction in solar cells

Journal Article · · Solar Energy Materials and Solar Cells
 [1]
  1. Univ. of Florida, Gainesville, FL (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)

A general procedure for predicting metal grid performance in solar cells was developed. Unlike transparent conducting oxides (TCOs) or other homogeneous films, metal grids induce more resistance in the neighbor layer. The resulting balance of transmittance, neighbor and grid resistance was explored in light of cheap lithography advances that have enabled metal nano-grid (MNG) fabrication. The patterned MNGs have junction resistances and degradation rates that are more favorable than solution-synthesized metal nanowires. Neighbor series resistance was simulated by the finite element method, although a simpler analytical model was sufficient in most cases. Finite-difference frequency-domain transmittance simulations were performed for MNGs with minimum wire width (w) of 50 nm, but deviations from aperture transmittance were small in magnitude. Depending on the process, MNGs can exhibit increased series resistance as w is decreased. However, numerous experimental reports have already achieved transmittance-MNG sheet resistance trade-offs comparable to TCOs. The transmittance, neighbor and MNG series resistances were used to parameterize a grid fill factor for a solar cell. In conclusion, this new figure of merit was used to demonstrate that although MNGs have only been employed in low efficiency solar cells, substantial gains in performance are predicted for decreased w in all high efficiency absorber technologies.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1373684
Report Number(s):
NREL/JA-5K00-68990
Journal Information:
Solar Energy Materials and Solar Cells, Vol. 169, Issue C; ISSN 0927-0248
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

References (153)

Metal Nanowire Networks: The Next Generation of Transparent Conductors journal September 2014
A mechanical assessment of flexible optoelectronic devices journal August 2001
Thermal degradation of indium‐tin‐oxide/ p ‐silicon solar cells journal January 1980
Plasma damage-free sputtering of indium tin oxide cathode layers for top-emitting organic light-emitting diodes journal May 2005
Transparent conducting oxides for electrode applications in light emitting and absorbing devices journal November 2010
Quantitative analyses of damp-heat-induced degradation in transparent conducting oxides journal March 2014
Failure of silver nanowire transparent electrodes under current flow journal May 2013
Corrosion at the Nanoscale:  The Case of Silver Nanowires and Nanoparticles journal November 2005
Size-dependent melting point of noble metals journal September 2003
The effect of light and humidity on the stability of silver nanowire transparent electrodes journal January 2015
Time to failure modeling of silver nanowire transparent conducting electrodes and effects of a reduced graphene oxide over layer journal January 2016
Stability of silver nanowire based electrodes under environmental and electrical stresses journal January 2015
Size-dependent melting point depression of nanostructures: Nanocalorimetric measurements journal October 2000
Comparing the Fundamental Physics and Device Performance of Transparent, Conductive Nanostructured Networks with Conventional Transparent Conducting Oxides journal January 2012
Double screen printed metallization of crystalline silicon solar cells as low as 30μm metal line width for mass production journal May 2012
Nanopatterned Metallic Films for Use As Transparent Conductive Electrodes in Optoelectronic Devices journal August 2010
Theoretical comparison of optical and electronic properties of uniformly and randomly arranged nano-porous ultra-thin layers journal January 2015
A broadband plasmonic enhanced transparent conductor journal January 2014
Direct imprinting of thermally reduced silver nanoparticles via deformation-driven ink injection for high-performance, flexible metal grid embedded transparent conductors journal January 2015
Transparent Conducting Silver Nanowire Networks journal May 2012
Uniform Self-Forming Metallic Network as a High-Performance Transparent Conductive Electrode journal October 2013
A New Architecture for Transparent Electrodes: Relieving the Trade-Off Between Electrical Conductivity and Optical Transmittance journal April 2011
A transparent electrode based on a metal nanotrough network journal May 2013
Uniform and Ordered Copper Nanomeshes by Microsphere Lithography for Transparent Electrodes journal March 2014
Transparent Metal Network with Low Haze and High Figure of Merit applied to Front and Back Electrodes in Semitransparent ITO-free Polymer Solar Cells journal May 2015
Large-area soft-imprinted nanowire networks as light trapping transparent conductors journal June 2015
Indium-free, highly transparent, flexible Cu2O/Cu/Cu2O mesh electrodes for flexible touch screen panels journal November 2015
Fabrication of Oxidation-Resistant Metal Wire Network-Based Transparent Electrodes by a Spray-Roll Coating Process journal December 2015
Silver front electrode grids for ITO-free all printed polymer solar cells with embedded and raised topographies, prepared by thermal imprint, flexographic and inkjet roll-to-roll processes journal January 2012
High-Durable AgNi Nanomesh Film for a Transparent Conducting Electrode journal May 2014
Identification and design principles of low hole effective mass p-type transparent conducting oxides journal August 2013
Metal–Insulator–Semiconductor Nanowire Network Solar Cells journal May 2016
Random mesh-like Ag networks prepared via self-assembled Ag nanoparticles for ITO-free flexible organic solar cells journal October 2016
The distributed series resistance problem in solar cells journal August 1984
Theoretical analysis of the series resistance of a solar cell journal August 1967
The effect of the front contact sheet resistance on solar cell performance journal September 2009
Distributed series resistance effects in solar cells journal May 1982
Analytical model for the design principle of large-area solar cells journal February 2012
Analytical models for the series resistance of selective emitters in silicon solar cells including the effect of busbars: Analytical models for the series resistance of selective emitters in silicon solar cells journal August 2013
On the collection of photocurrent in solar cells with a contact grid journal July 1999
Calculation of the resistance of the diffused top layer in a photovoltaic cell journal November 1986
Indium-Tin-Oxide transparent conducting coatings on silicon solar cells and their “figure of merit” journal January 1981
Sheet resistance component of series resistance in a solar cell as a function of grid geometry journal July 1977
Solution‐Grown Cadmium Sulfide Films for Photovoltaic Devices journal September 1992
Chemical Bath Deposition of CdS Thin Films: Electrochemical In Situ Kinetic Studies journal October 1992
Characterization of CdS thin films grown by chemical bath deposition using four different cadmium sources journal September 2008
Effect of the cadmium ion source on the structural and optical properties of chemical bath deposited CdS thin films journal June 1999
Numerical modeling of CdS/CdTe and CdS/CdTe/ZnTe solar cells as a function of CdTe thickness journal August 2007
Effects of junction parameters on Cu(In,Ga)Se2 solar cells journal February 2008
Prospects of novel front and back contacts for high efficiency cadmium telluride thin film solar cells from numerical analysis journal September 2010
New world record Cu(In, Ga)(Se, S)2 thin film solar cell efficiency beyond 22% conference June 2016
Alteration of Cu conductivity in the size effect regime
  • Rossnagel, S. M.; Kuan, T. S.
  • Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, Vol. 22, Issue 1 https://doi.org/10.1116/1.1642639
journal January 2004
A combined graphene and periodic Au nanograte structure: Fundamentals and application as a flexible transparent conducting film in a flexible organic photovoltaic cell journal July 2016
Series resistance and optimum grid design for a thin film solar cell of rectangular shape journal December 1984
Effect of geometric lattice design on optical/electrical properties of transparent silver grid for organic solar cells journal January 2014
Evaluation of ink-jet printed current collecting grids and busbars for ITO-free organic solar cells journal September 2012
Electrohydrodynamic NanoDrip Printing of High Aspect Ratio Metal Grid Transparent Electrodes journal December 2015
Low-Cost Facile Fabrication of Flexible Transparent Copper Electrodes by Nanosecond Laser Ablation journal March 2015
Large-Area Fabrication of Periodic Arrays of Nanoholes in Metal Films and Their Application in Biosensing and Plasmonic-Enhanced Photovoltaics journal September 2010
Transparent conductor based on aluminum nanomesh journal October 2014
Fabrication of Large Area, High-Performance, Transparent Conducting Electrodes Using a Spontaneously Formed Crackle Network as Template journal May 2014
Bio-inspired networks for optoelectronic applications journal November 2014
Solar cell conducting grid structure journal June 1976
Optimization of tapered busses for solar cell contacts journal January 1979
Substrate effects on the transmittance of 1D metal grid transparent electrodes journal January 2014
FDTD simulation of transmittance characteristics of one-dimensional conducting electrodes journal January 2014
Towards understanding the difference of optoelectronic performance between micro- and nanoscale metallic layers journal January 2016
A two-dimensional nanopatterned thin metallic transparent conductor with high transparency from the ultraviolet to the infrared journal October 2012
Modulation of optical transmittance and conductivity by the period, linewidth and height of Au square mesh electrodes journal January 2015
Light absorption mechanism in organic solar cells with hexagonal lattice nanohole aluminum transparent electrodes journal July 2015
Structure, refractive-index dispersion and the optical absorption edge of chemically deposited Zn x Cd (1-x) S thin films journal February 2002
Controlling the Optical Properties of Plasmonic Disordered Nanohole Silver Films journal January 2010
Comparative analysis of opto-electronic performance of aluminium and silver nano-porous and nano-wired layers journal January 2015
Estimation of the volume resistivity of electrically conductive composites journal December 1997
Evaluating conducting network based transparent electrodes from geometrical considerations journal January 2016
Morphology and electrical resistivity of metallic nanostructures journal March 2005
Electron mean free path model for rectangular nanowire, nanofilm and nanoparticle journal April 2014
Developing a theoretical relationship between electrical resistivity, temperature, and film thickness for conductors journal December 2011
Thickness dependent electrical resistivity of ultrathin (<40 nm) Cu films journal March 2001
Size-dependent resistivity of nanometric copper wires journal July 2006
Modeling and simulation of resistivity of nanometer scale copper journal July 2006
Influence of the electron mean free path on the resistivity of thin metal films journal October 2004
Impact of sheet resistance on 2-D modeling of thin-film solar cells journal March 2009
Thin film PV modules for low-concentrating systems journal July 2001
Front contact optimization for Cu(In,Ga)Se/sub 2/ (sub)modules conference January 1996
Past achievements and future challenges in the development of optically transparent electrodes journal November 2012
Transparent electrode requirements for thin film solar cell modules journal January 2011
New figure of merit for transparent conductors journal September 1976
Solution-Grown Silver Nanowire Ordered Arrays as Transparent Electrodes journal December 2015
Invisible metal-grid transparent electrode prepared by electrohydrodynamic (EHD) jet printing journal March 2013
High-Performance Flexible Transparent Electrode with an Embedded Metal Mesh Fabricated by Cost-Effective Solution Process journal March 2016
Cu Mesh for Flexible Transparent Conductive Electrodes journal June 2015
Transparent conductive Ta/Al/Ta-grid electrode for optoelectronic and electromagnetic interference shielding applications journal August 2016
Investigation of surface energy, polarity, and electrical and optical characteristics of silver grids deposited via thermal evaporation method journal January 2016
In Situ Fabrication of Highly Conductive Metal Nanowire Networks with High Transmittance from Deep-Ultraviolet to Near-Infrared journal February 2015
A re-evaluation of transparent conductor requirements for thin-film solar cells journal January 2016
High-Efficiency Crystalline Silicon Solar Cells journal August 2007
Solar cell efficiency tables (version 48): Solar cell efficiency tables (version 48) journal June 2016
Simulation of hetero-junction silicon solar cells with AMPS-1D journal January 2010
Amorphous silicon oxide window layers for high-efficiency silicon heterojunction solar cells journal January 2014
Simulation approach for optimization of device structure and thickness of HIT solar cells to achieve ∼27% efficiency journal February 2013
Analysis of lateral transport through the inversion layer in amorphous silicon/crystalline silicon heterojunction solar cells journal August 2013
An approach for improving the carriers transport properties of a-Si:H/c-Si heterojunction solar cells with efficiency of more than 27% journal October 2013
Achievement of More Than 25% Conversion Efficiency With Crystalline Silicon Heterojunction Solar Cell journal November 2014
Projections of GaAs solar-cell performance limits based on two-dimensional numerical simulation journal May 1989
Controlled formation of GaAs pn junctions during hydride vapor phase epitaxy of GaAs journal August 2012
Computational fluid dynamics-aided analysis of a hydride vapor phase epitaxy reactor journal January 2016
GaAs Solar Cells Grown by Hydride Vapor-Phase Epitaxy and the Development of GaInP Cladding Layers journal January 2016
Low cost GaAs solar cells grown by hydride vapor phase epitaxy and the development of GaInP cladding layers
  • Simon, John; Schulte, Kevin L.; Young, David L.
  • 2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC), 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) https://doi.org/10.1109/PVSC.2015.7355956
conference June 2015
Simulating single-junction GaAs solar cells including photon recycling journal January 2006
Lithium salts as “redox active” p-type dopants for organic semiconductors and their impact in solid-state dye-sensitized solar cells journal January 2013
Improve efficiency of perovskite solar cells by using Magnesium doped ZnO and TiO 2 compact layers journal May 2016
Bulk heterojunction perovskite–PCBM solar cells with high fill factor journal February 2016
Hysteresis-less inverted CH 3 NH 3 PbI 3 planar perovskite hybrid solar cells with 18.1% power conversion efficiency journal January 2015
Conductivity in transparent anatase TiO2 films epitaxially grown by reactive sputtering deposition journal December 2003
Charge Density Dependent Mobility of Organic Hole-Transporters and Mesoporous TiO2 Determined by Transient Mobility Spectroscopy: Implications to Dye-Sensitized and Organic Solar Cells journal May 2013
Improving the TiO 2 electron transport layer in perovskite solar cells using acetylacetonate-based additives journal January 2015
Sub-150 °C processed meso-superstructured perovskite solar cells with enhanced efficiency journal January 2014
Enhanced short-circuit current density of perovskite solar cells using Zn-doped TiO2 as electron transport layer journal December 2016
Interface engineering of highly efficient perovskite solar cells journal July 2014
A three-dimensional metal grid mesh as a practical alternative to ITO journal January 2016
Metal grid/conducting polymer hybrid transparent electrode for inverted polymer solar cells journal May 2010
High optical transmittance of aluminum ultrathin film with hexagonal nanohole arrays as transparent electrode journal January 2016
High transmission nanowire contact arrays with subwavelength spacing journal December 2015
Large area nanoscale metal meshes for use as transparent conductive layers journal January 2015
Transparent Cu nanowire mesh electrode on flexible substrates fabricated by transfer printing and its application in organic solar cells journal June 2010
Organic Solar Cells Using Nanoimprinted Transparent Metal Electrodes journal December 2008
Nanoimprinted Semitransparent Metal Electrodes and Their Application in Organic Light-Emitting Diodes journal May 2007
Electrical resistivity of transparent metal nanomesh electrodes: Electrical resistivity of transparent metal nanomesh electrodes journal November 2012
Fabrication of high aspect ratio nanogrid transparent electrodes via capillary assembly of Ag nanoparticles journal January 2016
Fabrication of a transparent conducting Ni-nanomesh-embedded film using template-assisted Ni electrodeposition and hot transfer process journal January 2016
Enhanced Broadband Optical Transmission Through Ultrathin Metallic Nanomesh journal January 2012
Transparent Aluminum Nanomesh Electrode Fabricated by Nanopatterning Using Self-Assembled Nanoparticles journal February 2011
Optimization of hierarchical structure and nanoscale-enabled plasmonic refraction for window electrodes in photovoltaics journal September 2016
Highly stretchable and transparent nanomesh electrodes made by grain boundary lithography journal January 2014
Patterned 3-dimensional metal grid electrodes as alternative electron collectors in dye-sensitized solar cells journal January 2011
Current Collecting Grids for ITO-Free Solar Cells journal November 2011
High figure-of-merit ultrathin metal transparent electrodes incorporating a conductive grid journal January 2010
Realization of a flexible and mechanically robust Ag mesh transparent electrode and its application in a PDLC device journal January 2016
Metal wire network based transparent conducting electrodes fabricated using interconnected crackled layer as template journal April 2014
Fully transparent organic transistors with junction-free metallic network electrodes journal July 2015
A cracked polymer templated metal network as a transparent conducting electrode for ITO-free organic solar cells journal January 2014
Fabrication of submicron metallic grids with interference and phase-mask holography journal January 2011
Facile fabrication of transparent and conductive nanowire networks by wet chemical etching with an electrospun nanofiber mask template journal January 2014
Pattern transfer of aligned metal nano/microwires as flexible transparent electrodes using an electrospun nanofiber template journal January 2013
Flexible and Transparent Metallic Grid Electrodes Prepared by Evaporative Assembly journal July 2014
Metallic Grid Electrode Fabricated via Flow Coating for High-Performance Flexible Piezoelectric Nanogenerators journal March 2015
Flexible transparent conductive coatings by combining self-assembly with sintering of silver nanoparticles performed at room temperature journal January 2011
Electrode Grids for ITO Free Organic Photovoltaic Devices journal October 2007
Controlled Inkjetting of a Conductive Pattern of Silver Nanoparticles Based on the Coffee-Ring Effect journal October 2013
Self-assembled large scale metal alloy grid patterns as flexible transparent conductive layers journal September 2015
Two-Dimensional Micropatterns via Crystal Growth of Na 2 CO 3 for Fabrication of Transparent Electrodes journal September 2013
Roll-offset printed transparent conducting electrode for organic solar cells journal April 2015

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