Dr. Benedikt Bläsi Profile

Dr. Benedikt Bläsi

at Fraunhofer-Institut für Solare Energiesysteme

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

photonic micro- and nanostructures , solar energy systems , micro optics

Websites:

Company Website | Personal Website

Publications (36)

PROCEEDINGS ARTICLE | June 5, 2018

Photonic structures for III-V//Si multijunction solar cells with efficiency >33%

Proc. SPIE. 10688, Photonics for Solar Energy Systems VII

KEYWORDS: External quantum efficiency, Solar cells, Gallium arsenide, Silicon, Silicon solar cells, Optical simulations, Nanoimprint lithography, Group III-V semiconductors, Wafer bonding, Multijunction solar cells, Diffraction gratings

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PROCEEDINGS ARTICLE | May 22, 2018

Advanced module optics of textured perovskite silicon tandem solar cells

Proc. SPIE. 10688, Photonics for Solar Energy Systems VII

KEYWORDS: Optical properties, Solar cells, Interfaces, Silicon, Reflectivity, Silicon solar cells, Systems modeling, Tandem solar cells, Absorption, Perovskite

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PROCEEDINGS ARTICLE | May 22, 2018

Nanoimprinted sol-gel materials for antireflective structures on silicon solar cells

Proc. SPIE. 10688, Photonics for Solar Energy Systems VII

KEYWORDS: Refractive index, Antireflective coatings, Reflection, Silicon, Silicon solar cells, Sol-gels, Nanoimprint lithography

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PROCEEDINGS ARTICLE | April 28, 2017

Interference and nanoimprint lithography for the patterning of large areas

Proc. SPIE. 10115, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics X

KEYWORDS: Lithography, Photovoltaics, Light emitting diodes, Optical lithography, Etching, Solar cells, Silicon, Diffusion, Argon ion lasers, Atomic force microscopy, Silicon solar cells, Nanoimprint lithography, Display technology, Semiconducting wafers

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PROCEEDINGS ARTICLE | April 29, 2016

Efficient optical analysis of surface texture combinations for silicon solar cells

Proc. SPIE. 9898, Photonics for Solar Energy Systems VI

KEYWORDS: Optical properties, Scattering, Matrices, Glasses, Solar cells, Solar cells, Interfaces, Silicon, Light scattering, Reflectivity, Optical analysis, Silicon solar cells, Optical simulations, Geometrical optics, Matrix multiplication, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | April 29, 2016

Rear side gratings for silicon solar cells: efficiency enhancement finally demonstrated

Proc. SPIE. 9898, Photonics for Solar Energy Systems VI

KEYWORDS: Amorphous silicon, Near infrared, Modeling, External quantum efficiency, Solar cells, Silicon, Silicon solar cells, Nanoimprint lithography, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | April 29, 2016

Nanoparticle scattering for multijunction solar cells

Proc. SPIE. 9898, Photonics for Solar Energy Systems VI

KEYWORDS: Semiconductors, Antireflective coatings, External quantum efficiency, Nanoparticles, Metals, Solar cells, Germanium, Diffusion, Light scattering, Reflectivity, Aluminum, Nanoimprint lithography, Solar radiation, Statistical modeling, Electro optical modeling, Prototyping, Multijunction solar cells

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PROCEEDINGS ARTICLE | April 27, 2016

Large area patterning using interference and nanoimprint lithography

Proc. SPIE. 9888, Micro-Optics 2016

KEYWORDS: Fabrication, Electron beam lithography, Etching, Silicon, Argon ion lasers, Micro optics, Light sources and illumination, Double patterning technology, Semiconducting wafers, Diffraction gratings

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PROCEEDINGS ARTICLE | September 23, 2015

Optical properties of textured sheets: an efficient matrix-based modelling approach

Proc. SPIE. 9630, Optical Systems Design 2015: Computational Optics

KEYWORDS: Wafer-level optics, Modeling, Reflectors, Optical properties, Matrices, Solar cells, Silicon, Reflectivity, Optical simulations, Geometrical optics

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SPIE Journal Paper | July 29, 2015

Development of nanoimprint processes for photovoltaic applications

Hubert Hauser, Nico Tucher, Katharina Tokai, Patrick Schneider, Christine Wellens, Anne Volk, Sonja Seitz, Jan Benick, Simon Barke, Frank Dimroth, Claas Müller, Thomas Glinsner, Benedikt Bläsi

JM3 Vol. 14 Issue 03

KEYWORDS: Nanoimprint lithography, Silicon, Solar cells, Photovoltaics, Etching, Semiconducting wafers, Absorption, Optical lithography, Silicon solar cells, Plasma etching

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PROCEEDINGS ARTICLE | March 19, 2015

Development of NIL processes for PV applications

Proc. SPIE. 9423, Alternative Lithographic Technologies VII

KEYWORDS: Photovoltaics, Optical lithography, Etching, Solar cells, Silicon, Silicon solar cells, Plasma etching, Nanoimprint lithography, Semiconducting wafers, Absorption

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PROCEEDINGS ARTICLE | May 15, 2014

Novel light trapping concepts for crystalline silicon solar cells using diffractive rear side structures

Proc. SPIE. 9140, Photonics for Solar Energy Systems V

KEYWORDS: Amorphous silicon, Diffraction, Antireflective coatings, Optical spheres, Solar cells, Crystals, Dielectrics, Silicon, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | May 15, 2014

Study of plasmonic nanoparticle arrays for photon management in solar cells

Proc. SPIE. 9140, Photonics for Solar Energy Systems V

KEYWORDS: Plasmonics, Polarization, Nanoparticles, Glasses, Particles, Solar cells, Silicon, Silver, Nanoimprint lithography, Absorption

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PROCEEDINGS ARTICLE | May 15, 2014

The photonic solar cell: system design and efficiency estimations

Proc. SPIE. 9140, Photonics for Solar Energy Systems V

KEYWORDS: Mirrors, Solar cells, Crystals, Dielectrics, Gallium arsenide, Photonic crystals, Photonics systems, Thin film solar cells, Solar energy systems, Absorption

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PROCEEDINGS ARTICLE | September 25, 2013

Photonic structures for enhanced upconversion

Proc. SPIE. 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV

KEYWORDS: Refractive index, Solar energy, Luminescence, Photons, Energy transfer, Ions, Silicon, Quantum efficiency, Upconversion, Absorption

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PROCEEDINGS ARTICLE | October 12, 2012

Nano-imprinted rear-side diffraction gratings for absorption enhancement in solar cells

Proc. SPIE. 8471, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III

KEYWORDS: Reflectors, Lithography, Silica, Solar cells, Silicon, Aluminum, Nanoimprint lithography, Semiconducting wafers, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | May 2, 2012

Comparison of periodic and random structures for scattering in thin-film microcrystalline silicon solar cells

Proc. SPIE. 8438, Photonics for Solar Energy Systems IV

KEYWORDS: Thin films, External quantum efficiency, Scattering, Solar cells, Silicon, Light scattering, Atomic force microscopy, Thin film solar cells, Silicon solar cells, Absorption

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PROCEEDINGS ARTICLE | May 2, 2012

Photon management structures for solar cells

Proc. SPIE. 8438, Photonics for Solar Energy Systems IV

KEYWORDS: Lithography, Etching, Particles, Solar cells, Silicon, Photoresist materials, Photomasks, Nanoimprint lithography, Semiconducting wafers, Absorption

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Since micro- and nanostructures for photon management are of increasing importance in novel high-efficiency solar cell concepts, structuring techniques with up-scaling potential play a key role in their realization. Interference lithography and nanoimprint processes are presented as technologies for origination and replication of fine-tailored photonic structures on large areas. At first, these structure origination and replication technologies are presented in detail: With the interference pattern of two or more coherent waves, a wide variety of structures with feature sizes ranging from 100 nm to 100 μm can be generated in photoresist by interference lithography. Examples are linear gratings, crossed gratings, hexagonal structures, three dimensional photonic crystals or surface-relief diffusers. The strength of this technology is that homogeneous structures can be originated on areas of up to 1.2 x 1.2 m<sup>2</sup>. The structures in photoresist, the so-called master structures, can serve as an etching mask for a pattern transfer, as a template for infiltration with different materials or they can be replicated via electroplating and subsequent replication processes. Especially in combination with replication steps, the industrially feasible production of elaborate structures is possible. As a particularly interesting process, nanoimprint lithography (NIL) is described in detail. As a way towards industrial production, a roller NIL tool is presented. After the description of the basic technologies, three application examples for solar cells are presented with details about the design of the structures, the structuring processes, sample characterization and evaluation: (1) honeycomb structures for the front side texturization of multicrystalline silicon wafer solar cells, (2) diffractive rear side gratings for absorption enhancement in the spectral region near the band gap of silicon, and (3) plasmonic metal nanoparticle arrays manufactured by combined imprint and lift off processes.

PROCEEDINGS ARTICLE | May 2, 2012

Preparation of periodically arranged metallic nanostructures using nanoimprint lithography

Proc. SPIE. 8438, Photonics for Solar Energy Systems IV

KEYWORDS: Lithography, Nanostructures, Nanoparticles, Particles, Solar cells, Silicon, Silver, Platinum, Nanoimprint lithography, Absorption

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PROCEEDINGS ARTICLE | May 2, 2012

Effects of photonic structures on upconversion

Proc. SPIE. 8438, Photonics for Solar Energy Systems IV

KEYWORDS: Refractive index, Finite-difference time-domain method, Ions, Quantum efficiency, Photonic crystals, Silicon solar cells, Erbium, Upconversion, Absorption, Structured photonic materials

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PROCEEDINGS ARTICLE | May 2, 2012

Optimization of angularly selective photonic filters for concentrator photovoltaic

Proc. SPIE. 8438, Photonics for Solar Energy Systems IV

KEYWORDS: Thin films, Photovoltaics, Optical filters, Refractive index, Solar concentrators, Reflection, Solar cells, Gallium arsenide, Photonic crystals, Optical simulations

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PROCEEDINGS ARTICLE | February 8, 2012

Increasing upconversion by metal and dielectric nanostructures

Proc. SPIE. 8256, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices

KEYWORDS: Gold, Nanostructures, Waveguides, Nanoparticles, Metals, Luminescence, Dielectrics, Quantum efficiency, Upconversion, Absorption

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PROCEEDINGS ARTICLE | September 21, 2011

Towards photonic luminescent solar concentrators

Proc. SPIE. 8111, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion II

KEYWORDS: Refractive index, Multilayers, Finite-difference time-domain method, Solar concentrators, Polymethylmethacrylate, Reflection, Polymers, Photonic crystals, Polymer thin films, Absorption

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PROCEEDINGS ARTICLE | May 18, 2010

Enhanced light trapping in thin amorphous silicon solar cells by directionally selective optical filters

Proc. SPIE. 7725, Photonics for Solar Energy Systems III

KEYWORDS: Amorphous silicon, Optical filters, External quantum efficiency, Glasses, Solar cells, Photons, Reflectivity, Transparent conductors, Absorption filters, Absorption

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PROCEEDINGS ARTICLE | May 18, 2010

Increasing fluorescent concentrator light collection efficiency by restricting the angular emission characteristic of the incorporated luminescent material: the 'Nano-Fluko' concept

Proc. SPIE. 7725, Photonics for Solar Energy Systems III

KEYWORDS: Reflectors, Optical filters, Solar concentrators, Polymethylmethacrylate, Waveguides, Reflection, Solar cells, Indium gallium phosphide, Absorption, Structured photonic materials

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PROCEEDINGS ARTICLE | May 18, 2010

Realization and evaluation of diffractive systems on the back side of silicon solar cells

Proc. SPIE. 7725, Photonics for Solar Energy Systems III

KEYWORDS: Nanostructures, External quantum efficiency, Silica, Nanoparticles, Solar cells, Silicon, Reflectivity, Silicon solar cells, Nanolithography, Absorption

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PROCEEDINGS ARTICLE | May 18, 2010

Photonic crystals in solar cells: a simulation approach

Proc. SPIE. 7725, Photonics for Solar Energy Systems III

KEYWORDS: Diffraction, Optical properties, Solar cells, Crystals, Photonic crystals, Silicon solar cells, Ray tracing, Optical simulations, Device simulation, Absorption

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PROCEEDINGS ARTICLE | May 13, 2010

Nanoimprint lithography for solar cell texturisation

Proc. SPIE. 7716, Micro-Optics 2010

KEYWORDS: Lithography, Etching, Solar cells, Silicon, Reflectivity, Photomasks, Plasma etching, Nanoimprint lithography, Reactive ion etching, Semiconducting wafers

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PROCEEDINGS ARTICLE | May 5, 2008

Design of photonic structures for the enhancement of the light guiding efficiency of fluorescent concentrators

Proc. SPIE. 7002, Photonics for Solar Energy Systems II

KEYWORDS: Optical filters, Refractive index, Solar concentrators, Optical spheres, Reflection, Solar cells, Optical coatings, Reflectivity, Photonic crystals, Absorption

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PROCEEDINGS ARTICLE | May 12, 2006

Rigorous validation of the lateral Goos-Hänchen shift in microstructured sun shading systems

Proc. SPIE. 6197, Photonics for Solar Energy Systems

KEYWORDS: Diffraction, Prisms, Sun, Interfaces, Electromagnetic radiation, Numerical analysis, Near field, Refraction, Transmittance, Diffraction gratings

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PROCEEDINGS ARTICLE | October 4, 2005

Functional substrates for flexible organic solar cells

Proc. SPIE. 5938, Organic Photovoltaics VI

KEYWORDS: Gold, Thin films, Photovoltaics, Holography, Organic photovoltaics, Electrodes, Metals, Solar cells, Resistance, Absorption

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PROCEEDINGS ARTICLE | May 6, 2005

Maskless origination of microstructures with optical functions on large areas

Proc. SPIE. 5751, Emerging Lithographic Technologies IX

KEYWORDS: Optical components, Lithography, Lenses, Polymers, Glasses, Silicon, Photoresist materials, Photomicroscopy, Solar energy systems, Optics manufacturing

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SPIE Journal Paper | November 1, 2004

Some application cases and related manufacturing techniques for optically functional microstructures on large areas

Andreas Gombert, Benedikt Bläsi, Chiristopher Bühler, Peter Nitz, Jörg Mick, Wolfgang Hoßfeld, Michael Niggemann

OE Vol. 43 Issue 11

KEYWORDS: Antireflective coatings, Photoresist materials, Optics manufacturing, Lithography, Compound parabolic concentrators, Sun, Refractive index, Diffusers, Solar cells, Polymers

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PROCEEDINGS ARTICLE | September 8, 2004

Large-area origination and replication of microstructures with optical functions

Proc. SPIE. 5454, Micro-Optics: Fabrication, Packaging, and Integration

KEYWORDS: Lithography, Optical properties, Polymers, Ultraviolet radiation, Nickel, Coating, Manufacturing, Photoresist materials, Transmittance, Photoresist developing

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PROCEEDINGS ARTICLE | December 29, 2003

Replicated microstructures with optical functions in solar and display applications

Proc. SPIE. 5184, Physics, Theory, and Applications of Periodic Structures in Optics II

KEYWORDS: Lithography, Refractive index, Antireflective coatings, Prisms, Sun, Polymers, Solar cells, Photoresist materials, Diffusers, Compound parabolic concentrators

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PROCEEDINGS ARTICLE | December 26, 2001

Periodic microstructures for large area applications generated by holography

Proc. SPIE. 4438, Physics, Theory, and Applications of Periodic Structures in Optics

KEYWORDS: Refractive index, Antireflective coatings, Holography, Polymers, Particles, Nickel, Photoresist materials, Optics manufacturing, Photoresist developing, Diffraction gratings

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Showing 5 of 36 publications

Conference Committee Involvement (5)