Influence of Chirped DBR Reflector on the Absorption Efficiency of Multi-nanolayer Photovoltaic Structures: Wavelength-scale Analysis by the Method of Single Expression

An electromagnetic wavelength-scale analysis of the optical characteristics of multi-nanolayer photovoltaic (PV) structures: without an antireflection coating, with an antireflection coating on the top of the structure, and with both the antireflection coating on the top and a broadband non-periodic (chirped) distributed Bragg reflector (DBR) on the bottom of the structure is performed. All the PV structures studied are based on a Si p-i-n type absorber supported by a metallic layer (Cu) and SiO2 substrate. The top-to-bottom electromagnetic analysis is performed numerically by the method of single expression (MSE). Absorbing and reflecting characteristics of the multi-nanolayer PV structures are obtained. The influence of the thicknesses and permittivities of the layers of the PV structures on the absorbing characteristics of the structures is analyzed to reveal favourable configurations for enhancement of their absorption efficiency. The localizations of the electric component of the optical field and the power flow distribution within all the PV structures considered are obtained to confirm an enhancement of the absorption efficiency in the favorable configuration. The results of the electromagnetic wavelength-scale analysis undertaken will have scientific and practical importance for optimizing the operation of thin-filmmulti-nanolayer PV structures incorporating a chirped DBR reflector with regards to enhancing their efficiency.

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Absorption loss influence on optical characteristics of multilayer distributed Bragg reflector: wavelength-scale analysis by the method of single expression

Opto-Electronics Review ◽

10.2478/s11772-010-0049-0 ◽

2010 ◽

Vol 18 (4) ◽

Cited By ~ 15

Author(s):

H.V. Baghdasaryan ◽

T.M. Knyazyan ◽

T.H. Baghdasaryan ◽

B. Witzigmann ◽

F. Roemer

Keyword(s):

Power Flow ◽

Normal Incidence ◽

Bragg Reflector ◽

Flow Density ◽

Problem Solution ◽

Absorption Loss ◽

Distributed Bragg Reflector ◽

Method Of Single Expression ◽

Quarter Wave ◽

Wavelength Scale

AbstractElectrodynamical model of a classical distributed Bragg reflector (DBR) consisting of alternating quarter-wave layers of high and low permittivity is considered at the plane wave normal incidence. Reflective characteristics of DBR possessing absorption loss in constituting layers are analysed via correct wavelength-scale boundary problem solution by the method of single expression (MSE). Analysis of optical field and power flow density distributions within the lossy DBR structures explained the peculiarities of their reflective characteristics. Optimal configurations of lossless and lossy DBRs are revealed. Specific DBR structures possessing full transparency at definite number of layers are also analysed.

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Double-Barrier Resonant Tunneling in Nano-Optics and Quantum Mechanics: Wavelength-Scale Analysis by the Method of Single Expression

2019 21st International Conference on Transparent Optical Networks (ICTON) ◽

10.1109/icton.2019.8840538 ◽

2019 ◽

Cited By ~ 1

Author(s):

Hovik V. Baghdasaryan ◽

Tamara M. Knyazyan ◽

Tamara T. Hovhannisyan ◽

Marian Marciniak

Keyword(s):

Quantum Mechanics ◽

Resonant Tunneling ◽

Scale Analysis ◽

Double Barrier ◽

Method Of Single Expression ◽

Wavelength Scale ◽

Double Barrier Resonant Tunneling

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Wavelength-scale analysis of optical field localisation at plasmonic resonance in non-linear Kretschmann structure by the method of single expression

2010 12th International Conference on Transparent Optical Networks ◽

10.1109/icton.2010.5549282 ◽

2010 ◽

Cited By ~ 8

Author(s):

Hovik V. Baghdasaryan ◽

Tamara M. Knyazyan ◽

Tamara T. Hovhannisyan ◽

Marian Marciniak

Keyword(s):

Optical Field ◽

Scale Analysis ◽

Plasmonic Resonance ◽

Method Of Single Expression ◽

Non Linear ◽

Wavelength Scale

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Surface plasmon interaction with amplifying MQWs in multilayer kretschmann structure: Wavelength-scale analysis by the method of single expression

2012 14th International Conference on Transparent Optical Networks (ICTON) ◽

10.1109/icton.2012.6254497 ◽

2012 ◽

Cited By ~ 2

Author(s):

Hovik V. Baghdasaryan ◽

Tamara M. Knyazyan ◽

Tamara T. Hovhannisyan ◽

Marian Marciniak

Keyword(s):

Surface Plasmon ◽

Scale Analysis ◽

Method Of Single Expression ◽

Wavelength Scale ◽

Plasmon Interaction

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Harvesting Photons in Thin Film Solar Cells with Photonic Crystals

MRS Proceedings ◽

10.1557/proc-1101-kk08-02 ◽

2008 ◽

Vol 1101 ◽

Author(s):

Dayu Zhoue ◽

Rana Biswas

Keyword(s):

Thin Film ◽

Solar Cell ◽

Photonic Crystal ◽

Photonic Crystals ◽

Antireflection Coating ◽

Bragg Reflector ◽

Square Lattice ◽

Near Band Edge ◽

Distributed Bragg Reflector ◽

Solar Cell Performance

AbstractEnhanced light absorption and improved photon harvesting is a major avenue to improving solar cell performance. We simulate and design photonic crystal based loss-less back reflectors. The photonic crystal is a 2-dimensional photonic crystal combined with a distributed Bragg reflector. We have designed and simulated a thin film a-Si:H solar cell with the photonic crystal reflector and an antireflection coating. The photonic crystal has square lattice symmetry and generates strong diffraction of near band edge photons in the absorber layer. The absorption of red and near-IR photons is increased by more than an order of magnitude by the photonic crystal. The photonic crystals are composed of ITO and can easily serve as a conducting back contact. This scheme can be easily extended to other solar absorber layers. We have optimized the geometry of the photonic crystal to maximize absorption using rigorous scattering matrix simulations. The optical path length with the photonic crystal can improve over the limit for a random roughened scattering surface.

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