Light-trapping enhancement in thin film solar cells with photonic crystals

dc.contributor.advisor Rana Biswas
dc.contributor.advisor Gary Tuttle
dc.contributor.advisor Vikram Dalal
dc.contributor.author Zhou, Dayu
dc.contributor.department Electrical and Computer Engineering
dc.date 2018-08-22T17:42:02.000
dc.date.accessioned 2020-06-30T07:44:47Z
dc.date.available 2020-06-30T07:44:47Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.issued 2008-01-01
dc.description.abstract <p>Photovoltaics (or solar cell) has been an active area for research and development, driven by the world's constantly increasing needs for power. Among the current solar technologies, thin film solar cell promises lower cost, but at the expense of lower power conversion efficiency. The efficiency of thin film solar cell can be improved using light confinement schemes commonly referred to as light-trapping. In this thesis, we develop novel light-trapping schemes utilizing photonic crystals (PCs). The optical modeling is performed with a rigorous scattering matrix approach, where Maxwell's equations are solved in Fourier space, and simulations are carried out on parallel computation environment. Although the concepts apply to any thin film solar cell structures, hydrogenated amorphous silicon (a-Si:H) single junction thin film solar cell is used for simulation due to widely available optical property data.;In the solar cell structure we design, a one dimensional (1D) photonic crystal or distributed Bragg reflector (DBR) is used as back reflector. The DBR consists of alternating layers of SiO2 and Si or Indium Tin Oxide (ITO) and Si to provide high reflectivity with little loss. A layer of two dimensional (2D) photonic crystal slab between the a-Si:H absorber layer and the DBR can diffract light at oblique angles, so that total internal reflection can occur inside the absorber layer. The light path length inside the absorber layer will be greatly increased, so will the absorption. The parameters for photonic crystals are optimized through computer simulations to obtain the maximum absorption and path length enhancement. The simulations show significantly enhanced photon harvesting between 600--775 nm below the band edge. The path length enhancement can reach several hundred at resonant peaks, far exceeding the classical limit predicted for randomly roughened scattering surfaces.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/15473/
dc.identifier.articleid 16472
dc.identifier.contextkey 7029087
dc.identifier.doi https://doi.org/10.31274/rtd-180813-16695
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/15473
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/69109
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/15473/1454666.PDF|||Fri Jan 14 20:41:29 UTC 2022
dc.subject.disciplines Electrical and Electronics
dc.subject.disciplines Energy Systems
dc.subject.disciplines Oil, Gas, and Energy
dc.subject.disciplines Power and Energy
dc.subject.keywords Electrical and computer engineering;Electrical engineering
dc.title Light-trapping enhancement in thin film solar cells with photonic crystals
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication a75a044c-d11e-44cd-af4f-dab1d83339ff
thesis.degree.level thesis
thesis.degree.name Master of Science
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