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Design and Modeling of Very High-Efficiency Multijunction Solar Cells

Title: Design and Modeling of Very High-Efficiency Multijunction Solar Cells.
Name(s): Bhattacharya, Indranil, author
Foo, Simon Y., professor directing dissertation
Meyer-Baese, Anke, university representative
Zheng, Jim P., committee member
Andrei, Petru, committee member
Li, Hui, committee member
Department of Electrical and Computer Engineering, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2013
Publisher: Florida State University
Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The main challenge in the solar cell industry is making the solar cells more cost effective. Mono and poly-crystalline Si, CdTe, CIGS, Quantum dot, Organic and Dye-sensitized solar cell technologies do not produce high efficiencies. A low bandgap semiconductor generates larger current due to photon absorption over broader spectral region but do not produce high open circuit voltage because it is limited by the dark current of the low bandgap material. This limits them within the Shockley efficiency limit of 30%. The relevant solutions are to increase the efficiency of solar cells, for example by effective spectral splitting by different bandgap semiconductor subcell layers, implementation of III-V direct bandgap optically sensitive and high carrier mobility semiconductors, form better matching (lattice, optical and electrical) between subcell layers, usage of concentrator Fresnel lenses and most importantly reduce the fabrication cost of the epitaxial layers. In this work we introduced two novel quadruple junction solar cell designs, each having four semiconductor subcell layers. We have simulated the quantum efficiency vs. wavelength, current density vs. voltage, power density vs. voltage and compared the photon absorption of our two novel designs with state of art single junction and multijunction solar cells. We showed that antimony based subcell layers help in higher photon absorption in the infrared (IR) region. Photonic modeling is implemented by the transfer-matrix method of wave propagation through multilayer structures. The first quadruple junction solar cell design comprises of AlGaInP (2.3eV) / InGaAs (1.1eV) / GaSb (0.7eV) / InGaSb (0.5eV) and the second design comprises of AlGaInP (2.3eV) / InGaP (1.93eV) / InGaAs (1.1eV) / InGaSb (0.5eV) III-V direct-bandgap semiconductor materials. The quadruple-junction subcell layers capture photons of ultraviolet (UV), visible, and near- and far infrared (IR) regions of the electromagnetic spectrum. The combination of our subcell layers yield favorable photon absorption results in comparison to the state of art solar cells.
Identifier: FSU_migr_etd-7296 (IID)
Submitted Note: A Dissertation submitted to the Department of Electrical and Computer Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Summer Semester, 2013.
Date of Defense: June 20, 2013.
Bibliography Note: Includes bibliographical references.
Advisory Committee: Simon Y. Foo, Professor Directing Dissertation; Anke Meyer-Baese, University Representative; Jim P. Zheng, Committee Member; Petru Andrei, Committee Member; Hui Li, Committee Member.
Subject(s): Electrical engineering
Computer engineering
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Host Institution: FSU

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Bhattacharya, I. (2013). Design and Modeling of Very High-Efficiency Multijunction Solar Cells. Retrieved from