Berkeley ELENG C235 - Use of Quantum Dots for Intermediate Band Solar Cells - D2157787

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Berkeley ELENG C235 - Use of Quantum Dots for Intermediate Band Solar Cells

School name University of California, Berkeley

Course Eleng C235- Nanoscale Fabrication

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Slide 1OutlineQuantum Dots are Hot (and Cool)MEG VerificationSelf-Assembly of QDsThe Intermediate BandSchematic ExampleExperimental ResultsSlide 9Slide 10Department of Electrical Engineering and Computer SciencesUniversity of California, Berkeley, CA 94720-1770 USAUse of Quantum Dots for Intermediate Band Solar CellsPeter MatheuEE 235 – “Nanoscale Fabrication”Professor Connie Chang-HasnainMarch 17, 2008EE 235 ‘Nanoscale Fabrication’Peter Matheu 2OutlineIntroduction to quantum dots (QDs) as absorbersMEG, minibands, high VocMotivation behind QW or QD absorbers for solar cellsTheoretical limitThe intermediate band (IB)Experimental results and verificationH.Henry, J. Appl. Phys., 51, 4494 (1980)EE 235 ‘Nanoscale Fabrication’Peter Matheu 3Quantum Dots are Hot (and Cool)Quantum dot absorbers exhibit confinement such that absorption of a photon of energy ≥ 2*Egap can lead to either(a) Hot carriers increasing the Vocor(b) Multiple Exciton Generation (MEG)A. Luque, A. Martie, and A. Nozik, MRS Bulletin, 32, 2007.EE 235 ‘Nanoscale Fabrication’Peter Matheu 4MEG VerificationEE 235 ‘Nanoscale Fabrication’Peter Matheu 5Self-Assembly of QDsPeriodic QDs in close proximity causes the formation of ‘mini-bands’ much like a superlattice of quantum wells.A. Luque, A. Martie, and A. Nozik, MRS Bulletin, 32, 2007.EE 235 ‘Nanoscale Fabrication’Peter Matheu 6The Intermediate BandRestrict the intermediate band physically in the middle of a p-i-n style solar cellMitigates reduction in Voc“2 photon” absorption (VB  IB, IB  CB) for intermediate processTheoretical limit for IBSC approximately 47% - 63% (depending on concentration)EE 235 ‘Nanoscale Fabrication’Peter Matheu 7Schematic ExampleMBE or epi-style thin film growth utilizing the S-K method for self assembly of quantum dotsEE 235 ‘Nanoscale Fabrication’Peter Matheu 8Experimental ResultsA. Luque, A. Martie, and A. Nozik, MRS Bulletin, 32, 2007.EE 235 ‘Nanoscale Fabrication’Peter Matheu 9Experimental ResultsA. Martí, et. al., PRL, 97, 247701, 2006.EE 235 ‘Nanoscale Fabrication’Peter Matheu 10Experimental ResultsR. B. Laghumavarapu, et. al., APL, 90, 173215,

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