Cyanine tandem and triple-junction solar cells |
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| Affiliation: | 1. Empa, Swiss Federal Institute for Materials Science and Technology, Laboratory for Functional Polymers, Dübendorf CH-8600, Switzerland;2. Ecole Polytechnique Fédérale de Lausanne (EPFL), IMT, Photovoltaics and Thin Film Electronics Laboratory, Breguet 2, Neuchâtel CH-2000, Switzerland;3. Empa, Swiss Federal Institute for Materials Science and Technology, Reliability Science and Technology, Dübendorf CH-8600, Switzerland;4. Empa, Swiss Federal Institute for Materials Science and Technology, Electron Microscopy Center, Dübendorf CH-8600, Switzerland;5. Institut des Matériaux, Ecole Polytechnique Fédérale de Lausanne, EPFL, Station 12, Lausanne CH-1015, Switzerland;1. CAS Key Laboratory of Biomedical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Science (CAS), 88 Keling Road, Suzhou 215163, China;2. Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China;3. Department of Chemical and Biomolecular Engineering, Lafayette College, Easton 18042, PA, USA;1. Center for Advanced Materials, Qatar University, P O Box 2713, Doha, Qatar;2. Chemistry and Earth Sciences Department, College of Arts and Sciences, Qatar University, Doha 2713, Qatar;3. Materials Science & Technology Program (MATS), College of Arts & Sciences, Qatar University, Doha 2713, Qatar |
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| Abstract: | Ultrathin bilayer heterojunction solar cells using cyanine electron donors and electron acceptor C60 are used to fabricate monolithically stacked tandem and triple junction devices. Sub-cell stack sequences as well as C60 layer thicknesses are optimized by optical modeling and maximum efficiency is corroborated experimentally. The highest power conversion efficiency of 4.3% under full sun irradiation is achieved with a tandem cell where heptamethine and trimethine cyanine dyes are used in the front and back cell, respectively. The open circuit voltage matches the sum of the two respective open circuit voltages of the individual single junction solar cells within 3%. Triple junction cells using an additional sub-cell with a pentamethine cyanine suffer from electrical series resistance. At low light irradiation intensity, however, both triple and tandem solar cells reach power conversion efficiencies above 5% in agreement with the performance increase predicted from numerical simulation. |
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| Keywords: | Organic photovoltaics Tandem cell Triple junction solar cell Cyanine dyes Intermediate layer |
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