Enhanced absorbance and electron collection in inverted organic solar cells: Optical admittance and transient photocurrent analyses |
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| Affiliation: | 1. Department of Chemistry, National University of Singapore, 3 Science Drive, Singapore 117543, Singapore;2. Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore;3. Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong;1. Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;2. Center for Physical Sciences and Technology, Savanoriu 231, LT-02300 Vilnius, Lithuania;3. Department of Chemistry, Physical Chemistry, University of Cologne, Luxemburgerstr. 116, 50939 Cologne, Germany;1. Department of Chemical Engineering, University of Rochester, Rochester, NY 14627, USA;2. Department of Chemistry, University of Rochester, Rochester, NY 14627, USA;1. Institute of Metal Research Chinese Academy of Sciences, Shenyang 110016, China;2. Alan G. MacDiarmid Lab College of Chemistry, Jilin University, Changchun 130023, China;1. Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611-6400, United States;2. Plextronics Inc., Pittsburgh, PA 15238, United States |
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| Abstract: | Optical admittance analysis reveals that light absorption in inverted organic solar cells (OSCs), based on the same polymer blend layer of regio-regular poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM), is always greater than their regular geometry OSCs fabricated using an ITO/poly(3,4-ethylene dioxythiophene):(polystyrene sulfuric acid) anode. Transient photocurrent measurements elucidate that interfacial exciton dissociation at the cathode interfaces of Al-modified ITO/PCBM (inverted cell) and Al/PCBM (regular cell) is not equivalent. It is shown that the reverse configuration allows improving the absorbance of the cell, favoring charge collection at cathode/PCBM interface and also possessing a dawdling degradation behavior as compared to a control regular OSC in the accelerated aging test. |
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| Keywords: | Organic solar cells Lifetime Optical admittance analysis Transient photocurrent |
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