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Analysis of the dynamic short-circuit resistance in organic bulk-heterojunction solar cells: relation to the charge carrier collection efficiency |
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| Authors: | C Voz J Puigdollers JM Asensi S Galindo S Cheylan R Pacios P Ortega R Alcubilla |
| Affiliation: | 1. Grup de Recerca en Micro i Nanotecnologia, Departament d’Enginyeria Electrònica, Universitat Politècnica de Catalunya, c/Jordi Girona 1-3, 08034 Barcelona, Spain;2. Grup d’Energia Solar, Departament de Física Aplicada i Òptica, Universitat de Barcelona, Avda. Diagonal 647, 08028 Barcelona, Spain;3. Institut de Ciències Fotòniques, Mediterranean Technology Park, Av. Canal Olimpic s/n, 08860 Castelldefels, Spain;4. Department of Microsystems, IK4-IKERLAN S. Coop., Polo de Innovación Garaia, Goiru 9, 20500 Arrasate-Mondragon, Spain |
| Abstract: | This work studies the charge carrier collection efficiency in organic bulk-heterojunction solar cells based on polymer:fullerene blends. An equivalent circuit with a specific recombination term is proposed to describe the behavior of this type of devices. It is experimentally shown that this recombination term determines the slope of the current–voltage characteristic at the short-circuit condition. The variation of this dynamic resistance with the light intensity can be interpreted considering a dominant first-order recombination process. Finally, an analytical model under a constant electric field approximation is presented that can be used to calculate the charge carrier collection efficiency of the device. This model can be also used to estimate an effective mobility–lifetime product, which is characteristic of the quality of the active layer. |
| Keywords: | Bulk-heterojunction Organic Solar cell Collection Recombination |
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