Electron trapping in higher adduct fullerene-based solar cells
| Autor: | Lenes, M., Shelton, S.W., Sieval, A.B., Kronholm, D.F., Hummelen, J.C., Blom, P.W.M. |
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| Přispěvatelé: | TNO Industrie en Techniek |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Solar cells
Electron mobility Open circuit voltage Industrial Innovation Bulk heterojunction Electron transport Lowest unoccupied molecular orbital Photovoltaic cells Device performance Electrons Solar cell performance Cell membranes Isomers Bis-adducts Shallow traps Molecular orbitals Heterojunctions Fullerenes Electronics Electron trapping |
| Zdroj: | Advanced Functional Materials, 18, 19, 3002-3007 |
| Popis: | Here, the performance of bulk-heterojunction solar cells based on a series of bisadduct analogues of commonly used derivatives of C60 and C 70, such PCBMs and theirthienyl versions, is investigated. Dueto their higher lowest unoccupied molecular orbital an increase in open-circuit voltage and thus performance is expected. It is shown that the occurrence of a multitude of different isomers results in a decrease in the electron transport for some of the materials. Surprisingly, the solar-cell characteristics are very similar for all materials. This apparent discrepancy is explained by a significant amount of shallow trapping occurring in the fullerene phase that does not hamper the solar cell performance due the filling of these shallow traps during illumination. Furthermore, the trisadduct analogue of [6O]PCBM has been investigated, which, despite an even further increase in open-circuit voltage, results in a significantly reduced device performance due to a strong deterioration of the electron mobility in the fullerene phase. © 2009 WILEY-VCH Verlag GmbH & Co. KCaA. |
| Databáze: | OpenAIRE |
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