Electron trapping in higher adduct fullerene-based solar cells

article





Lenes, M.

Shelton, S.W.

Sieval, A.B.

Kronholm, D.F.

Hummelen, J.C.

Blom, P.W.M.
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.
Topics

















Bis-adductsBulk heterojunctionDevice performanceElectron transportElectron trappingLowest unoccupied molecular orbitalShallow trapsSolar cell performanceCell membranesElectron mobilityElectronsHeterojunctionsIsomersMolecular orbitalsOpen circuit voltagePhotovoltaic cellsSolar cellsFullerenes
TNO Identifier
461645
Repository link
https://resolver.tno.nl/uuid:33920b4e-53b8-4ea5-a9ac-5d8eeebee537
ISSN
1616301X
Source
Advanced Functional Materials, 19(18), pp. 3002-3007.
Collation
6 p.
Pages
3002-3007
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