Details

Autor(en) / Beteiligte

• Lenes, Martijn
• Shelton, Steve W.
• Sieval, Alex B.
• Kronholm, David F.
• Hummelen, Jan C. (Kees)
• Blom, Paul W. M.

Titel

Electron Trapping in Higher Adduct Fullerene‐Based Solar Cells

Ist Teil von

• Advanced functional materials, 2009-09, Vol.19 (18), p.3002-3007

Ort / Verlag

Weinheim: WILEY‐VCH Verlag

Erscheinungsjahr

2009

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Here, the performance of bulk‐heterojunction solar cells based on a series of bisadduct analogues of commonly used derivatives of C60 and C70, such PCBMs and their thienyl versions, is investigated. Due to 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 [60]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. The performance of bulk‐heterojunction solar cells based on a series of bis and tris‐adduct analogues of commonly used derivatives of C60 and C70, such as PCBMs and their thienyl versions, is investigated. The solar‐cell characteristics are very similar for all materials, in contrast with a decrease of the electron transport for some of the materials.