Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 14: Organic photovoltaics and electronics - mostly cell design (with DS)

HL 14.6: Vortrag

Montag, 16. März 2015, 16:15–16:30, EW 202

SWNT:Fullerene solar cells — •Alexey Gavrik¹, Stefan Väth¹, Andreas Sperlich¹, Imge Namal², Florian Späth², Tobias Hertel², and Vladimir Dyakonov^1,3 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Physical and Theoretical Chemistry II, Julius Maximilian University of Würzburg, 97074 Würzburg — ³ZAE Bayern, 97074 Würzburg

Single-wall carbon nanotubes (SWNTs) are a promising material for application in organic solar cells due to their attractive properties: solution processability, broadband absorption, high charge carrier mobility. Moreover, by selecting SWNTs of one chirality, it is possible to choose the energy gap, which determines the light absorbtion spectrum and therefore, solar cell performance.

In this study, solar cells were prepared using blends of (6,5)-SWNTs and the soluble fullerene PC₆₀BM. External quantum efficiency (EQE) spectra show spikes at ca. 570, 870 and 1000 nm, which correlates with absorbtion bands of SWNTs. This proves that charge carriers in SWNTs contribute to the photocurrent. Moreover, SWNTs are showing high performance of converting light into electricity: even at low SWNTs:fullerene ratios (1:100) the current from SWNTs in the EQE spectrum is comparable to the fullerenes’ contribution.

This study shows the potential for the application of (6,5)-SWNTs as an active material in organic solar cells. While the device performance is still limited by film thickness and overall device characteristics, we were able to fabricate solar cells with reasonable efficiency.