Charge transport and recombination in low-bandgap bulk heterojunction solar cell using bis-adduct fullerene

Azimi H, Senes A, Scharber MC, Hingerl K, Brabec C (2011)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2011

Journal

Advanced Energy Materials Wiley

Book Volume: 1

Pages Range: 1162-1168

Journal Issue: 6

DOI: 10.1002/aenm.201100331

Abstract

Charge transport and recombination are studied for organic solar cells fabricated using blends of polymer poly[(4,4′-bis(2-ethylhexyl)dithieno[3, 2-b:2′,3′ -d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3- benzothiadiazole)-5,5′-diyl] (Si-PCPDTBT) with [6,6]-phenyl-C -butyric acid methyl ester (mono-PCBM) and the bis-adduct analogue of mono-PCBM (bis-PCBM). The photocurrent of Si-PCPDTBT:bis-PCBM devices shows a strong square root dependence on the effective applied voltage. From the relationship between the photocurrent and the light intensity, we found that the square-root dependence of the photocurrent is governed by the mobility-lifetime ( ) product of charge carriers while space-charge field effects are insignificant. The fill factor (FF) and short circuit current density ( J ) of bis-PCBM solar cells show a considerable increase with temperature as compared to mono-PCBM solar cells. SCLC analysis of single carrier devices proofs that the mobility of both electrons and holes is significantly lowered when replacing mono-PCBM with bis-PCBM. The increased recombination in Si-PCPDTBT:bis-PCBM solar cells is therefore attributed to the low carrier mobilities, as the transient photovoltage measurements show that the carrier lifetime of devices are not significantly altered by using bis-PCBM instead of mono-PCBM. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Authors with CRIS profile

Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET)

Involved external institutions

Konarka Austria Forschungs und Entwicklungs GmbH AT Austria (AT) Johannes Kepler Universität (JKU) Linz AT Austria (AT)

How to cite

APA:

Azimi, H., Senes, A., Scharber, M.C., Hingerl, K., & Brabec, C. (2011). Charge transport and recombination in low-bandgap bulk heterojunction solar cell using bis-adduct fullerene. Advanced Energy Materials, 1(6), 1162-1168. https://doi.org/10.1002/aenm.201100331

MLA:

Azimi, Hamed, et al. "Charge transport and recombination in low-bandgap bulk heterojunction solar cell using bis-adduct fullerene." Advanced Energy Materials 1.6 (2011): 1162-1168.

BibTeX: Download