A-D-A-Type Oligothiophenes Containing Benzothiadiazole Terminal Units for Small Molecule Organic Solar Cells

• Autorzy: Simon Steinberger , Amaresh Mishra , Gisela Schulz , Christian Uhrich , Martin Pfeiffer , Peter Bäuerle
• Języki publikacji: EN

Abstrakty

EN

The electron-deficient, fused-heterocyclebenzo[c][1,2,5]thiadiazole (BTDA) is investigated as acceptor group in A-D-A-type oligothiophenes in order to correlate their relative acceptor strength with opto-electronic and photovoltaic properties. In this respect, two novel BDTA-capped oligothiopheneswere synthesized and characterized by optical and electrochemical measurements. They showed broad absorptions in the visible spectrum and HOMO-LUMO energies well suited for organic solar cells. The attachment of terminal BTDA acceptor units to the conjugated oligothiophene backbone resulted in a hypsochromic shift in UV-Vis absorption and larger band gap in comparison to previously reported analogous dicyanovinylene (DCV)-substituted oligothiophenes indicating that BDTA is a weaker acceptor than DCV. Vacuumprocessed m-i-p (metal-intrinsic-p-doped)-type bilayer solar cells using these co-oligomers as donor and C60 as acceptor gave moderate power conversion efficiencies of around 1.0%. Bulk-heterojunction (BHJ) solar cells prepared by solution-processing using fullerene PC61BM as acceptor generated slightly lower efficiencies of 0.9%, whichwere increased to 1.5% by using the higher fullerene PC71BM. It was found that the cell efficiencies were mostly limited by the low photocurrent densities due to moderate light absorption in the bilayer devices and low fill factors coming from inefficient charge transport in the solutionprocessed BHJ devices.

• Czasopismo: Organic Photonics and Photovoltaics
• Rocznik: 2014
• Tom: 2
• Numer: 1

Daty

otrzymano

2014-04-01

zaakceptowano

2014-05-21

online

2014-10-20

Twórcy

autor

Simon Steinberger

• Institut für Organische Chemie und Neue Materialien, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany

autor

Amaresh Mishra

• Institut für Organische Chemie und Neue Materialien, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany

autor

Gisela Schulz

• Institut für Organische Chemie und Neue Materialien, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany

autor

Christian Uhrich

• Heliatek GmbH, Treidlerstrasse 3, 01139 Dresden, Germany

autor

Martin Pfeiffer

• Heliatek GmbH, Treidlerstrasse 3, 01139 Dresden, Germany

autor

Peter Bäuerle

• Institut für Organische Chemie und Neue Materialien, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany

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Identyfikatory

DOI

10.2478/oph-2014-0005