Details

Autor(en) / Beteiligte

• Meiss, Jan
• Merten, Andre
• Hein, Moritz
• Schuenemann, Christoph
• Schäfer, Stefan
• Tietze, Max
• Uhrich, Christian
• Pfeiffer, Martin
• Leo, Karl
• Riede, Moritz

Titel

Fluorinated Zinc Phthalocyanine as Donor for Efficient Vacuum-Deposited Organic Solar Cells

Ist Teil von

• Advanced functional materials, 2012-01, Vol.22 (2), p.405-414

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2012

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Efficient single bulk heterojunction organic solar cells based on blends of a fluorinated zinc phthalocyanine as electron donor and fullerene C60 as electron acceptor are reported. In comparison to the commonly used absorber zinc phthalocyanine, the fluorination of the molecule to F4ZnPc leads to an increase in ionisation potential and subsequently to an improvement of about 170 mV in the open circuit voltage of organic solar cells, while the short circuit current density and fill factor remain nearly unchanged. Similar to ZnPc:C60‐based devices, the device characteristics of F4ZnPc:C60 solar cells can be further enhanced by improving the blend layer morphology by substrate heating during deposition. F4ZnPc is an efficient donor material that can achieve a 4.6% power conversion efficiency in single heterojunction organic solar cells. Organic solar cells with bulk heterojunctions of C60 as acceptor and either zinc phthalocyanine (ZnPc), or fluorinated ZnPc (F4ZnPc) as donor materials are presented. Substrate heating of F4ZnPc:C60 devices during film deposition strongly increases fill factor and photocurrent. Furthermore, the replacement of ZnPc by F4ZnPc in otherwise identical devices leads to an improvement of open circuit voltage of 30%, increasing the efficiency from 3.3% (ZnPc:C60) to 4.6% (F4ZnPc:C60).