Showing papers by "Thomas Fromherz published in 2000"
Journal Article•
TL;DR: In this article, a large area photovoltaic device based on interpenetrating networks of donor and acceptor molecules has been fabricated by using the doctor blade technique, and it has been shown that upscaling to 10×15 cm is possible without loosing efficiency.
Abstract: Large area photovoltaic devices based on interpenetrating networks of donor and acceptor molecules have been fabricated by using the doctor blade technique. Devices containing blends of poly (para phenylenevinylene, PPV) derivatives as donor materials with various C60 derivatives as acceptors are compared. It is shown that among the various combinations of materials short circuit currents are maximal for blends of PPV and a highly soluble fullerene derivative (PCBM monoadduct), whereas the open circuit potentials stay almost the same for all devices. For the best combination of donor - acceptor materials it has been shown that upscaling to 10×15 cm is possible by using the doctor blade technique without loosing efficiency.
72 citations
TL;DR: In this article, a large area photovoltaic devices based on an interpenetrating network of donor and acceptor molecules have been fabricated showing power conversion efficiencies up to 1.5% under monochromatic illumination at 500nm.
58 citations
TL;DR: In this article, the photovoltaic response of bulk donor-acceptor heterojunction between the conjugated polymer, poly(3-octylthiophene), P3OT, (as a donor, D) and fullerene (methanofullerene), (as acceptor, A), deposited between indium tin oxide and aluminum electrodes.
Abstract: (Received June 10, 1999; revised December 31, 1999) In this paper we present measurements of the photovoltaic response of bulk donor-acceptor heterojunction between the conjugated polymer, poly(3-octylthiophene), P3OT, (as a donor, D) and fullerene (methanofullerene), (as acceptor, A), deposited between indium tin oxide and aluminum electrodes. The innovation involves the substrate, which is a polymer foil instead of glass. These devices are based on ultrafast, reversible, metastable photoinduced electron transfer and charge separation. We also present the efficiency and stability studies on large area (6 cm x 6 cm) flexible plastic solar cells with monochromatic energy conversion efficiency (e) of about 1.5% and carrier collection efficiency of nearly 20%. Further more, we have investigated the surface network morphology of these films layers by atomic force microscope (AFM). The development of solar cells based on composites of organic conjugated semi-conducting polymers with fullerene derivatives can provide a new method in the exploitation of solar energy. Bull. Chem. Soc. Ethiop. 2000 , 14(1), 57-68 Bulletin of the Chemical Society of Ethiopia. ISSN: 1011-3924
9 citations
Journal Article•
TL;DR: In this paper, a large area photovoltaic device based on interpenetrating networks of donor and acceptor molecules has been fabricated by using the doctor blade technique, and it has been shown that upscaling to 10×15 cm is possible without loosing efficiency.
Abstract: Large area photovoltaic devices based on interpenetrating networks of donor and acceptor molecules have been fabricated by using the doctor blade technique. Devices containing blends of poly (para phenylenevinylene, PPV) derivatives as donor materials with various C60 derivatives as acceptors are compared. It is shown that among the various combinations of materials short circuit currents are maximal for blends of PPV and a highly soluble fullerene derivative (PCBM monoadduct), whereas the open circuit potentials stay almost the same for all devices. For the best combination of donor - acceptor materials it has been shown that upscaling to 10×15 cm is possible by using the doctor blade technique without loosing efficiency.
4 citations