Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 86: Organic Electronics and Photovoltaics VI (DS jointly with CPP, HL, O)
O 86.7: Vortrag
Donnerstag, 3. April 2014, 19:15–19:30, CHE 91
Spray coating process for highly conductive silver nanowire networks as transparent top electrode for small molecule organic photovoltaics — •Franz Selzer1, Nelli Weiß2, David Kneppe1, Ludwig Bormann1, Christoph Sachse1, Nikolai Gaponik2, Lars Müller-Meskamp1, Alexander Eychmüller2, and Karl Leo1 — 1IAPP, TU Dresden — 2Phy. Chem., TU Dresden
Organic photovoltaics are a promising technology for fabrication in high throughput R2R-coating machines. Therefore, flexible and highly conducting transparent electrodes on temperature sensible polymer films are required. Percolative networks made of silver nanowires (AgNWs) are a flexible alternative, showing an opto-electrical performance comparable to ITO. Usually, they are deposited from solution, followed by post-annealing (200°C). The solvents involved in the deposition limit the versatility of this type of electrode and do not allow the direct deposition as top contact onto evaporated small molecule devices. Here, we present a novel spray-coated AgNW mesh, showing excellent opto-electrical performance although processed below 80°C. We investigate different types of wire functionalization and the consequences on typical network parameters of AgNWs. By comparing all investigated materials for different parameters like varying concentration and by scanning electron microscopy, the basics of the sheet resistance reduction mechanism are extracted and AgNW electrodes (<50Ohm/sq@>80%) are processed at 30°C. Finally, the successful implementation as transparent top electrode for high-performance organic p-i-n type solar cells is demonstrated.