Capillary Printing of Highly Aligned Silver Nanowire Transparent Electrodes for High-Performance Optoelectronic Devices.

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Nano letters, ISSN: 1530-6992, Vol: 15, Issue: 12, Page: 7933-42

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Kang, Saewon, Kim, Taehyo, Cho, Seungse, Lee, Youngoh, Choe, Ayoung, Walker, Bright, Ko, Seo-Jin, Kim, Jin Young, Ko, Hyunhyub
American Chemical Society (ACS), AMER CHEMICAL SOC
Chemical Engineering, Chemistry, Materials Science, Physics and Astronomy, Engineering, Aligned silver nanowire, capillary printing, organic solar cells, polymer light emitting diode, transparent electrodes
article description
Percolation networks of silver nanowires (AgNWs) are commonly used as transparent conductive electrodes (TCEs) for a variety of optoelectronic applications, but there have been no attempts to precisely control the percolation networks of AgNWs that critically affect the performances of TCEs. Here, we introduce a capillary printing technique to precisely control the NW alignment and the percolation behavior of AgNW networks. Notably, partially aligned AgNW networks exhibit a greatly lower percolation threshold, which leads to the substantial improvement of optical transmittance (96.7%) at a similar sheet resistance (19.5 Ω sq(-1)) as compared to random AgNW networks (92.9%, 20 Ω sq(-1)). Polymer light-emitting diodes (PLEDs) using aligned AgNW electrodes show a 30% enhanced maximum luminance (33068 cd m(-2)) compared to that with random AgNWs and a high luminance efficiency (14.25 cd A(-1)), which is the highest value reported so far using indium-free transparent electrodes for fluorescent PLEDs. In addition, polymer solar cells (PSCs) using aligned AgNW electrodes exhibit a power conversion efficiency (PCE) of 8.57%, the highest value ever reported to date for PSCs using AgNW electrodes.

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