Single-walled-carbon-nanotube (SWNT) films are prepared with high transparency, electrical conductivity, and uniformity, with exceptionally low surface roughness, on arbitrarily large substrates by ultrasonic spraying. This scalable process is ideally suited for large-area, solution-based production of SWNT electrodes for photovoltaics and other optoelectronic applications. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Ultrasmooth, Large‐Area, High‐Uniformity, Conductive Transparent Single‐Walled‐Carbon‐Nanotube Films for Photovoltaics Produced by Ultrasonic Spraying