1. Precision printing and optical modeling of ultrathin SWCNT/C60 heterojunction solar cells
- Author
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Matthew O. Reese, Kevin S. Mistry, A. D. Avery, Jonah Richard, Jeffrey L. Blackburn, Jao van de Lagemaat, Paul F. Ndione, Sarah Lucienne Guillot, and Anne-Marie Dowgiallo
- Subjects
Photocurrent ,Materials science ,business.industry ,Photovoltaics ,Photovoltaic system ,Surface roughness ,General Materials Science ,Heterojunction ,Nanotechnology ,Thin film ,Solar energy ,business ,Active layer - Abstract
Semiconducting single-walled carbon nanotubes (s-SWCNTs) are promising candidates as the active layer in photovoltaics (PV), particularly for niche applications where high infrared absorbance and/or semi-transparent solar cells are desirable. Most current fabrication strategies for SWCNT PV devices suffer from relatively high surface roughness and lack nanometer-scale deposition precision, both of which may hamper the reproducible production of ultrathin devices. Additionally, detailed optical models of SWCNT PV devices are lacking, due in part to a lack of well-defined optical constants for high-purity s-SWCNT thin films. Here, we present an optical model that accurately reconstructs the shape and magnitude of spectrally resolved external quantum efficiencies for ultrathin (7,5) s-SWCNT/C60 solar cells that are deposited by ultrasonic spraying. The ultrasonic spraying technique enables thickness tuning of the s-SWCNT layer with nanometer-scale precision, and consistently produces devices with low s-SWCNT film average surface roughness (Rq of
- Published
- 2015