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Less severe processing improves carbon nanotube photovoltaic performance

Author:
Shea, Matthew J.  Wang, Jialiang  Flach, Jessica T.  Zanni, Martin T.  Arnold, Michael S.  


Journal:
APL MATERIALS


Issue Date:
2018


Abstract(summary):

Thin film semiconducting single walled carbon nanotube (s-SWCNT) photovoltaics suffer losses due to trapping and quenching of excitons by defects induced when dispersing s-SWCNTs into solution. We study these aspects by preparing photovoltaic devices from (6,5) carbon nanotubes isolated by different processes: extended ultrasonication, brief ultrasonication, and shear force mixing. Peak quantum efficiency increases from 28% to 38% to 49% as the processing harshness decreases and is attributed to both increasing s-SWCNT length and reducing sidewall defects. Fill-factor and open-circuit voltage also improve with shear force mixing, highlighting the importance of obtaining long, defect-free s-SWCNTs for efficient photoconversion devices. (C) 2018 Author(s).


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