期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 15, 页码 8310-8318出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b01005
关键词
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资金
- Air Force Office of Scientific Research [FA9550-15-1-0061]
- U.S. Army Research Office [W911NF-12-1-0025]
- NSF Graduate Research Fellowship Program [DGE-1256259]
Semiconducting single-walled carbon nanotubes (s-SWCNTs) have attracted significant attention as a photo-active component in thin film photovoltaic solar cells and photodetectors due to their strong optical absorptivity and high charge transport mobility. However, the external quantum efficiency (QE) of s-SWCNT/acceptor heterojunction solar cells has been limited by poor exciton harvesting efficiency. Exciton trapping and quenching at defects are a suspected source of loss. Here, we study the influence of defects on bilayer s-SWCNT/C-60 planar heterojunction photovoltaic devices via both experiment and modeling. First, diazonium chemistry is used to introduce covalent sp(3) sidewall defects to s-SWCNTs at various densities that are estimated using Raman and transient absorption spectroscopy. s-SWCNT/C60 heterojunction photovoltaic cells are then fabricated that show a significant decrease in peak external QE (e.g., from 40% to 8%) with increasing defect density. Second, a diffusion-limited contact quenching Monte Carlo model is developed to assess the contributions of exciton quenching defects on exciton migration in bilayer s-SWCNT/C60 heterojunction devices. The model indicates that current state-of-the-art s-SWCNT-based devices are defect limited and suggests that significant gains in exciton harvesting efficiency can be realized if more pristine, longer s-SWCNTs are utilized.
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