Direct and Dry Deposited Single-Walled Carbon Nanotube Films Doped with MoO_x as Electron-Blocking Transparent Electrodes for Flexible Organic Solar Cells

Abstract

PSS. The single-walled carbon nanotube organic solar cell in this work shows a power conversion efficiency of 6.04%. This value is 83% of the leading ITO-based device performance (7.48%). Flexible application shows 3.91% efficiency and is capable of withstanding a severe cyclic flex test.

Indium Tin Oxide-Free Small Molecule Organic Solar Cells Using Single-Walled Carbon Nanotube Electrodes

“…Anaerobic thermal doping of MoO 3 next to SWNTs was found to be a stable and effective doping method. 6,26 SWNT films were prepared by direct and dry deposition of SWNTs grown by the floating catalyst, i.e., aerosol chemical vapor deposition technique and deposited on a nitrocellulose membrane. 25 For this study, we produced SWNT films of 60% transparency at 550 nm and transferred them onto bare glass substrates.…”

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We demonstrated single-walled carbon nanotubes (SWNTs) electrode-based small molecule organic solar cells (OSCs) using diketopyrrolopyrrole donor, DPP(TBFu) 2 as an electron donor with [6,6]-phenyl-C61-butyric acid methyl ester (PC 61 BM) as an electron acceptor. SWNT films with 60% transmittance (at 550 nm) were dry-transferred onto glass substrates to replace conventional indium tin oxide (ITO) electrodes.

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“…We have already reported SWNT-based OSCs using low band-gap polymers as the electron donor, and produced a high PCE similar to that of the ITO reference devices. 6 In this work, we used small molecules as the electron donor to test their viability in SWNT-based OSCs. Solution-processed small molecule bulk heterojunction (BHJ) devices demonstrate similar efficiencies to their polymer-based counterparts.…”

MoOx Doped Single-Walled Carbon Nanotube Films as Hole Transport Layer for Organic Solar Cells

“…Hydrophilic nature of hydroxyl groups on MoO x and the solution coating method, allow PEDOT:PSS to fill up the pinholes effectively. Furthermore, the acidic PEDOT:PSS can also function as a weak additional dopant [6]. I − V characteristics of photovoltaic devices using SWCNT/MoO x bilayer as HTLs are depicted in Fig.…”

“…have been intensively researched. However only few studies can be found on the molybdenum oxide doping method [5,6]. Therefore, p-type doping effect of molybdenum oxide on the electronic structure of carbon nanotubes is not clear and needs to be investigated.…”