Large photocurrent generation in multiwall carbon nanotubes

Abstract

The authors demonstrate the ability of multiwall carbon nanotubes to generate photocurrents in the near ultraviolet and visible spectral ranges using electrochemical photocurrent measurements. The photogenerated current depends on the excitation wavelength similar to that for single wall carbon nanotubes. Its intensity and modulation can be related to the carbon nanotubes morphology. The maximum photon-to-current conversion efficiency is approximately 7%, about 50 times higher than that reported for single wall carbon nanotubes. This result is of particular relevance for photovoltaic nanodevices and solar energy conversion applications. (c) 2006 American Institute of Physics

Photoresponse from noble metal nanoparticles-multi walled carbon nanotube composites

“…This can be ascribed to structural fluctuations in the CNT that influenced the optical response, as we have already reported. 18 A similar trend in the IPCE curves has been obtained from the MWCNT samples decorated with Ag and Cu, Figs. 2(b) and 3(c), respectively.…”

Photocurrent Response from Vertically Aligned Single-Walled Carbon Nanotube Arrays

“…Firstly there has been some evidence that carbon nanotubes can replace platinum as a catalyst because of their high surface area and electronic properties [6][7][8]. However, these SWCNTs are also of interest because they can also act as photosensitive elements themselves [9][10][11][12]. Light response of the cell is measured by measuring current-voltage response (I-V curves) under illumination.…”

3D Carbon Nanotube Networks as Mechanical, Electrical and Photovoltaic Transducer and Superhydrophobic Filter

“…A photoelectric conversion efficiency of about 6.2% has been achieved for the DSC with a CNT-sponge CE, compared with the 7.6% of that with Pt CEs. Recently, our research group showed that 2D films made of MWCNTs only can be used as optical active medium for light energy conversion in a solar cell device [16]. Similarly, we performed a similar measurement using a piece of CNT-sponge, which possesses a self-sustainable structure, as a working electrode in standard electrochemical cell.…”

“…Similarly, we performed a similar measurement using a piece of CNT-sponge, which possesses a self-sustainable structure, as a working electrode in standard electrochemical cell. The photo-response was measured as a function of the incident photon wavelength and expressed in terms of quantum efficiency (IPCE) [16], as reported in Figure 6. In the same figure the response obtained from a MWCNT film grown on a silicon substrate [16] is reported for comparison.…”

“…The photo-response was measured as a function of the incident photon wavelength and expressed in terms of quantum efficiency (IPCE) [16], as reported in Figure 6. In the same figure the response obtained from a MWCNT film grown on a silicon substrate [16] is reported for comparison. The samples show a photo-response in incident photon wavelength range studied with similar IPCE trend.…”