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Sunday, 27 November 2016 13:19

AFM SEM Publications

Integrating electron and near-field optics: Dual vision for the nanoworld

N. M. Haegel

Nanophotonics 2014; 3(1-2): 75–89

Optical attenuation coefficient in individual ZnO nanowires

Little et al.

Opt Express. 2013 Mar 11;21(5):6321-6. doi: 10.1364/OE.21.006321.

Transport imaging with near-field scanning optical microscopy

Ang et al.

Article in Proceedings of SPIE - The International Society for Optical Engineering 7378 · May 2009

Imaging minority carrier diffusion in GaN nanowires using near field optical microscopy

Baird et al.

Physica B: Physics of Condensed Matter, Volume 404, Issue 23-24, p. 4933-4936. Dec 2009

 

 

"Characterization of the Photocurrents Generated by the Laser of Atomic Force Microscopes"

Review of Scientific Instruments 87(8), 083703.

Yanfeng Ji, Fei Hui, Yuanyuan Shi, Vanessa Iglesias, David Lewis, Jiebin Niu, Shibing Long, Ming Liu, Alexander Hofer, Werner Frammelsberger, Guenther Benstetter, Andrew Scheuermann, Paul C. McIntyre and Mario Lanza

 

Photoactive materials play a crucial role in the development of energy storage devices, such as solar, electrochemical cells, and others. Conductive atomic force microscopy (CAFM) is a powerful tool for nanoscale electronic characterization of photoactive materials. It is well known that environmental light can alter the measurements when scanning photoactive samples. For this reason, measuring in a dark environment has been recognized as the standard CAFM process. However, as an optical feedback laser is necessary to acquire topography, the laser used in CAFM can also generate a high photocurrent, even without any bias between the conductive tip and the sample. While the laser-induced current signal perturbation is well known within the CAFM community, the observation of currents generated by the optical feedback laser in absence of bias is still not fully understood and has never been studied in depth.

For the first time, this paper studies and analyzes the photocurrent induced in the photoactive materials by the feedback laser. CAFM measurements were carried out on photoactive samples using six standard optical feedback AFMs of different manufacturers, as well as a Nanonics tuning-fork based feedback AFM (without using a laser).

The results obtained show that the laser induces abundant parasitic photocurrent even without any bias in the other tested optical feedback AFMs. In contrast, the Nanonics MV4000 system based on Tuning Fork feedback does not induce parasitic photocurrent and thus provides a true current map in complete darkness.

3dcollage
3D Collage Map of topographic and current maps, collected on Ni electrode using the Nanonics MV4000 AFM without application of bias. The yellow regions were measured with illumination, in order to replicate a feedback laser, and high current is observed. In contrast, the blue regions were measured without any feedback laser, and thus in absolute darkness, and no current is observed.

 

Read the full abstract here 

Monday, 28 November 2016 11:27

Nanonics at MRS

 Visit Nanonics at MRS

Tuesday, 25 October 2016 08:09

NANONICS END OF THE YEAR SALE

Sale on NSOM Systems and Probes

Wednesday, 14 September 2016 07:40

Thermal Resistive Probes

 

Monday, 15 August 2016 15:22

Nanonics at NFO-14

Monday, 15 August 2016 15:16

Overview of Nanonics Products in Chinese

Sunday, 07 August 2016 13:07

Fluorescence NSOM

NSOM systems for plasmonics, photonics, and nano-optical studies

Sunday, 07 August 2016 11:37

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NSOM systems for plasmonics, photonics, and nano-optical studies

 

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