Application

THIN FILM CHARACTERIZATION

Thin films can be characterized from different aspects. The below listed applications can provide simple and clear information about the wide range of thin film classification.

  • Optical, electronic and energy applications: solar cell materials, thermochromic and electrochromic materials, nanocrystalline films. Thin films and doped layers. Study of temperature-dependent optical phase transitions.
  • Bio-ellipsometry: biosensor based on measuring the phase shift and Mueller matrix of monomolecular coatings. Anisotropic materials inspired by nature. Total internal reflection ellipsometry. Study of solid-liquid interfaces.
  • Real-time ellipsometry: measurement in situ during vacuum chamber deposition cycles.
  • Graphene and novel 2D and 3D materials. Characterization of plasmonic response of patterned surfaces. Specular, and oblique angle scatterometry.
  • High accuracy determination of optical functions (refractive index, absorption) versus wavelength.

 

Technology

SPECTROSCOPIC REFLECTOMETRY

 

Spectroscopic Reflectometry is a widely-used tool for thin film characterization. The measurement provides information on film layer thickness and optical properties. Spot size can be as small as 5 ┬Ám which allows us to measure inside the sub-pixel, consequently no separate test pad is needed for the measurement.

In Semilab SR metrology, wide range of wavelength and high intensity Xe-lamp is used, which makes possible to select the measurement wavelength range according to specific process requirements of the Customer. For thicker layers near-infrared extension can be added which allows to us measure up to several tens of micrometers. An UV-filter can also be added to protect the photoresist or other sensitive layers from UV-light. Due to the large light intensity, acquisition time can be reduced to several milliseconds. Fast focusing and precise movement can be performed due to the integrated laser optical displacement sensor and the 2D camera.

Spectroscopic Reflectometry and Ellipsometry both use the same analysis engine. Consequently, the same optical model can be used for the same material even if being measured by two different metrologies.

Organic layer thickness map

 

Measured and fitted reflectance curve on an organic layer

 

FEATURES

  • Selectable spot size
  • Fast acquisition time
  • Easy and straightforward way of optical modeling
  • Same optical model can be applied for ellipsometry, reflectometry and Imaging Spectroscopic Reflectometry
  • Large wavelength resolution

 

Product Line

SE-2000 with SR option

FPT- series are dedicated for flat panel testing and characterization. The products are designed to characterize LCD and AMOLED TFT panels up to GEN 8.5.  It is capable to combine several measurement probes into one platform, providing high precision measurements over the entire surface of flat panels with high accuracy and fast motorization stage and weight capacity.

Products