Page 13 - Shimadzu UV-3600 Plus

Options Used for Measurements

Electrical, Electronics, and Optics Transportation Equipment

Band Gap Calculation LiDAR Collision Avoidance Sensor Evaluation System

Research into solar-cell and photocatalytic materials often involves the measurement of the band gap*, which is a basic LiDAR is a technology essential for self-driving vehicles. It measures the distance to and position of obstructions by scanning
physical property of the materials. Shown below are the diffuse reflectance spectra of three semiconductor materials used with laser light to measure the light reflected from obstructions. The results below were measured from the protective cover
in the production of solar cells using the ISR-603 integrating sphere. The absorption edge, the wavelength where the of a collision avoidance sensor as the incident light angle was varied. Considering that the transmittance level changes as
reflectance decreases, differs depending upon the sample type. This difference indicates a difference in the band gap of the the incident angle is varied, the results indicate that the laser wavelength used for the sensor should be near 960 nm,
samples. where transmittance does not decrease for the given cover material.
The band gaps of the samples were calculated using the Tauc method, and were determined to be 1.63ev for CuGaSe2
Example of Cover Sample
(red line), 1.27 eV for Culn0.5Ga0.5Se2 (blue line) and 0.99 eV for CuInSe2 (black line). 100
Field of view where
* The band gap refers to the energy difference between the top of the valence band filled with electrons and the bottom of the conduction band devoid Transmittance at 35-degree angle of incidence performance must
80 Transmittance at 45-degree angle of incidence be ensured
Collision Avoidance Sensor
of electrons. The wavelength range of the UV-3600i Plus is extremely effective for band gap calculations. 60 Transmittance at 55-degree angle of incidence Collision A voidance Sensor
Transmittance(%)
300 40 Sensor Cover
Sensor Cover
250 20
(hν(R∞)) 2 200 This hν value is the 0 900 940 nm 980 1020
150
100
50 band gap value.
0
0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Chemicals

hν (eV)
Materials Band Gap Value Haze Measurement of Plastics
CuGaSe2 1.63 eV (757 nm)
Because plastics are widely used now, clear plastic materials, such as lenses, are required. Haze value is one kind of
Culn0.5Ga0.5Se2 1.27 eV (977 nm)
evaluation of transmittance for plastics. Haze value is calculated by determining the ratio of total transmittance and defuse
CuInSe2 0.99 eV (1253 nm)
reflectance. A smaller haze value indicates a clearer material. The ISR-1503 with an of 150 mmø can mount a transmittance
sample horizontally. Shown here is a measurement result of a misty plastic plate. Spectra were ones of total transmittance
and defuse reflectance. Haze value was 32.9.
Construction ISR-1503 with an of 150 mmø is suitable for Haze measurement.

Measuring the Transmittance (Solar Transmittance) of Window Glass
In recent years, measures to offset the effects of global warming and heat islands have included the incorporation of Haze Value (%) =32.9
various kinds of functional glass into modern building materials. These new glass materials reduce the transmittance of
infrared radiation and also offer thermal insulation potential. Solar transmittance is defined by JIS as an index that Calculated by Total transmittance and
represents the transmission characteristics of sunlight, from visible to near-infrared light. The figure below shows spectral Diffuse reflectance.
data of transparent glass and suncut glass, and solar transmissivity/reflectance calculation results. It reveals that solar Note
transmittance varies depending on the type of glass. Obtained Haze value may differ from values obtained with
dedicated Haze meters.
This method of measuring solar transmittance requires a 250 to 2100 nm measurement range and an integrating sphere.
The combination of the UV-3600i Plus and ISR-603 is ideal for solar transmittance measurements.
Solar Radiation Calculation Software
Options Used for Measurements
This software calculates solar transmittance/reflectance from measured spectra.
ISR-603 Integrating Sphere The main calculation items are visible light transmittance/reflectance,
Attachment total light transmittance/reflectance, near infrared reflectance,
ultraviolet transmittance, CIE damage factor, and skin damage factor.
The related items of JIS, ISO and GB/T can be calculated.
Others
MPC-603A Multi-Purpose Large-Sample Compartment
Variable Angle Measurement Unit for MPC-603A
Excel macro program for band gap
®
Color Calculation Software

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