It is very critical and important to measure ionization energy and work function of the organic semiconducontor meterials such as organic electronic luminescense and organic thin flim solar cells.
Generally,measurement of ionization energy/work function has been done by photoelectron spectroscopy such as UPS and XPS in which the samples have been measured only under high vacuum atmoshere. However, organic devices are affected by the atmosphere so that measurement under various atmaospheric gas have been demanded.
By employing Photoelectron Yield Spectroscopy(PYS),Model BIP-KV100 is capable to measure such samples under nitrogen atmosphere,vacuum atmosphere, and atmosphere. Using a nitrogen purge type monochromator and optical system. Model BIP-KV100 is capable to irradiate vacuum ultra violet light up to 9.54eV to the samples.
Catalog（PDF） Download
BIP-KV100 Ionization Energy Measurement System 〉
A4／2pages／1.08MB
Features
Measurement Data
Measurement Data
- Background measurement
The light to be irradiated on the sample is mesured in advance with a photomultiplier, and the number of photons is calculated. - Sample measurement
Monochromatic light at each wavelength is irradiated to the sample while the voltage is applied to the sample for the electrons to be released easily. - Ionization energy data processing
Y ∝ (hν-I)n
Y = Released numbers of electron measured / numbers of photon irradiated
h Plnck’s constant
ν Frequency
I Threshold
n depends on density of elecrtrons in the high level edge in the occupied state
of the sample.Only 2 or 3 can be selected in the parameter n.
Specifications
| Measurement principle | Photoelectron Yield Spectroscopy (PYS method) |
| Measurement WL range | 9.54～4.0eV（130～310nm） |
| Min.measurement interval | 0.01eV |
| Measurement resolution | 10fA～100mA |
| Sample chamber | Atmosphere, nitrogen, Vacuum compatible /VG65,NW25 port for vacuum pump |
| Irrdiation light area | approx. 1×3mm（by slit and vertical aperture） |
| WL reslution (WL width) | 0.08eV（4.2nm） *at256nm |
| Sample arranbement | Horizonal, Number of setting sample : 1pc |
| Sample size | Max.60×60mm, Min. 10×10mm, Thickness : within 4mm |
| Door switch | For safety of internal applied voltage electrode and for applied voltage for PMT |
| Monochromator structure | Nitrogen purge ( light source and high order light cut-filters built in ) |
| WL drive | Stepping motor, sine bar method (GPIB control) |
| Focal length | 100mm *for monochromator |
| Aperture ratio | F=3.5 *for monochromator |
| Mechancial WL range | 0～400nm *In case of the grating 2400 lines/mm |
| WL accuracy | ±1nm *Setting from long WL *WL accuracy & repeatabilty |
| Tubing introduction | IN2（Swagelok1/4 ）・OUT2（Swagelok3/8）・Relief valve, Flow meter,Stop valve |
| PY measuring device | Micro ammeter (Sub-Femtoamp Remote SourceMeter) *PY=Photoelectron Yield |
| Irrdiation intensity detector | PMT(supplied with certifled spectral sensitvity data for 130～310nm) |
| Software control function | System control,photoelectron measuring function,cal. of ionization eneygy(work function),DOS |
| Software save function | Data binary save and redisplay function,save in text |
Standard configurations
- Deuterium lamp 30W,(MgF2 Window,natural air cooling)
- Power supply for D2 lamp
- Nitrogen purge type monochromator
- Grating 2400 grooves/mm blazed at 150nm（MgF2 coating type）
- High order light cut filters and shutter
- Flow meter（1～10L/min）
- Sample chamber (atmosphere, nitrogen atmoshere,and vacuum compatible)
- Sample stage:62×62ｍｍ(PTFE,detachable)
- Sample stage slide mechanism (operated outside of sample chamver,travel distance 65mm)
- Plate electrode up-down mechanisum(travel distance 6ｍｍ)
- Standard sample（Gold leaf Au)
- PMT for measuring irrdiation light intensity and high voltage power supply （applied voltage -300V)
- Minute current measurement device for photoelectron yield measurement
– Minimun range：1pA Minimun range resolution：10aA（When the range is set at 1pA）
– Max.range：100mA Max.range resolution：1.0μA（When the range is set at 100ｍA）
– Noise level : Within 0.4fAp-ｐ（4×10-16Ａ noise） - Controller (GPIB control）
- GPIB-USB cable
- Softwave
- PC for controling the system Note PC
Option
- Measurement range expansion unit（for 3.4～7.5eV）
– Grating 2400grooves /mm blazed at 240nm（MgF2 coating type）
– PMT （for 3.4～7.5eV用） - Automatic sequencer （Vacuum drawing,vacuum leak, nitrogen purge）
- Vacuum pump （Multi steps root motor type dry vacuum pump/Turbo Molecular Pump）
Utility
- Nitrogen：
Regarding purity 99.999% or more is recommended
Introdutction pressure：0.1～0.4MPa
Ordinary use flow rate：Approx 3～5NL/min
Nitrogen IN fitting：Swegelok1/4 2places
Nitrogen OUT fitting：Swegelok3/8 2places - Main unit：
Approx.W660×Ｄ460×H500mm＊excluding the protrusion part
Approx. W710×D550×Ｈ600mm＊excluding the protrusion part - Welight ：Approx.80kg
