Test Tools
Problems:
Electrical conductivity is an important characteristic of organic semiconductors. Unfortunately, the value of this key parameter for a given semi-conducting organic material varies widely from one report to another. Thetraditional four-point probe measurement method is no longer an effective way of evaluating the conductivity of an organic semiconducting film, because the contact resistance between the needle tips and the organic film is extremely high.
Solutions
We have acquired a patentedtechnology using a proprietary four-terminal chip (1M-4TC) as an effective and standardized tool for the conductivity measurement of organic semiconductors. Instead of 4-point contact in the traditional four-point probe, 1M-4TC provides 4-line contact between metallic probes and organic films, thus the contact resistance is reduced. More importantly, the nature of metallic lines (Au, Ag, Al, Ti, etc) can be selected and modified to have a proper work function align with the organic material to be examined. Furthermore, the dimension of each individual line and the geometry of the whole chip are thoroughly optimized to ensure the measurement accuracy and test reproducibility.
Table Experimental results of the samples tested
|
Sample
|
Thickness (nm)
|
R-film (W)
|
r (Wcm)
|
s (S/cm)
|
RC (W)
|
|
PEDOT
|
94
|
1.22 x 106
|
8.00 x 102
|
1.25 x 10-3
|
2.36 x 106
|
|
P3HT
|
100
|
4.56 x 109
|
3.19 x 106
|
3.13 x 10-7
|
5.89 x 109
|
|
MEH-PPV
|
100
|
3.77 x 1010
|
2.64 x 107
|
3.79 x 10-8
|
3.68 x 1010
|
|
Alq3
|
200
|
3.60 x 1010
|
5.04 x 107
|
1.98 x 10-8
|
6.34 x 1010
|
Strategy
The company has successfully fabricated these 4TC chips in laboratory scale and validated the performance of these chips through the third parties. We are now seeking manufacturing partners who can toll produce the patented chips and commercializing partners who can distribute and promote these chips globally. For more information, please contact the investment department of Chemscitech Inc at opportunity@1-material.com.
