Photoactive self-assembled monolayers for optically
switchable organic thin-film transistors
Michael Salinas, and Marcus Halika)
Organic Materials & Devices – Institute of Polymer Materials
University Erlangen-Nürnberg, Martensstraße 07, D-91058 Erlangen (Germany)
a)
Corresponding author
a)
Electronic mail: marcus.halik@ww.uni-erlangen.de
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TABLE I. Data for the SAM characterization: Water static contact angles (SCA) and
capacitances (Ci) measured at 100 kHz.
SAM
SCA [°]
Ci [µF/cm2]
1
111°
0.72
2
109°
0.82
3
73°
0.86
TABLE II. Transistor parameters determined for pentacene transistors under dark conditions and
under illumination with laser of 658 nm wavelength (in parentheses).
SAM
µsat
[cm2/Vs]
VTHa
[mV]
Vona
[mV]
Hysteresisa
[mV]
Vonb
[mV]
Hysteresisb
[mV]
1
0.054
-1490
-1150
10
-1150
40
(0.028)
(-460)
(150)
(905)
(-200)
(710)
0.039
-1425
-1150
5
-1150
40
(0.023)
(-420)
(150)
(730)
(400)
(760)
0.052
-640
-450
200
-400
515
(0.010)
(590)
(850)
(1065)
(1250)
(1300)
2
3
a
measured at VDS = -2 V, b measured at VDS = -0.1 V
2
TABLE III. Transistor parameters determined for DH6T transistors under dark conditions and
under illumination with laser of 658 nm wavelength (in parentheses).
SAM
µsat
[cm2/Vs]
VTHa
[mV]
Vona
[mV]
Hysteresisa
[mV]
Vonb
[mV]
Hysteresisb
[mV]
1
0.022
-425
-160
20
-160
25
(0.023)
(-450)
(-120)
(15)
(-160)
(10)
0.019
-440
160
20
40
55
(0.016)
(415)
(1160)
(335)
(840)
(495)
0.007
1500
1320
750
1840
960
(0.008)
(1520)
(1480)
(720)
(1880)
(775)
2
3
a
measured at VDS = -2 V, b measured at VDS = -0.1 V
3
FIG. S1. Transfer characteristics for pentacene ((a) – (c)) and DH6T ((d) – (f)) in the dark (solid
lines) and under illumination with λ = 658 nm and 10 mW/cm2 (dashed lines) in the linear
regime at VDS = -100 mV.
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FIG. S2. Transfer characteristics for pentacene ((a) – (c)) and DH6T ((d) – (f)) in the dark (solid
lines) and under illumination with λ = 406 nm and 10 mW/cm2 (dashed lines) in the saturation
regime at VDS = -2 V.
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FIG. S3. Output characteristics for pentacene ((a) – (c) with VGS from 0 V to -2.5 V) and DH6T
((d) – (f) with VGS from 0 V to -2 V) in the dark.
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FIG. S4. Effect of illumination with λ = 658 nm and 10 mW/cm2 in output characteristics at VGS
= 0 V for pentacene ((a) – (c)) and DH6T ((d) – (f)) samples.
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FIG. S5. Drain current as a function of time with illumination by 658 nm laser light at an
intensity of 30 mW/cm2 and switching behavior for pentacene on SAM 3 (black) and SAM 1
(green) and DH6T on SAM 2 (red ) at VDS = -2 V.
FIG. S6. Logarithmic plots of the drain current showing the slower increase after switching on
illumination with the 658 nm laser at 30 mW/cm2 for pentacene on SAM 3 (a) and DH6T on
SAM 2 (b).
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