Electrical Transport — Semiconducting Conjugated Coordination Polymer with High Charge Mobility Enabled by “4 + 2” Phenyl Ligands

5 measurement groups · 13 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

steady-state THz spectroscopy and optical-pump THz-probe spectroscopy

Terahertz spectroscopy

Cu3BHT thin film on fused silica/SiO2 substrate · Thin Film

Same THz/OPTP measurements as Cu4DHTTB film; used as metallic control.

Atmosphere: dry N2 for OPTP
Geometry: thin film on fused silica/SiO2
Context: pristine Cu3BHT control film
Measurement source: 2435 · Results and Discussion · Figure 4b,c

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu3BHT transient photoconductivity sign	negative Delta sigma upon photoexcitation	—	—	Text Qualitative	2435 · Results and Discussion · Figure 4c
Cu3BHT steady-state THz absorption	up to ~80% THz absorption	—	—	Text Approximate	2435 · Results and Discussion · Figure 4a,b

parallel four-probe direct-current electrical conductivity

Electrical conductivity

Cu4DHTTB pellet sample · Pellet

Pellet with four parallel gold electrodes, 500 um electrode width, 1 mm spacing, measured under high vacuum and dark environment with 100 mA current.

Temperature: 2-300
Atmosphere: high vacuum, dark
Geometry: 2 mm x 5 mm pressed pellet; four-electrode setup
Context: pristine polycrystalline Cu4DHTTB pellet
Measurement source: SI pp. 4-5 · Electrical property measurement · Figure 3b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Arrhenius activation energy	about 0.05 eV	—	—	Text Approximate	2434 · Results and Discussion · Figure 3b inset
room-temperature electrical conductivityMarked as a best value within this paper	~0.2 S cm-1 at room temperature	—	—	Text Approximate	2433 · Results and Discussion · Figure 3b
temperature coefficient of conductivity	positive temperature coefficient	—	—	Text Qualitative	2433 · Results and Discussion · Figure 3b

optical-pump THz-probe spectroscopy and Drude fitting

Terahertz spectroscopy

Cu4DHTTB thin film on fused silica/SiO2 substrate · Thin Film

800 nm, about 50 fs, 1 kHz laser pulses; dry N2; pump fluences 29-79 uJ/cm2 for dynamics and 318 uJ/cm2 for frequency-resolved Drude fits at 10, 100 and 1000 ps.

Atmosphere: dry N2
Geometry: thin film on fused silica/SiO2
Context: pristine Cu4DHTTB film
Measurement source: 2435-2436 · Results and Discussion · Figure 4d-f

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
charge carrier density/photoconductivity decay time	within ~2 ps	—	—	Text Approximate	2436 · Results and Discussion · Figure 4d
mobility relative to other conductive 3D CPs/MOFs	2-4 orders of magnitude higher	—	—	Text Qualitative	2436 · Results and Discussion · Table S1
Cu4DHTTB transient photoconductivity sign	positive Delta sigma upon photoexcitation	—	—	Text Qualitative	2435 · Results and Discussion · Figure 4d
Drude charge momentum scattering timeMarked as a best value within this paper	10 +/- 2 fs	—	+/- 2 fs	Text Exact Reported	2436 · Results and Discussion · Figure 4e,f
direct current charge mobility from THz Drude fitMarked as a best value within this paper	88 +/- 15 cm2 V-1 s-1	—	+/- 15 cm2 V-1 s-1	Text Exact Reported	2436 · Results and Discussion · Figure 4f; Table S1

temperature-dependent THz photoconductivity

Terahertz spectroscopy

Cu4DHTTB thin film on fused silica/SiO2 substrate · Thin Film

Temperature-dependent THz photoconductivity under vacuum pressure < 2 x 10-4 mbar with a cryostat.

Temperature: 78-288
Atmosphere: vacuum
Geometry: thin film on silicon/fused silica substrate
Context: pristine Cu4DHTTB film
Measurement source: SI p. 7 · Ultrafast THz spectroscopy · Figure S11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu4DHTTB film crystal domain size	below 100 nm	—	<	Text Approximate	2436 · Results and Discussion · Figure S12
maximum photoconductivity increase on cooling	slight increase (~20%) as temperature decreases from 288 to 178 K	—	~	Text Approximate	2436 · Results and Discussion · Figure S11

steady-state ultrafast THz spectroscopy, frequency-resolved complex THz conductivity

Terahertz spectroscopy Electrical conductivity

Cu4DHTTB thin film on fused silica/SiO2 substrate · Thin Film

THz waveforms through blank SiO2, Cu3BHT and Cu4DHTTB films recorded without photoexcitation; Fourier transformed to obtain sigma(omega).

Geometry: thin film on fused silica/SiO2
Context: pristine Cu4DHTTB film compared with Cu3BHT pristine control film
Measurement source: SI p. 6 · Ultrafast THz spectroscopy · Figure 4a,b

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cu4DHTTB steady-state THz absorption	negligible THz absorption	—	—	Text Qualitative	2435 · Results and Discussion · Figure 4a,b