Primary studyCore evidenceThin Film Device

Photoinduced Charge-Carrier Generation in Epitaxial MOF Thin Films: High Efficiency as a Result of an Indirect Electronic Band Gap?

Liu J., Zhou W., Liu J. et al. · Angewandte Chemie - International Edition · 2015 · 7441-7445

6materials
23samples
2synthesis routes
29measurements
104results
8claims and caveats

Evidence map

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Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Application RelevanceSupport assessment: Medium

FTO-supported free-base and Pd Zn-SURMOF 2 films retain nearly steady 530 nm photocurrent over 1800 s under 0.06 V bias in the reported photoelectrochemical durability tests.

Caveat: Visual estimates from Figures S33-S34; durability was tested once over 1800 s under the reported conditions.

43-44 / p044-p045 · Supplementary Figures · Figures S33-S34 · Linked to 8 structured results

Application RelevanceSupport assessment: Medium

QCM-D shows rapid acetonitrile and I-/I3- uptake and small dissipation changes, supporting electrolyte accessibility and rigidity/stability of the films.

Caveat: No BET or gas sorption porosity data are reported; QCM-D supports liquid permeation/stability rather than absolute pore volume.

29-31 / p030-p032 · Supplementary Figures · Figures S19-S21 · Linked to 6 structured results

Phase AssignmentSupport assessment: High

The spray LPE process yields highly oriented, well-ordered crystalline porphyrin Zn-SURMOF 2 thin films.

Caveat: Crystallinity for Pd is represented primarily by qualitative XRD orientation captions rather than full indexed peak tables.

7442 / p002 · Main text · Figure 2 · Linked to 3 structured results

Phase AssignmentSupport assessment: High

IR spectra support formation of zinc paddle-wheel structures with bidentate bridging carboxylate coordination.

Caveat: IR assignment is inferential and based on COO- splitting and loss of free COOH C=O features.

20-21 / p021-p022 · Supplementary Figures · Figures S11-S12 · Linked to 2 structured results

Structure Property LinkSupport assessment: High

Adding Pd into the porphyrin centre more than doubles the photovoltaic efficiency relative to the free-base Zn-SURMOF 2 device.

Caveat: Device uses liquid electrolyte and no mask; these details are reported in SI.

7443 / p003 · Main text · Figure 3 · Linked to 4 structured results

Structure Property LinkSupport assessment: Medium

The wavelength-dependent photocurrents of both free-base and Pd Zn-SURMOF 2/FTO follow the porphyrin chromophore absorption, with a photocurrent action maximum shifted to about 400 nm by solvatochromatic effects.

Caveat: Action-spectrum values are approximate figure-axis readings, and Figure S32 has the already-audited red/blue colour-assignment inconsistency.

40-42 / p041-p043 · Supplementary Figures · Figures S30-S32 · Linked to 3 structured results

Transport MechanismSupport assessment: High

FP-TRMC/TAS indicates unusually high photocarrier generation efficiency and appreciable local hole mobility in the porphyrin Zn-SURMOF 2 films.

Caveat: Mobilities are local-scale values inferred by correlated FP-TRMC/TAS kinetics, not direct DC transport mobilities.

7443 / p003 · Main text · Figures S26-S28 · Linked to 4 structured results

Transport MechanismSupport assessment: Medium

The authors link high OPV performance to computed indirect band gaps in ordered porphyrin Zn-SURMOF 2 semiconductors, which suppress recombination after relaxation.

Caveat: The mechanistic link is a proposed interpretation from computation and device behaviour; direct exciton diffusion length calculation is stated to be beyond the work.

7444 / p004 · Main text · Figure 5 · Linked to 4 structured results

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
Bare fluorine-doped tin oxide substrate controlF:SnO2unknown · UnknownConductive transparent oxide substrate used as bottom electrode and electrochemical control.6 / p007 · 1.5 Photoelectrochemical measurements
Free-base porphyrin Zn-SURMOF 2Not specifiedZn paddle-wheel units from zinc acetate · 5,15-diphenyl-10,20-di(4-carboxyphenyl)porphyrin (free-base porphyrin)3D · PristineSURMOF 2 paddle-wheel framework with P4 symmetry, parallel 1-D channels, layers perpendicular to substrates and [001] out-of-plane orientation.7442 / p002 · Main text · Figure 2
Free-base carboxyphenyl porphyrin linker controlNot specified[] · ['5,15-diphenyl-10,20-di(4-carboxyphenyl)porphyrin']0D · Model System18 / p019; 24 / p025 · Supplementary Figures · Figures S9 and S15
Pd porphyrin linker controlNot specified['Pd(II) metalloporphyrin centre'] · ['Pd(II) 5,15-diphenyl-10,20-di(4-carboxyphenyl)porphyrin']0D · Model System19 / p020 · Supplementary Figures · Figure S10
Pd porphyrin Zn-SURMOF 2Not specifiedZn paddle-wheel units from zinc acetate; Pd(II) in porphyrin macrocycle · Pd(II) 5,15-diphenyl-10,20-di(4-carboxyphenyl)porphyrin3D · PristineSURMOF 2 paddle-wheel framework with P4 symmetry, parallel 1-D channels, layers perpendicular to substrates and [001] out-of-plane orientation.13 / p014 · Supplementary Figures · Figure S4
Zn porphyrin Zn-SURMOF 2 computational modelNot specifiedZn paddle-wheel units and Zn metalloporphyrin centres · Zn-metallated porphyrin dicarboxylate linker model3D · Model SystemPeriodic SURMOF 2 electronic-structure model.7444 / p004 · Main text

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 23 sample records
SampleForm and roleProcessing and geometrySource
Bare FTO substrateresearch_0200__mat__bare_fto_controlElectrode · Pristine Control · UnknownBare FTO used as electrochemical and photocurrent control.FTO glass34 / p035 · Supplementary Figures · Figure S24
Free-base porphyrin Zn-SURMOF 2/FTO, 300 nmresearch_0200__mat__fb_zn_surmof2Electrode · Target Sample · Pristine FrameworkAs-grown film on FTO used for XRD, SEM, UV-Vis, photoelectrochemistry and device fabrication.FTO glass · 300 nm; 30 deposition cycles14 / p015 · Supplementary Figures · Figure S5
Free-base porphyrin Zn-SURMOF 2/FTO thickness series (100 and 300 nm)research_0200__mat__fb_zn_surmof2Electrode · Target Sample · Pristine FrameworkAs-grown thickness series used for photoelectrochemical action, on-off, and durability measurements.FTO glass · 100 nm and 300 nm35 / p036 · Supplementary Figures · Figure S25
Free-base porphyrin Zn-SURMOF 2 thin films on various substratesresearch_0200__mat__fb_zn_surmof2Thin Film · Target Sample · Pristine FrameworkAs-deposited spray LPE SURMOF film at room temperature.FTO glass, quartz glass, soda-lime glass, glass-coated QCM sensor, MHDA/Au, or Si depending on measurement · about 10 nm per deposition cycle; commonly 300 nm for 30 cycles; 1 um for FP-TRMC/TAS3 / p004 · 1.2 Preparation
Free-base porphyrin Zn-SURMOF 2 on Si substrate, 30-cycle spray filmresearch_0200__mat__fb_zn_surmof2Thin Film · Target Sample · Pristine Framework30 spray cycles; characterised by cross-section SEM and AFM.Si substrate · ~300 nm45 / p046 · Supplementary Figures · Figure S35
Free-base porphyrin Zn-SURMOF 2 on MHDA/Auresearch_0200__mat__fb_zn_surmof2Thin Film · Target Sample · Pristine FrameworkFilm grown on carboxyl-terminated MHDA/Au for IRRAS and XPS.16-mercaptohexadecanoic acid SAM on Au2 / p003 · 1.1 Preparation of substrates
Free-base porphyrin ethanol solution controlresearch_0200__mat__free_base_porphyrin_linker_controlUnknown · Pristine Control · Unknown20 uM free-base porphyrin in ethanol.none18 / p019; 24 / p025 · Supplementary Figures · Figures S9 and S15
Free-base porphyrin Zn-SURMOF 2 photovoltaic cellresearch_0200__mat__fb_zn_surmof2Electrode · Target Sample · CompositeSandwich photovoltaic device with I-/I3- acetonitrile electrolyte and 20 um hot-melt spacer.FTO glass photoelectrode with Pt-coated FTO counter electrode · about 300 nm; active area 0.25 cm27 / p008 · 1.6.1 Assembly of photovoltaic devices
Free-base porphyrin Zn-SURMOF 2 on glass-coated QCM sensorresearch_0200__mat__fb_zn_surmof2Thin Film · Target Sample · Pristine FrameworkAs-grown film exposed to acetonitrile and I-/I3- electrolyte in QCM-D.glass-coated QCM-D sensor29 / p030 · Supplementary Figures · Figure S19
Free-base porphyrin Zn-SURMOF 2 on quartz glassresearch_0200__mat__fb_zn_surmof2Thin Film · Target Sample · Pristine FrameworkFilm used for UV-Vis, transient absorption, and fluorescence measurements.quartz glass2 / p003 · 1.1 Preparation of substrates
Free-base porphyrin Zn-SURMOF 2 computational modelresearch_0200__mat__fb_zn_surmof2Model · Model System · ModelPeriodic framework and hydrogenated porphyrin electronic-structure calculations.8-9 / p009-p010 · 1.8 Computational studies
Free-base porphyrin Zn-SURMOF 2, 1 um FP-TRMC/TAS filmresearch_0200__mat__fb_zn_surmof2Thin Film · Target Sample · Pristine FrameworkIdentical film sample used for FP-TRMC and TAS.not specified · 1 um8 / p009 · 1.7 Evaluation of charge carrier mobility and carrier generation efficiency
Pd porphyrin Zn-SURMOF 2/FTO, 300 nmresearch_0200__mat__pd_zn_surmof2Electrode · Target Sample · Pristine FrameworkAs-grown film on FTO used for XRD, SEM, photoelectrochemistry and device fabrication.FTO glass · 300 nm; 30 deposition cycles14 / p015 · Supplementary Figures · Figure S5
Pd porphyrin Zn-SURMOF 2/FTO thickness series (100 and 300 nm)research_0200__mat__pd_zn_surmof2Electrode · Target Sample · Pristine FrameworkAs-grown thickness series used for photoelectrochemical action, on-off, and durability measurements.FTO glass · 100 nm and 300 nm35 / p036 · Supplementary Figures · Figure S25
Pd porphyrin Zn-SURMOF 2 thin films on various substratesresearch_0200__mat__pd_zn_surmof2Thin Film · Target Sample · Pristine FrameworkAs-deposited spray LPE SURMOF film at room temperature.FTO glass, quartz glass, soda-lime glass, glass-coated QCM sensor, or MHDA/Au depending on measurement · about 10 nm per deposition cycle; commonly 300 nm for 30 cycles; 1 um for FP-TRMC/TAS14 / p015 · Supplementary Figures · Figure S5
Pd porphyrin Zn-SURMOF 2 on MHDA/Auresearch_0200__mat__pd_zn_surmof2Thin Film · Target Sample · Pristine FrameworkFilm grown on carboxyl-terminated MHDA/Au for IRRAS and XPS.16-mercaptohexadecanoic acid SAM on Au17 / p018 · Supplementary Figures · Figure S8
Pd porphyrin ethanol solution controlresearch_0200__mat__pd_porphyrin_linker_controlUnknown · Pristine Control · Unknown20 uM Pd porphyrin in ethanol.none19 / p020 · Supplementary Figures · Figure S10
Pd porphyrin Zn-SURMOF 2 photovoltaic cellresearch_0200__mat__pd_zn_surmof2Electrode · Target Sample · CompositeSandwich photovoltaic device with I-/I3- acetonitrile electrolyte and 20 um hot-melt spacer.FTO glass photoelectrode with Pt-coated FTO counter electrode · about 300 nm; active area 0.25 cm27 / p008 · 1.6.1 Assembly of photovoltaic devices
Pd porphyrin Zn-SURMOF 2 on glass-coated QCM sensorresearch_0200__mat__pd_zn_surmof2Thin Film · Target Sample · Pristine FrameworkAs-grown film exposed to acetonitrile and I-/I3- electrolyte in QCM-D.glass-coated QCM-D sensor31 / p032 · Supplementary Figures · Figure S21
Pd porphyrin Zn-SURMOF 2 on quartz glassresearch_0200__mat__pd_zn_surmof2Thin Film · Target Sample · Pristine FrameworkFilm used for UV-Vis and fluorescence measurements.quartz glass19 / p020 · Supplementary Figures · Figure S10
Pd porphyrin Zn-SURMOF 2 computational modelresearch_0200__mat__pd_zn_surmof2Model · Model System · ModelPeriodic GGA-DFT band-structure model.7444 / p004 · Main text · Figure 5
Pd porphyrin Zn-SURMOF 2, 1 um FP-TRMC/TAS filmresearch_0200__mat__pd_zn_surmof2Thin Film · Target Sample · Pristine FrameworkIdentical film sample used for FP-TRMC and TAS.not specified · 1 um8 / p009 · 1.7 Evaluation of charge carrier mobility and carrier generation efficiency
Zn porphyrin Zn-SURMOF 2 computational modelresearch_0200__mat__zn_porphyrin_zn_surmof2_modelModel · Model System · ModelPeriodic electronic-structure model used for band-gap comparison.7444 / p004 · Main text