Primary studyCore evidenceThin Film Device

Facile interfacial charge transfer across hole doped cobalt-based MOFs/TiO2 nano-hybrids making MOFs light harvesting active layers in solar cells

Lee D.Y., Lim I., Shin C.Y. et al. · Journal of Materials Chemistry A · 2015 · 22669-22676

4materials
11samples
7synthesis routes
25measurements
59results
5claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

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: High

The iodine-treated Co-NDC/TiO2/FTO photoanode gives the best photovoltaic performance in the paper, with 2.56 mA cm^-2 Jsc and 1.12% power conversion efficiency.

Caveat: Device performance is application evidence for the doped MOF/TiO2 composite rather than a standalone framework conductivity metric.

p005 / article p.22673 · Results and discussion · Table 1 · Linked to 3 structured results

Composite RoleSupport assessment: High

Iodine-doped Co-MOF layers establish an electron-transport path from the MOF absorber to TiO2, as indicated by strong PL quenching and reduced EIS charge-transfer resistance.

Caveat: EIS fitted parameters are exact from SI Table S1; PL quenching is reported as an approximate percentage in the main text.

p005 / article p.22673 · Results and discussion · Fig. 5A · Linked to 6 structured results

Structure Property LinkSupport assessment: Medium

The Co-NDC framework confines more iodine than Co-BDC and correspondingly shows better conductivity/mobility, attributed to larger pore/unit-cell dimensions and naphthalene pi-electron interactions.

Caveat: The causal link is argued by the authors; pore dimensions are not numerically reported in the main article.

p004 / article p.22672 · Results and discussion · Fig. 3 · Linked to 5 structured results

Transport MechanismSupport assessment: Medium

The authors propose that upon illumination CoII d-d excitation is followed by metal-to-ligand charge transfer and electron injection into the TiO2 conduction band and then the external FTO circuit.

Caveat: Mechanism schematic is in SI Fig. S3; the mechanistic sequence is proposed by the authors rather than directly quantified.

p007 / article p.22675 · Results and discussion · Fig. S3 cited · Linked to 4 structured results

Transport MechanismSupport assessment: High

Iodine treatment oxidatively hole-dopes the Co-MOF frameworks, changing otherwise insulating films into p-type semiconducting films with measurable carrier concentration and high hole mobility.

Caveat: Two-probe conductivity values are figure-only; no absolute conductivity in S cm^-1 is reported in the main text.

p004 / article p.22672 · Results and discussion · Fig. 3B · Linked to 5 structured results

Material identities

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

MaterialCompositionStructure contextSource
cobalt(II) benzenedicarboxylate MOF (Co-BDC)Co-BDC; exact empirical formula not reportedCo2+ centres forming infinite chain networks · benzenedicarboxylic acid / terephthalic acid (BDC)3D · PristineMesoporous crystalline three-dimensional cobalt-based MOF; LBL film XRD matches bulk Co-BDC reference powder.p003 / article p.22671 · Results and discussion · Fig. 2
Co-BDC/TiO2 nano-hybrid photoanodeCo-BDC on mesoporous TiO2/FTOCo2+ centres in Co-BDC plus TiO2 semiconductor scaffold · benzenedicarboxylic acid / terephthalic acidunknown · CompositeComposite photoanode with Co-BDC deposited through mesoporous TiO2; XRD contains TiO2/FTO plus Co-BDC features.p005 / article p.22673 · Results and discussion · Fig. 4
cobalt(II) 2,6-naphthalenedicarboxylate MOF (Co-NDC)Co-NDC; exact empirical formula not reportedCo2+ centres forming infinite chain networks · 2,6-naphthalenedicarboxylic acid (2,6-NDC)3D · PristineMesoporous crystalline three-dimensional cobalt-based MOF; LBL film XRD matches bulk Co-NDC reference powder.p003 / article p.22671 · Results and discussion · Fig. 2
Co-NDC/TiO2 nano-hybrid photoanodeCo-NDC on mesoporous TiO2/FTOCo2+ centres in Co-NDC plus TiO2 semiconductor scaffold · 2,6-naphthalenedicarboxylic acidunknown · CompositeComposite photoanode with Co-NDC deposited through mesoporous TiO2; XRD contains TiO2/FTO plus Co-NDC features.p005 / article p.22673 · Results and discussion · Fig. 4

Sample register

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

Show 11 sample records
SampleForm and roleProcessing and geometrySource
Co-BDC bulk powder referenceresearch_0344__mat__mat_co_bdcPowder · Pristine Control · Pristine FrameworkSolvothermal powder; filtered, washed with DMF, and dried at 50 C for 3 h.p002 / article p.22670 · Experimental - Synthesis of bulk Co-MOFs
Iodine-treated Co-BDC LBL film on amine-functionalised glassresearch_0344__mat__mat_co_bdcThin Film · Target Sample · DopedLBL film treated in 0.1 M I2/acetonitrile for 2 h at 50 C, then washed with acetonitrile.amine-functionalised glass slidep004 / article p.22672 · Results and discussion · Fig. 3
Pristine Co-BDC LBL film on amine-functionalised glassresearch_0344__mat__mat_co_bdcThin Film · Pristine Control · Pristine FrameworkLayer-by-layer film before iodine treatment.amine-functionalised glass slidep003 / article p.22671 · Results and discussion · Fig. 1, Fig. 2, Fig. 3
Iodine-treated Co-BDC/TiO2/FTO photoanoderesearch_0344__mat__mat_co_bdc_tio2Electrode · Target Sample · DopedCo-BDC/TiO2/FTO treated with iodine to hole-dope the MOF framework.mesoporous TiO2 on HBL-coated FTO · about 17 um TiO2 scaffold; 20 LBL Co-BDC cyclesp005 / article p.22673 · Results and discussion · Table 1
Pristine Co-BDC/TiO2/FTO photoanoderesearch_0344__mat__mat_co_bdc_tio2Electrode · Pristine Control · CompositeCo-BDC grown on TiO2 modified FTO for 20 LBL cycles; no iodine treatment.mesoporous TiO2 on HBL-coated FTO · about 17 um TiO2 scaffold; 20 LBL Co-BDC cyclesp005 / article p.22673 · Results and discussion · Fig. 5 and Table 1
Co-NDC bulk powder referenceresearch_0344__mat__mat_co_ndcPowder · Pristine Control · Pristine FrameworkSolvothermal powder; filtered, washed with DMF, and dried at 50 C for 3 h.p002 / article p.22670 · Experimental - Synthesis of bulk Co-MOFs
Iodine-treated Co-NDC LBL film on amine-functionalised glassresearch_0344__mat__mat_co_ndcThin Film · Target Sample · DopedLBL film treated in 0.1 M I2/acetonitrile for 2 h at 50 C, then washed with acetonitrile.amine-functionalised glass slidep004 / article p.22672 · Results and discussion · Fig. 3
Pristine Co-NDC LBL film on amine-functionalised glassresearch_0344__mat__mat_co_ndcThin Film · Pristine Control · Pristine FrameworkLayer-by-layer film before iodine treatment.amine-functionalised glass slidep003 / article p.22671 · Results and discussion · Fig. 1, Fig. 2, Fig. 3
Iodine-treated Co-NDC/TiO2/FTO photoanoderesearch_0344__mat__mat_co_ndc_tio2Electrode · Target Sample · DopedCo-NDC/TiO2/FTO treated with iodine to hole-dope the MOF framework.mesoporous TiO2 on HBL-coated FTO · about 17 um TiO2 scaffold; 20 LBL Co-NDC cyclesp005 / article p.22673 · Results and discussion · Table 1
Pristine Co-NDC/TiO2/FTO photoanoderesearch_0344__mat__mat_co_ndc_tio2Electrode · Pristine Control · CompositeCo-NDC grown on TiO2 modified FTO for 20 LBL cycles; no iodine treatment.mesoporous TiO2 on HBL-coated FTO · about 17 um TiO2 scaffold; 20 LBL Co-NDC cyclesp005 / article p.22673 · Results and discussion · Fig. 5 and Table 1
Mesoporous TiO2/FTO photoanode substrateresearch_0344__mat__mat_co_bdc_tio2Electrode · Pristine Control · CompositeDoctor-bladed TiO2 nanoparticle paste on HBL-coated FTO, sintered at 450 C for 30 min.FTO glass with compact TiO2 hole-blocking layer · about 17 um mesoporous TiO2; about 60 nm TiO2 HBLp002 / article p.22670 · Experimental - Preparation, sensitization and doping of the TiO2 photoanode