Organic Semiconductor Materials & Energy-Level Database
- Donors
- Acceptors
- Electrodes
- Dielectrics
- Sources
- Methods
Interactive Junction DesignEdit device architecture, layer order, electrodes, organic semiconductors, thickness and display colours.
Energy-Level AnalysisVisualize HOMO, LUMO, Fermi levels, metal work functions, offsets and simplified injection barriers.
Publication-Quality ExportGenerate editable SVG figures and high-resolution PNG images for teaching, reports and presentations.
FREE COMMUNITY EDITION
Guided Learning Path
Follow this sequence to move from organic-semiconductor fundamentals to a complete device schematic and energy-level diagram.
Learning outcome: By completing the path, the user should be able to identify a device family, explain every layer, construct its stack, interpret its energy-level diagram and justify material choices.
Learning Objectives
ExplainDescribe vacuum level, work function, ionization energy, electron affinity, HOMO, LUMO and Fermi level.
ConstructBuild representative organic Schottky, p–n, donor–acceptor, organic–inorganic, MIS, MIM and MSM structures.
EvaluateCompare HOMO/LUMO offsets and idealized carrier-injection barriers at adjacent interfaces.
InterpretIdentify likely ohmic, rectifying, blocking and selective contacts under simplified assumptions.
CustomizeEdit layer role, thickness, work function, HOMO, LUMO, semiconductor type and colour.
CommunicateExport editable SVG and high-resolution PNG figures.
Introduction
Organic semiconductor devices use molecular or polymeric materials whose electronic properties are commonly described using the highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), ionization energy, electron affinity, work function, energetic disorder and charge-carrier mobility.
This Community Edition focuses on device structures that can be represented using electrodes, organic semiconductors, interfacial layers and junctions. It supports simplified visualization of organic Schottky diodes, organic p–n junctions, donor–acceptor heterojunctions, organic–inorganic junctions, metal–semiconductor–metal devices, metal–insulator–semiconductor structures and metal–insulator–metal stacks.
Schottky Junctions
A rectifying metal–organic semiconductor contact produced by asymmetric electrode work functions and carrier-injection barriers.
Organic Heterojunctions
Interfaces between two organic semiconductors, often donor and acceptor materials, with different HOMO and LUMO energies.
Hybrid Junctions
Interfaces between organic and inorganic semiconductors or metal oxides used in diodes, detectors, sensors and hybrid electronic devices.
Device Families Learning Studio
Select a device family to learn its structure, working principle, carrier flow, applications, advantages and limitations before opening its builder template.
Organic Schottky Diode
One organic semiconductor between dissimilar metal contacts.
Organic p–n Junction
Interface between p-type and n-type organic semiconductors.
Donor–Acceptor Heterojunction
Energy-offset junction used for exciton dissociation and charge separation.
Organic–Inorganic Junction
Hybrid interface combining molecular and inorganic semiconductors.
MSM Device
Two metal–semiconductor contacts connected through one active layer.
MIS Structure
Metal–insulator–semiconductor stack for capacitive and interface studies.
MIM Structure
Insulating or switching layer between two metal electrodes.
Organic Sensor Stack
Functional organic layer whose conductivity or barrier changes after exposure.
Select a device family.
The toolkit will explain what it is, how it works, what the user should observe and which template to load.
The toolkit will explain what it is, how it works, what the user should observe and which template to load.
Layer-by-Layer Learning
A device structure is not simply a list of materials. Each layer performs a specific electrical, optical, chemical or mechanical function.
Electrode
Provides electrical connection to the external circuit.
- Key property: work function
- Controls carrier injection or extraction
- Examples: ITO, Au, Ag, Al
Hole-Transport Layer
Supports hole transport and may block electrons.
- HOMO alignment is important
- Can reduce contact resistance
- Examples: PEDOT:PSS, NPB
Electron-Transport Layer
Supports electron transport and may block holes.
- LUMO or conduction-band alignment matters
- Can improve selectivity
- Examples: PCBM, ZnO
Donor Semiconductor
Typically absorbs light or supports hole transport.
- HOMO controls oxidation and hole extraction
- LUMO participates in electron transfer
- Examples: P3HT, PM6
Acceptor Semiconductor
Accepts electrons from a donor or supports electron transport.
- LUMO offset drives electron transfer
- Morphology affects charge separation
- Examples: PCBM, Y6
Insulator / Interlayer
Controls field distribution, tunnelling, blocking or interface chemistry.
- Thickness can be critical
- May create an interface dipole
- Examples: PMMA, LiF, MoO₃
Learning task: After loading any device template, explain the purpose of every layer before changing its material or thickness.
Theory and Scientific Background
1. Vacuum-referenced molecular energy scale
The toolkit places the vacuum level at 0 eV. HOMO, LUMO and metal Fermi levels are displayed as negative energies below vacuum.
Ionization energy, IE = −EHOMO Electron affinity, EA ≈ −ELUMO
2. Metal work function and Fermi level
EF,metal = −Φmetal
The metal work function determines the position of the electrode Fermi level in the isolated-material diagram. Real metal/organic interfaces may show interface dipoles, chemical reactions, induced density of interface states and Fermi-level pinning.
3. Idealized carrier-injection barriers
Hole barrier: ΦBh ≈ IE − Φm Electron barrier: ΦBe ≈ Φm − EA
The Community Edition reports non-negative idealized barriers using vacuum-level alignment. These values are preliminary estimates and do not replace interface-specific measurements.
4. Organic heterojunction offsets
ΔELUMO = ELUMO,2 − ELUMO,1 ΔEHOMO = EHOMO,2 − EHOMO,1
Offsets help describe Type-I, Type-II and Type-III alignments, but charge separation and transport also depend on morphology, exciton binding, dielectric screening, disorder, traps and interfacial electronic coupling.
5. Before-contact and after-contact diagrams
This Community Edition primarily displays isolated or vacuum-aligned material levels. The optional equilibrium alignment applies a schematic common-Fermi-level adjustment for teaching and should not be interpreted as a self-consistent Poisson or drift–diffusion solution.
Model limitation: This toolkit does not solve Poisson, continuity, tunnelling, thermionic-field-emission, Gaussian density-of-states, image-force lowering, exciton transport or electrochemical equations. Values are representative starting points and should be replaced with experimentally measured or literature-validated values for scholarly work.
Representative Organic Electronics Materials Database
Values are representative and may vary with molecular weight, doping, substrate, morphology, surface treatment and measurement method.
| Material | Role | Type | Typical t (nm) | WF (eV) | HOMO (eV) | LUMO (eV) |
|---|---|---|---|---|---|---|
| ITO | Transparent electrode | Conductor | 150 | 4.70 | — | — |
| Au | Metal electrode | Conductor | 80 | 5.10 | — | — |
| Ag | Metal electrode | Conductor | 100 | 4.70 | — | — |
| Al | Metal electrode | Conductor | 100 | 4.30 | — | — |
| PEDOT:PSS | Hole-injection / p-type layer | p-type | 40 | 5.00 | −5.00 | −2.20 |
| P3HT | Donor / p-type semiconductor | p-type | 100 | 4.70 | −5.00 | −3.00 |
| PM6 | Donor semiconductor | p-type | 100 | 4.70 | −5.50 | −3.60 |
| PCBM | Acceptor / n-type semiconductor | n-type | 80 | 4.00 | −6.10 | −4.00 |
| Y6 | Non-fullerene acceptor | n-type | 100 | 4.20 | −5.70 | −4.10 |
| Alq3 | Electron-transport organic | n-type | 50 | 4.10 | −5.80 | −3.00 |
| ZnO | Inorganic n-type semiconductor | n-type | 40 | 4.40 | −7.60 | −4.30 |
| Si | Inorganic semiconductor | p/n-type | 500000 | 4.60 | −5.17 | −4.05 |
| PMMA | Insulator | Dielectric | 100 | 0.00 | −7.80 | −1.80 |
Worked Examples
Example 1
Au / P3HT Schottky Contact
Given: Au work function ≈ 5.10 eV and P3HT HOMO ≈ −5.00 eV.
Reasoning: The idealized hole barrier is small, so Au is generally favorable for hole injection into P3HT.
Learn: A high-work-function electrode can improve hole injection.
Example 2
P3HT / PCBM Heterojunction
Given: PCBM has a lower LUMO than P3HT.
Reasoning: An excited electron in P3HT can transfer toward PCBM while the hole remains mainly in P3HT.
Learn: Type-II-like offsets can support charge separation.
Example 3
Al / Organic Electron Contact
Given: Al has a lower work function than Au.
Reasoning: It may reduce the electron-injection barrier for suitable organic LUMO energies but can be chemically reactive.
Learn: Energy alignment and interface stability must both be considered.
Device Templates
Layer order is from bottom/substrate side to top contact. Drag rows to reorder.
Layer Stack Editor
| Role | Material | t nm | WF | HOMO | LUMO | Type | Color |
|---|
Figure Settings
Calculated Metrics
AI-Style Interpretation
Research-Quality Device Structure
Vacuum-Referenced Energy-Level Diagram
Practice Problems
Beginner
Identify the Layer
In ITO / PEDOT:PSS / P3HT / PCBM / Al, which layer primarily supports hole collection at the ITO side?
Intermediate
Compare Contacts
Which is likely to provide a lower idealized hole barrier to P3HT: Au or Al? Explain using work function.
Advanced
Design a Selective Junction
Choose layers that support hole extraction at one side and electron extraction at the other while limiting opposite-carrier leakage.
Select “Show Hint” for guidance.
Knowledge Quiz
Question 1 of 5
What does the HOMO level most directly help explain?
Choose an answer. Explanations are provided after each response.
0/5
Device Design Challenge
Build a Charge-Selective Organic Device
Select contact and active-layer choices. The educational score reflects simplified energy alignment, charge selectivity and completeness—not full device performance.
Design score: —
Select materials and evaluate the design.
Select materials and evaluate the design.
User Guide
1. Choose a template
Select a Schottky, p–n, donor–acceptor, hybrid, MSM, MIS or MIM starting architecture.
2. Edit the structure
Change material, layer role, thickness, work function, HOMO, LUMO, semiconductor type and display colour.
3. Generate and export
Update the structure and energy diagrams, review idealized barriers and offsets, then export SVG, PNG or JSON.
Interactive Concept Explorer
Choose a term above.
Get Access to the Complete Organic Electronics Research Toolkits™ Library
This public Community Edition is part of the NexSolveAI Organic Electronics Research Toolkits™ Library. Get access to the complete library to explore the available Organic Electronics Research Toolkits and their standalone Community, Research, Professional, XLab and Research Factory editions.
Searchable Glossary
Selected References and Further Reading
- S. M. Sze and K. K. Ng, Physics of Semiconductor Devices, 3rd ed., Wiley, for metal–semiconductor contacts and junction electrostatics.
- J. C. Scott, “Metal–organic interface and charge injection in organic electronic devices,” foundational literature on injection at organic contacts.
- H. Ishii et al., “Energy Level Alignment and Interfacial Electronic Structures at Organic/Metal and Organic/Organic Interfaces,” foundational interface literature.
- V. I. Arkhipov et al., literature on charge injection into disordered organic semiconductors.
- Selected material values in this Community Edition are representative starting points and must be traced to the measurement method and source before scholarly use.
About, License, and Citation
Toolkit Scope
Browser-based structure design and vacuum-referenced energy-level visualization for organic diodes, junctions and related MIS/MIM/MSM structures.
Community License
Public Community Edition for learning, classroom demonstration, preliminary visualization and evaluation, provided through the Organic Electronics Research Toolkits™ Library.
Version and Author
Community Edition v2.2, developed by Dr. Muhammad Hassan Sayyad.
Suggested Citation
Sayyad, M. H. (2026). NexSolveAI Organic Electronics Research Toolkit™ OE-RT-0031: Organic Semiconductor Diodes, Junctions & Energy-Level Builder, Community Edition v2.2. NexSolveAI.
Scientific-use notice
Generated diagrams are schematic design aids. They do not replace UPS/IPES/Kelvin-probe measurements, interface-specific characterization or self-consistent device simulation.
Edition Comparison
Five standalone editions of OE-RT-0031 — each designed for a distinct level of learning, research, simulation, experimentation, or research production.
| Edition | Community (C) | Research (R) | Professional (P) | XLab (X) | Research Factory (F) |
|---|---|---|---|---|---|
| Edition Purpose | Learn & Build | Analyze & Investigate | Simulate & Validate | Experiment & Optimize | Produce Research |
| Primary Focus | Concept learning, device structures and energy-level building | Research-oriented junction and interface investigation | Advanced simulation and validation workflows | Controlled virtual experimentation, parameter exploration and optimization | Guided research-production workflows and research outputs |
| Typical User | High-school, undergraduate and new learners | Undergraduate researchers and MS/PhD students | Advanced researchers and professionals | Researchers conducting systematic experiments and optimization studies | Students and researchers developing structured research studies |
| Relationship to Other Editions | Standalone | Standalone | Standalone | Standalone | Standalone |
| Includes Lower-Edition Sections | Not applicable | No | No | No | No |
| Core Outcome | Understand and build organic diode/junction structures | Investigate device and interface behaviour | Simulate and validate advanced device scenarios | Design experiments and optimize selected parameters | Develop reproducible research outputs through a guided production workflow |