ShaneLogic/cigs-material-composition-engineering
.claude/skills/cigs-material-composition-engineering/SKILL.md
Use this skill when engineering Cu(InGa)Se2 material properties, optimizing composition for device performance, or analyzing defect physics. Covers bandgap engineering, composition tolerance, and intrinsic defects.
$ install --global
skillsauthnpx skillsauth add ShaneLogic/SolarLab cigs-material-composition-engineeringInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- cigs-material-composition-engineering
- description:
- Use this skill when engineering Cu(InGa)Se2 material properties, optimizing composition for device performance, or analyzing defect physics. Covers bandgap engineering, composition tolerance, and intrinsic defects.
CIGS Material Composition and Engineering
When to Use
- Engineering Cu(InGa)Se2 material properties
- Optimizing composition for device performance
- Analyzing defect physics and recombination mechanisms
- Designing bandgap-graded structures
Bandgap Engineering
Base Material
- CuInSe2 bandgap: 1.04 eV
Alloying Effect
- Partial substitution of In with Ga increases bandgap
- Target range: 1.1 - 1.2 eV
- Result: Substantial efficiency increase
Composition Tolerance
Structural Properties
- Lattice type: Chalcopyrite (ratio c/a close to 2)
- Distortion: Tetragonal from differing Cu-Se vs In/Ga-Se bond strengths
Composition Window
- Cu/(In+Ga) ratio: 0.7 to nearly 1.0
- High efficiency possible across this entire range
Defect Physics Tolerance
Key defect complex:
- 2 Cu vacancies + In on Cu antisite
- Formation energy: Low
- Electrical activity: Inactive
- Result: Cu-poor/In-rich compositions acceptable without adverse effects
Grain Boundary Properties
- Inherently passive
- Efficient cells possible with grain sizes < 1μm
- No significant recombination at grain boundaries
Intrinsic Defects
Defect Types
- Three vacancies: V_Cu, V_In/Ga, V_Se
- Three interstitials: Cu_i, In/Ga_i, Se_i
- Six antisites: Cu_In/Ga, In/Ga_Cu, Cu_Se, Se_Cu, In/Ga_Se, Se_In/Ga
Dominant Defects (Lowest Formation Energy)
- Copper vacancy (V_Cu)
- Indium or Gallium vacancy (V_In or V_Ga)
- Cu_In/Ga antisite (copper on indium/gallium site)
- Selenium vacancy (V_Se)
Special Defect Characteristics
Selenium Vacancy (V_Se)
- Type: Amphoteric defect
- Significance: Can explain metastable effects in solar cells
III_Cu Antisite (In_Cu or Ga_Cu)
- Related to: DX center
- Effect: Could limit doping in wide bandgap Cu(InGa)Se2
Shallow Defects
Identified by: Photoluminescence and Hall effect
- Number: Four dominant shallow defects
- Types: Three acceptors, one donor
Deep Defects
Identified by: Capacitance measurements
N2 Defect
- Energy level: 250-300 meV from valence band
- Effect: Does NOT act as recombination center
800 meV Defect
- Energy level: 800 meV from valence band
- Effect: May act as recombination center in high-Ga alloys
Band-gap Grading Strategy
Objective
Form band-gap gradients to separately reduce recombination and collection losses
Gradient Configuration
- Front (Cu(InGa)Se2/CdS interface): Wider band-gap
- Bulk (edge of space charge region): Narrower band-gap
Mechanism and Benefits
- Reduced Recombination: Wider band-gap at interface increases Voc
- Increased Collection: Smaller band-gap in bulk enables higher optical absorption and Jsc
Optical Properties
Absorption Coefficient
- α: > 3×10⁴ /cm for energies > 1.3 eV
Absorption Depth
- 95% of incident solar illumination absorbed in 1μm thickness
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