# 📐 L2 Spec — Solar Cell Device Physics (Shockley-Queisser + drift-diffusion) Mismatch-Only Spec
**ID:** `L2-493-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-493`](/artifact/l1/L1-493)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554144
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| T k | — | 253 – 353 |
| Area cm2 | — | 0.01 – 10000 |
| N bias points | — | 50 – 1000 |
| Illumination suns | — | 0.01 – 100 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.015 + 0.005*abs(T_K-298)/30 + 0.01*log10(illumination_suns+0.01)
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`a4f9558b55918b3d1bfc6ba6556c4815df7d87b48073123130344c8c0239a783`
## 5. On-chain Registration
- **Chain hash:** `0x9b3a4da270a25457e2bd9361de077d10c9d554979ac282032a2b1a6d2dad418f`
- **Chain tx hash:** `0x909a6fb5ee1815cf4c4cbc7c60234fd7c4c93fc51f03f16c3631a5d1f35ebd37`
- **Chain block:** `41554144`
---
## File Mapping
This bundle consists of: `L2-493-001.md`, `L2-493-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-493-001.md` | Source of truth — edit this | Human or LLM |
| `L2-493-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-493-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._