Semiconductor Physics Tools

A JavaScript library for Parameter Extraction of the Five-Parameter Diode Model.

Parameters Calculated:

1. Vth: Threshold Voltage
2. Rsh: Shunt Resistance (Leakage)
3. Rs: Series Resistance (Contact quality)
4. Io: Saturation Current (Material quality)
5. n (nte/ncc): Ideality Factor (Physics perfection)

Installation

npm install diode-analyzer

Usage

import {
  calculateVth,
  calculateRsh,
  processStepNine,
  findThresholdIndex,
  processStepTen,
} from "diode-analyzer";

// Example: Calculate Threshold Voltage (Vth)
const voltages = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0];
const currents = [
  0.000000035767, 0.00000004389, 0.000000057498, 0.000000076319, 0.000000097812,
  0.000000121201, 0.00000015031, 0.00000018914, 0.000000212217, 0.000000248738,
];

const vth = calculateVth(voltages, currents);
console.log("Threshold Voltage:", vth);

// Example: Calculate Shunt Resistance (Rsh)
const resistances = [28842.998823692906, 5724.990842589983, 3234.683524429178];
const rshResult = calculateRsh(voltages, resistances);
console.log("Rsh:", rshResult.rsh);
console.log("Rsh Formatted:", rshResult.rshFormatted);

// Example: Find threshold index
const thresholdIndex = findThresholdIndex(voltages, vth);
console.log("Threshold Index:", thresholdIndex);

// Example: Process Step 9 (Io and nTE calculation)
const lnlValues = [
  -17.14623801998393, -16.941583763247255, -16.671516179696415,
];
const step9Result = processStepNine(voltages, lnlValues, thresholdIndex);
console.log("Io:", step9Result.io);
console.log("nTE:", step9Result.nte);

// Example: Process Step 10 (Rs and ncc calculation)
const dvdlnI = [0.0026878518619670205, 0.488628976472591, 0.3702776863672527];
const step10Result = processStepTen(currents, dvdlnI);
console.log("Rs:", step10Result.rs);
console.log("ncc:", step10Result.ncc);

API Reference

calculateVth(voltages, currents)

Calculates Threshold Voltage using K-means clustering on rolling slopes.

• Parameters:
  • voltages (Array): Array of voltage values
  • currents (Array): Array of current values
• Returns: number - The threshold voltage value

calculateRsh(voltages, resistances)

Calculates Shunt Resistance (Rsh) by finding the maximum resistance value.

• Parameters:
  • voltages (Array): Array of voltage values
  • resistances (Array): Array of resistance values
• Returns: Object - { rsh: number, rshFormatted: string, success: boolean }

findThresholdIndex(voltages, vth)

Finds the 1-based index of the threshold voltage in the voltage array.

• Parameters:
  • voltages (Array | string): Array of voltage values or comma-separated string
  • vth (number): Threshold voltage value
• Returns: number | null - 1-based index or null if not found

processStepNine(voltages, lnlValues, threshold)

Calculates Io (Saturation Current) and nTE (Ideality Factor) using linear regression.

• Parameters:
  • voltages (Array): Array of voltage values
  • lnlValues (Array): Array of ln(I) values
  • threshold (number): Threshold index (1-based)
• Returns: Object - { io: string, nte: string, success: boolean }

processStepTen(currents, dvdlnI)

Calculates Rs (Series Resistance) and ncc (Ideality Factor) using segmentation analysis.

• Parameters:
  • currents (Array): Array of current values
  • dvdlnI (Array): Array of dV/d(ln(I)) values
• Returns: Object - { rs: string, ncc: string, success: boolean }

License

ISC