Calculate JSC from EQE
Paste or upload external quantum efficiency (EQE / IPCE) data to calculate short-circuit current density (JSC) by integrating with the AM1.5G solar spectrum. Also estimates the optical bandgap via tangent-line extrapolation of the absorption edge.
Method
The short-circuit current density is calculated by integrating the external quantum efficiency with the AM1.5G photon flux using the trapezoidal rule:
JSC = q × ∫ EQE(λ) × Φ(λ) dλ
where Φ(λ) = E(λ) × λ / (h×c) is the spectral photon flux derived from the AM1.5G spectral irradiance E(λ) (ASTM G173-03, Global tilt).
Frequently Asked Questions
What is External Quantum Efficiency (EQE)?
EQE, also known as IPCE (Incident Photon-to-Current Efficiency), is the ratio of collected charge carriers to incident photons at each wavelength.
How is JSC calculated from EQE?
JSC is calculated by integrating the product of EQE and the AM1.5G photon flux over all wavelengths: JSC = q × ∫ EQE(λ) × Φ(λ) dλ.
What is the AM1.5G spectrum?
AM1.5G (Air Mass 1.5 Global) is the standard reference solar spectrum defined by ASTM G173-03, representing sunlight at 48.2° zenith angle with a total integrated irradiance of about 1000 W/m².
What file formats are supported?
The parser auto-detects comma, tab, semicolon, and whitespace delimited data. You can paste raw data, upload CSV or TSV files, or copy from a spreadsheet.
How is the optical bandgap estimated?
The bandgap is estimated by tangent-line extrapolation of the EQE absorption edge, using the inflection point method to find the steepest descent on the long-wavelength side.