What happens after I drop an EQE file?
The measurement file is converted into an EQE graph by wavelength. From there, the workspace helps you review cumulative Jsc, total integrated Jsc, EQE Bandgap fitting, and Derivative Edge screening.
External Quantum Efficiency
EQE Analysis
Convert EQE measurement files into graphs, then review integrated Jsc and EQE Bandgap fitting in one workflow.
Supported formats
.txt, .log, .csv, .prn, .dat
Available analysis features
- Basic Graph
Convert wavelength and EQE values into a spectrum graph for quick photoresponse review.
Basic graph review depends on correctly parsed wavelength and EQE columns; check source scale and retained point count before comparing files.
- Integrated Jsc
Review cumulative Jsc curves and total integrated Jsc calculated from wavelength and EQE values.
Integrated Jsc depends on wavelength coverage, EQE scale handling, and the integration range, so compare it with the source spectrum before reporting.
- EQE Bandgap
Convert wavelength-based EQE onto photon energy and review the pseudo-Tauc fit range, Eg extrapolation, R2, and fit points.
EQE Bandgap is a fit-derived candidate value; review the pseudo-Tauc range, correction state, R2, and fit points before reporting Eg.
- Derivative Edge
Plot normalized EQE derivative versus photon energy and read the steepest-rise peak as an apparent edge candidate.
Derivative Edge is not a Tauc extrapolation; smoothing and source noise should be reviewed because the peak position comes from d(EQEₙₒᵣₘ)/dE.
What this tool can review
- EQE spectrum visualization
Load wavelength and EQE data and convert it into a graph for photoresponse review.
- Integrated Jsc
Review cumulative Jsc curves and total integrated Jsc values calculated from EQE spectra.
- Bandgap curve review
Compare EQE-derived bandgap curves and selected fit ranges before reading fit results.
- EQE Bandgap
Convert EQE data onto a photon-energy axis and review pseudo-Tauc fit range, Eg extrapolation, R2, and fit-point evidence.
- Derivative Edge
Read the steepest-rise point from d(EQEₙₒᵣₘ)/dE as an apparent optical-edge candidate.
Typical use cases
- Review EQE spectra and cumulative Jsc curves from photovoltaic measurement files.
- Compare multiple EQE files before preparing figures or reports.
- Inspect integrated Jsc values calculated from wavelength and EQE data.
- Review EQE Bandgap fit range, Eg extrapolation, R2, and correction state.
FAQ
What data does EQE Bandgap use?
EQE Bandgap uses wavelength and EQE values, converts wavelength to photon energy, and shows the selected fit range, fit line, Eg estimate, R2, and fit-point count.
What does Derivative Edge add?
Derivative Edge normalizes EQE, calculates d(EQEₙₒᵣₘ)/dE on the photon-energy axis, and reads the peak as an apparent optical-edge candidate without line extrapolation.
How are my measurement files handled?
Files uploaded to this analysis tool are processed in the current browser session for graph conversion and analysis. The tool does not send files outside or save them without user permission.
Supported workflow
- Graph Conversion turns EQE measurement files into wavelength-EQE views for photoresponse review.
- Integrated Jsc reviews cumulative Jsc curves and total integrated Jsc from wavelength and EQE values.
- Basic Graph supports quick review of wavelength-EQE curves before fitting or export.
- EQE Bandgap reviews pseudo-Tauc fit range, Eg extrapolation, R2, and fit-point evidence.
- Derivative Edge reviews the normalized EQE derivative peak as an apparent optical-edge candidate.