Abstract
Laterally resolved luminescence techniques offer the possibility to examine thin film semiconductors with respect to the inhomogeneities of their opto-electronic, optical and chemical properties. Especially the integrated photoluminescence (PL) yield and splitting of quasi-Fermi levels (QFL) are of interest as well as the derived optical properties like the optical band gap, the Urbach energy and the absorption due to defect states within the band gap. For a large set of individual PL spectra, the integration and determination of the QFL-splitting can be very time-consuming. Especially for films with varying composition, resulting in different band gaps, the fitting parameters can vary from pixel to pixel. With the open source tool PARPLE (PARallel PL Evaluation) the evaluation of recorded maps is automatized regarding the fitting procedure and parallelized using multiple CPU cores for performance improvement. Program summaryProgram title: PARPLECatalogue identifier: AEWJ_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEWJ_v1_0.htmlProgram obtainable from: CPC Program Library, Queen’s University, Belfast, N. IrelandLicensing provisions: General Public Licence (GPU) v3No. of lines in distributed program, including test data, etc.: 12,173No. of bytes in distributed program, including test data, etc.: 15,156,143Distribution format: tar.gzProgramming language: C.Computer: Any computer running a GCC compiler.Operating system: Linux, Mac OS X, Windows (+Cygwin).RAM: Several ten–several hundred MB depending on number of recorded PL spectra.Classification: 7.4.External routines: GNU Scientific Library, libpng, GNU OpenMPNature of problem:Evaluation of PL spectra and extraction of opto-electronic properties including integrated PL yield, splitting of quasi-Fermi levels and optical band gap. The spectral shift of the PL spectra is covered by use of an adaptive fit procedure.Solution method:Adaptive linear fit of the high energy slope.Restrictions:For a full analysis, the PL spectra must satisfy the requirements of Planck’s generalized law regarding the steady-state condition, the absorption of high-energy photons and that the relaxation time is fast then the recombination time. The experimental setup must be spectrally calibrated.Unusual features:Adaptive linear fit, implemented parallelization.Running time:A few seconds–a few minutes
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