Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/32943
Title: | Intermediate scale bandgap fluctuations in ultrathin Cu(In,Ga)Se2 absorber layers | Authors: | DE WILD, Jessica BULDU KOHL, Dilara KOHL, Thierry BIRANT, Gizem BRAMMERTZ, Guy MEURIS, Marc POORTMANS, Jef VERMANG, Bart |
Issue Date: | 2020 | Publisher: | AMER INST PHYSICS | Source: | JOURNAL OF APPLIED PHYSICS, 128 (16) (Art N° 163102) | Abstract: | Ultrathin single- and three-stage Cu(In,Ga)Se-2 absorber layers were analyzed with room temperature photoluminescence (PL) spectra. An anomalous blueshift was observed upon increasing carrier injection for both samples. This blueshift was attributed to the presence of bandgap fluctuations that are of the same order as the minority carrier diffusion length. From time resolved measurements, a diffusion length of a few 100nms was deduced. The single-stage spectrum consists of two peaks, and the sample was, therefore, also analyzed by hyperspectral imaging, providing lateral PL and reflectance data with 1 mu m resolution. Marginal variations were observed in the PL yield and spectra. This homogeneity could again be attributed to an intermediate scale of the bandgap fluctuation with an upper limit of 1 mu m for the scale of the lateral bandgap fluctuations. The two peaks in the PL spectra of the single-stage sample could be attributed to interference, and correction methods were applied. The bandgap fluctuations were extracted for the three-stage and single-stage sample and were 45meV and 72 +/- 3meV, respectively. It is suggested that this difference is attributed to the smaller grains and larger amount of grain boundaries in the single-stage sample. | Notes: | de Wild, J (corresponding author), Hasselt Univ, Inst Mat Res IMO, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; de Wild, J (corresponding author), IMEC, IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; de Wild, J (corresponding author), EnergyVile 2, Thor Pk 8320, B-3500 Genk, Belgium. Jessica.deWild@imec.be |
Document URI: | http://hdl.handle.net/1942/32943 | ISSN: | 0021-8979 | e-ISSN: | 1089-7550 | DOI: | 10.1063/5.0024840 | ISI #: | WOS:000586746900001 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
5.0024840.pdf Restricted Access | Published version | 4.15 MB | Adobe PDF | View/Open Request a copy |
JdeWild_201010_JoAP.pdf | Peer-reviewed author version | 1.01 MB | Adobe PDF | View/Open |
WEB OF SCIENCETM
Citations
5
checked on Oct 15, 2024
Page view(s)
54
checked on Jul 31, 2022
Download(s)
46
checked on Jul 31, 2022
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.