In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation
In this study, an in-depth photoluminescence (PL) analysis of Cu _2 GeS _3 microcrystals under pulsed and continuous-wave (CW) excitation is performed to explore the optical properties and defect structure of this promising novel absorber material for indoor photovoltaics. A rich low-temperature ( T...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | JPhys Energy |
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| Online Access: | https://doi.org/10.1088/2515-7655/adc836 |
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| author | Jüri Krustok Joel Kokla Reelika Kaupmees Maarja Grossberg-Kuusk Marit Kauk-Kuusik |
| author_facet | Jüri Krustok Joel Kokla Reelika Kaupmees Maarja Grossberg-Kuusk Marit Kauk-Kuusik |
| author_sort | Jüri Krustok |
| collection | DOAJ |
| description | In this study, an in-depth photoluminescence (PL) analysis of Cu _2 GeS _3 microcrystals under pulsed and continuous-wave (CW) excitation is performed to explore the optical properties and defect structure of this promising novel absorber material for indoor photovoltaics. A rich low-temperature ( T = 8 K) PL spectra with multiple peaks was detected by both excitation sources and analyzed in detail. The edge emission, including free and bound excitons as well as unique trion emission at 1.575 eV, which becomes dominant under the pulsed laser excitation, enabling clear detection of its properties. At higher temperatures also band-to-band emission is observed under the CW excitation, and the donor-acceptor pair recombination with its phonon replica is dominating the PL spectra revealing a shallow donor defect with an ionization energy of 35 meV and a slightly deep acceptor defect with an ionization energy of 119 meV. In addition, from the temperature dependencies of the PL peaks, an extremely weak electron-phonon coupling in CGS was found. The observed edge emission and detected rather shallow defects emphasize the high crystalline quality and the suitability of Cu _2 GeS _3 for photovoltaic applications. |
| format | Article |
| id | doaj-art-a9e8e55a0f7943b7ab8c2c56e4ffe2f8 |
| institution | OA Journals |
| issn | 2515-7655 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | JPhys Energy |
| spelling | doaj-art-a9e8e55a0f7943b7ab8c2c56e4ffe2f82025-08-20T02:11:34ZengIOP PublishingJPhys Energy2515-76552025-01-017303500310.1088/2515-7655/adc836In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitationJüri Krustok0https://orcid.org/0000-0002-4671-2332Joel Kokla1https://orcid.org/0009-0003-9022-201XReelika Kaupmees2https://orcid.org/0000-0002-1766-4837Maarja Grossberg-Kuusk3https://orcid.org/0000-0003-3357-189XMarit Kauk-Kuusik4https://orcid.org/0000-0003-0071-8568Department of Materials and Environmental Technology, Tallinn University of Technology , Ehitajate tee 5, 19086 Tallinn, EstoniaDepartment of Materials and Environmental Technology, Tallinn University of Technology , Ehitajate tee 5, 19086 Tallinn, EstoniaDepartment of Materials and Environmental Technology, Tallinn University of Technology , Ehitajate tee 5, 19086 Tallinn, EstoniaDepartment of Materials and Environmental Technology, Tallinn University of Technology , Ehitajate tee 5, 19086 Tallinn, EstoniaDepartment of Materials and Environmental Technology, Tallinn University of Technology , Ehitajate tee 5, 19086 Tallinn, EstoniaIn this study, an in-depth photoluminescence (PL) analysis of Cu _2 GeS _3 microcrystals under pulsed and continuous-wave (CW) excitation is performed to explore the optical properties and defect structure of this promising novel absorber material for indoor photovoltaics. A rich low-temperature ( T = 8 K) PL spectra with multiple peaks was detected by both excitation sources and analyzed in detail. The edge emission, including free and bound excitons as well as unique trion emission at 1.575 eV, which becomes dominant under the pulsed laser excitation, enabling clear detection of its properties. At higher temperatures also band-to-band emission is observed under the CW excitation, and the donor-acceptor pair recombination with its phonon replica is dominating the PL spectra revealing a shallow donor defect with an ionization energy of 35 meV and a slightly deep acceptor defect with an ionization energy of 119 meV. In addition, from the temperature dependencies of the PL peaks, an extremely weak electron-phonon coupling in CGS was found. The observed edge emission and detected rather shallow defects emphasize the high crystalline quality and the suitability of Cu _2 GeS _3 for photovoltaic applications.https://doi.org/10.1088/2515-7655/adc836photoluminescenceexcitonstrionsCW laserpulsed laserDA pairs |
| spellingShingle | Jüri Krustok Joel Kokla Reelika Kaupmees Maarja Grossberg-Kuusk Marit Kauk-Kuusik In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation JPhys Energy photoluminescence excitons trions CW laser pulsed laser DA pairs |
| title | In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation |
| title_full | In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation |
| title_fullStr | In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation |
| title_full_unstemmed | In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation |
| title_short | In-depth photoluminescence analysis of Cu2GeS3 microcrystals under pulsed and continuous-wave excitation |
| title_sort | in depth photoluminescence analysis of cu2ges3 microcrystals under pulsed and continuous wave excitation |
| topic | photoluminescence excitons trions CW laser pulsed laser DA pairs |
| url | https://doi.org/10.1088/2515-7655/adc836 |
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