Goal of the proposed experimental work is the verification and calibration of a selfmade (UNISA) setup, developed for the measurement of the point-wise quantum yield spectrum in-situ during the exposure of Perovskite based Tandem solar cells to energetic particles and radiation. Some Perovskite based TANDEM solar cells, have been shown to be extremely stable under Proton irradiation and are hence good candidates for future thin-film space photovoltaics. The setup, based on LED excitation at different wavelengths and conversion of the generated photocurrent in a proportional frequency has been already successfully tested for the in-situ degradation monitoring of crystalline silicon solar cells under high energy proton irradiation under vacuum. In the moment we work on the modification of the setup for the characterization of TANDEM solar cells. It would be necessary however to calibrate the system and the FHI-ISE solar cell characterization facilities would be the ideal place for this.
Status: Ongoing
Date of proposal: 25/02/2022
Start date: 06/07/2022
End Date: 12/07/2022
Used Instruments: Compact in-situ quantum yield measurement setup. PL imaging system. EQE measurement tools.
Experimental Technique: Quantum Yield Spectrum Measurement. Photoluminescence (PL) Imaging. External Quantum Efficiency (EQE) Measurement.
Experiment Description: The project involved the calibration of a setup developed for in-situ quantum yield spectrum measurement during exposure of Perovskite-based Tandem solar cells to energetic particles and radiation. The setup was previously tested for degradation monitoring of crystalline silicon solar cells under high energy proton irradiation. The project aimed to complement the development of the TANDEM characterization setup by testing it with thin-film TANDEM cells and perovskite-based TANDEM cells.
Type Samples: Micromorph TANDEM solar cells. Perovskite/Perovskite TANDEM solar cells. FZ-cSi and CZ-Si based single junction solar cells.
Sample Description: A variety of samples including micromorph TANDEM, perovskite-based TANDEM, and silicon-based single junction solar cells.
Experiment Data Type: Data on quantum yield spectra, PL imaging, and EQE characteristics.
Characterization Technics: In-situ quantum yield spectrum measurement. Photoluminescence imaging for homogeneity analysis. EQE measurement for efficiency characterization.
Characterization Data Type: Quantum yield spectra. PL imaging results showing homogeneity and radiation effects. EQE characteristics of different TANDEM cells.
Analyzed Data: Effectiveness of the setup for continuous monitoring of photocurrent spectral changes during high energy ion irradiation. Correlation between PL intensity and solar cell parameters. Comparison between micromorph and all-perovskite TANDEM cells for calibration purposes.
Main Targets Project: Calibration of the in-situ quantum yield measurement setup for TANDEM solar cells. Validation of micromorph TANDEM cells as stable reference cells for calibration of perovskite-based TANDEM solar cells.
Main Achievements Findings: Confirmation that micromorph TANDEM cells are suitable as reference cells for calibration. Successful characterization of various samples indicating the setup's effectiveness for continuous monitoring. Identification of correlations between PL intensity and solar cell parameters post-irradiation.
Review 8
How would you describe your experience with the VIPERLAB opportunity? How did the experience/visit at FHI-ISE meet your expectations?
Very productive regarding the research and very interesting, getting to know more about the FHI-ISE institute in general.
Did you face any difficulties during your visit or application process?
I did not face any difficulties during the (last-minute) application process and during my stay at the FHI-ISE and want to thank Dr. Schubert again for the possibility, to use the interesting characterization facilities in his research group and his collaborators for their constant help. Some initial problems to adequately contact the new-type of all-perovskite Tandem solar cells could so be resolved already within my short stay at the institute.
Does this VIPERLAB experience at FHI-ISE bring you closer to your research objectives? How?
Definitely yes. We could verify, that micromorph solar cells can be used as stable reference cells for the Perovskite Tandem cell quantum yield characterization and got additionally very useful data (PL,IV light and QY) regarding the radiation hardness of conventional and thin-film solar cells.
What other VIPERLAB activities have you participated in, or would you like to participate in?
We participated in May 2023in the “2nd VIPERLAB Workshop on Precise Measurement of Perovskite Silicon Tandem Solar Cells “ in Portici (Italy) and would be interested to participate in similar VIPERLAB events (eventually also on-line).
Do you intend or already did publish/present your collected results in a paper or conference?
A part of the results has already been presented within an invited lecture at the Material Reseasrch Society (MRS) 2023 spring meeting (virtual edition) under the title. “In-situ and ex-situ Spectral Response characterization of the Radiation Damage and subsequent Recovery during Proton Irradiation of Silicon and Perovskite based Solar Cells” (co-authored by 3 researchers from the FHI-ISE group). A publication of this content is in preparation.