Wide band gap perovskite solar cell
The aim of this proposal is to develop wide band gap perovskite solar cell, to be integrated later in the top of silicon heterojunction solar cell. First, we will focus on reproducing good quality FAPb(Ix,Br 1-x)3 perovskite absorber in the IMEC process. Then, the best wide band gap FAPb(Ix,Br 1-x)3 perovskite absorber will be incorporated in the IMEC stack as a reference p-i-n perovskite solar cell with Cu electrode. The resulted perovskite solar cells will be characterized by IV-measurements and MPP tracking. Based on the previous result we can optimize further the efficiency of the perovskite solar cell by adapting the p and n interfaces to have better energy level alignment, by adding other thin films. Afterwards, the best resulted solar cell with the best p- and -n-side interface materials will be used in the same stack with ITO top-electrode done by soft sputtering. Finally, we will perform IV-measurements with Si-bottom cell to determine how such tandem stack performs.
Status: Ongoing
Date of proposal: 03/12/2021
Start date: 06/06/2022
End Date: 01/07/2022
Used Instruments: NEBULA from Angstrom engineering (for sputtering NiOx). Fluo Time 300 fluorescence lifetime spectrometer 'Picoquant'.
Experimental Technique: Sputtering of NiOx as a hole-transporting layer. Fabrication of perovskite solar cells (PSCs) with various compositions. Steady-state and time-resolved photoluminescence measurements.
Experiment Description: The study focused on the fabrication and characterization of wide bandgap perovskite solar cells using different perovskite compositions. It involved varying the cation and halide composition in the perovskite layer and analyzing their impact on the stability and performance of PSCs.
Type Samples: Perovskite solar cells with compositions FAPb(I0.7Br0.3)3 and (FA0.65MA0.2Cs0.15)Pb(I0.8Br0.2).
Sample Description: Two perovskite compositions were used: FAPb(I0.7Br0.3)3, with FA as the only cation. (FA0.65MA0.2Cs0.15)Pb(I0.8Br0.2), a mixed cation perovskite.
Experiment Data Type: Photoluminescence data under continuous light excitation. Time-resolved photoluminescence data for carrier dynamics study. Current-voltage (J-V) characteristics of the fabricated solar cells.
Characterization Technics: Photoluminescence spectroscopy for bandgap and stability analysis. Electrical characterization of devices.
Characterization Data Type: Photoluminescence spectra and band-gap measurements. Lifetime and stability data of perovskite films. Efficiency parameters of PSCs.
Analyzed Data: Comparison of the stability of different perovskite compositions under light exposure. Analysis of the effect of cation and halide composition on the performance of PSCs.
Main Targets Project: Developing wide bandgap perovskite solar cells with improved stability and efficiency. Evaluating the impact of composition on the performance of PSCs.
Main Achievements Findings: Found that (FA0.65MA0.2Cs0.15)Pb(I0.8Br0.2) exhibited significant stability with no red shift in PL, indicating less photo-induced phase segregation. The bandgap of this composition was around 1.67 eV, suitable for tandem solar cell applications. Fabricated PSCs with (FA0.65MA0.2Cs0.15)Pb(I0.8Br0.2) showed competitive performance with up to 16% efficiency.
Review 6
How would you describe your experience with the VIPERLAB opportunity? How did the experience/visit at IMEC meet your expectations?
VIPERLAB has been a big part of my growth as a researcher and has brought me closer to achieving my research goals in the perovskite solar cells area, which had a positive impact on me personally and professionally.My visit at IMEC met my expectations as the organization of the trainings, experiments, and meetings were well-planned and structured.The program granted me with valuable insights to improve my skillset and knowledge in the perovskite solar cells area.In fact, I had the opportunity to work in IMEC-Energy Ville2 Laboratory which was equipped with sophisticated state-of-the-art facilities. I gained more experience in fabricating thin films using various tools like vacuum thermal evaporator, sputtering machine, spin coater, as well as characterising them by some technics like Photoluminescence Spectrometer and Solar Simulator.Moreover, the communication and exchanges with IMEC expert researchers went smoothly and were incredibly insightful, as I expanded my knowledge significantly from the information provided and their recommendations within our discussions.
Did you face any difficulties during your visit or application process?
No, I didn't encounter any significant difficulties during my visit or application process. Everything went quite smoothly, and I had a pleasant experience overall.
Does this VIPERLAB experience at IMEC bring you closer to your research objectives? How?
Absolutely! VIPERLAB experience at IMEC was a good start for me as a new Ph.D. student and has been helpful for my research on perovskite solar cells. In fact, I got to work on an exciting project and collaborate with experienced researchers from IMEC. They guided me and shared their significant know-how about perovskite solar cell technologies, which improved my research skills. Through working on a practical problem in a great infrastructure, VIPERLAB has greatly influenced my research direction and motivated me to explore new ideas.
What other VIPERLAB activities have you participated in, or would you like to participate in?
I have attended some online events on the KEP platform.I would like eventually to participate in summer workshops/schools and benefit from the infrastructure of one of the prestigious laboratories in thin films fabrication in the framework of another grant.
Do you intend or already did publish/present your collected results in a paper or conference?
We intend to publish the results , but the first step would be concertation with IMEC to be sure that we do not divulge any sensitive or confidential data, the mention of the VIPERLAB financial support from the European Union’s Horizon 2020 research and innovation program (grant N°101006715) is obvious. However, the know-how shared with us allowed us to significantly improve the process in our lab