/Investigating Degradation Mechanisms in Wide-Bandgap Perovskites for Tandem Solar Cell Applications

Investigating Degradation Mechanisms in Wide-Bandgap Perovskites for Tandem Solar Cell Applications

Genk | More than two weeks ago

Explore the key mechanisms behind perovskite solar cells degradation, and contribute to its application in state of the art solar cells

With over a decade of intensive research on perovskite solar cells (PSCs), significant progress has been made, resulting in certified power conversion efficiencies (PCEs) of 26.1% for single-junction cells and 33.9% for perovskite/silicon (Si) tandem solar cells. Tandem solar cells combining perovskite absorbers with silicon hold tremendous promise for achieving record-breaking PCEs. However, to serve as an efficient top cell, perovskite absorbers must possess a wider bandgap, typically ranging from ~1.65 to 1.75 eV, considerably higher than that of widely used α-FAPbI3 or MAPbI3 or mixed cation-anion compositions. One commonly adopted approach for increasing the bandgap of halide perovskites involves employing mixtures of halides, such as replacing I with Br. However, these wide-bandgap mixed-halide perovskites are notoriously susceptible to degradation under operational conditions. Hence, there exists an urgent need to comprehensively understand the degradation mechanisms and devise effective mitigation strategies.

 

In this project, the candidate will acquire an in-depth understanding of the degradation mechanisms in wide bandgap perovskites. At imec, we have already developed wide-bandgap perovskite compositions, enabling the candidate to commence work on thin-film and device fabrication. The candidate will leverage state-of-the-art tools for device fabrication and gain hands-on experience in processing techniques including sputtering, thermal evaporation, spin coating, and blade coating. To unravel the degradation mechanisms, a comprehensive characterization toolbox will be employed. Structural and morphological analyses will be conducted using techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). For electrical investigations, we will employ advanced techniques like admittance spectroscopy (AS) and deep-level transient spectroscopy (DLTS). To probe the optical properties, steady-state, and time-resolved photoluminescence spectroscopy (TRPL) will be employed. Furthermore, elemental analysis will be conducted using techniques like Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) and X-ray photoelectron spectroscopy (XPS). Through this multidisciplinary approach, the candidate will not only gain a deep understanding of degradation mechanisms in wide bandgap perovskites but also develop valuable skills in materials characterization and device fabrication techniques.

 

This research will be performed at the EnergyVille laboratories in Genk, the PV laboratory from imec, with close collaboration with imo-imomec. imo-imomec (IMEC-UHasselt) PV research teams are internationally recognized, thanks to its experts and world-class technology labs (Thin Film PV lab). The student has a background in physics, chemistry, nanomaterials, or similar and an interest in photovoltaics and experimental work.



Type of project: Combination of internship and thesis, Internship, Thesis

Duration: 6-12 months

Required degree: Master of Science, Master of Engineering Science, Master of Engineering Technology

Required background: Energy, Materials Engineering, Nanoscience & Nanotechnology, Physics, Electrotechnics/Electrical Engineering, Chemistry/Chemical Engineering

Supervising scientist(s): For further information or for application, please contact: Anurag Krishna (Anurag.Krishna@imec.be) and Jonathan Parion (Jonathan.Parion@imec.be)

Imec allowance will be provided for students studying at a non-Belgian university.

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