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Scanning Spectroscopy for Next-Generation Solar Cells
- Program: Electrical and Computer Engineering
- Course: EN.520.506 ECE Undergraduate Research
- Year: 2025
Project Description:
We measured the photoluminescence (PL) of next-generation MAPbI2.6Br0.2Cl0.2(TA) perovskite solar cells, working with our collaborators at NIST and the University of St. Andrews, to evaluate their performance for indoor energy harvesting applications. Using a custom optoelectronic scanning setup, we extracted the quasi-Fermi level splitting (QFLS). The setup incorporated a custom-designed sample holder and mask, which controlled the illumination spot size and enabled normalization of measurements to a defined area. By analyzing the high-energy region of the PL spectrum based on the generalized Planck equation, we generated a QFLS map at a 25 μm resolution across a 3 mm × 6 mm device area. The map shows spatial non-uniformities and highlights regions with reduced energy levels, suggesting non-radiative recombination and compromised device performance. The insights support the evaluation and development of photovoltaic cells that work at the low power levels associated with indoor lighting, allowing for novel applications harvesting waste energy.
Project Photo:
Photograph of laser beam alignment for photoluminescence (PL) measurement
