Back-contact perovskite solar cells offer a significant potential to reach high efficiency due to reduced parasitic absorption from the top surface. However, the currently reported efficiencies are considerably lower (<10%) than planar perovskite solar cells (>20%). Herein, back-contact perovskite solar cells are fabricated to study loss mechanisms that cause low device efficiency. This work spatially resolves the short-circuit current, open-circuit voltage, photoluminescence quantum yield, carrier lifetime, and external quantum efficiency of the devices. The results indicate that the front surface recombination, increased nonradiative recombination at hole contact layer/perovskite interface, and the extraction barriers are three main mechanisms limiting devices from achieving high efficiencies.

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The Netherlands Organisation for Scientific Research (NWO)
Adv. Mater. Technol.
Nanoscale Solar Cells

Sun, H., Gillespie, S., Rigter, S., van der Burgt, J., Datta, K., & Garnett, E. (2023). Spectroscopic Analysis for the Identification of Loss Mechanisms in Back-Contact Perovskite Solar Cells. Adv. Mater. Technol., 8(16), 2300241: 1–7. doi:10.1002/admt.202300241