Spectroscopic Analysis for the Identification of Loss Mechanisms in Back‐Contact Perovskite Solar Cells

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