Electrical properties of perovskite solar cells by illumination intensity and temperature-dependent photoluminescence imaging

Hybrid organic-inorganic perovskite solar cells (PSCs) are one of the most promising candidates for next generation photovoltaics. Further improvement in their performance, particularly efficiency, durability and reproducibility, requires a deep understanding of recombination losses during fabrication and within a device itself. In this work, we report a contactless, imaging-based procedure to spatially resolve electronic properties of PSCs including implied open-circuit voltage (iV(oc)) and its temperature coefficient, ideality factor (n(id)) and activation energy of recombination (E-A) by employing illumination intensity and temperature-dependent photoluminescence. The illumination intensity dependence of iV(oc) allows the extraction of n(id) whereas its temperature dependence allows the extraction of the temperature coefficient and E-A. This imaging approach is then applied to investigate changes of these electronic parameters on fully and partially fabricated devices.

Automated summary

A contactless, imaging-based procedure was reported to spatially resolve electronic properties of PSCs, including iV(oc), n(id), and E-A, using illumination intensity and temperature-dependent photoluminescence. The illumination intensity and temperature dependence allowed for the extraction of electronic parameters and investigation of their changes on fully and partially fabricated devices.