Publication date: 22nd July 2026
Understanding nonradiative recombination in metal halide perovskites is essential for accurately describing their photophysics and efficiency limits. While first-order trap-assisted recombination is well established, the existence and origin of second-order nonradiative recombination have remained controversial because similar experimental observations can be explained by multiple competing mechanisms[1,2].
Here, we provide direct experimental evidence for second-order nonradiative recombination in triple-cation perovskite thin films and demonstrate that it is consistently explained by an Auger-assisted trapping mechanism. We combine excitation-fluence-dependent transient and steady-state photoluminescence measurements over a wide carrier density range with a unified kinetic model that quantitatively reproduces both datasets using a single set of parameters[3]. This approach enables the separation of the contributions from shallow traps, deep traps, and Auger-assisted trapping.
Our results resolve a long-standing ambiguity in the interpretation of carrier recombination dynamics and show that neglecting Auger-assisted trapping leads to an overestimation of the intrinsic bimolecular radiative recombination coefficient and an inaccurate assessment of theoretical efficiency limits. The identified recombination pathway is particularly relevant under practical solar-cell operating conditions, including one-sun illumination, where it contributes significantly to nonradiative losses.
These findings provide new insight into the recombination physics of triple-cation perovskites and establish a robust framework for identifying dominant recombination pathways, enabling more accurate modelling of perovskite photovoltaic and light-emitting devices.
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