The TRUCPL decays were fitted using the biexponential function in Equation 3 (see Figure and SI Table ). We observed a decrease in the average lifetime of the devices with 3 mM TCA (9.11 µs) compared to control devices without TCA (15.50 µs). Additionally, we observed a ~50% decrease in the UC threshold for devices with TCA (decreasing from 4.50 W/cm 2 to 2.82 W/cm 2 ) (see Figure ). TCA-enhanced UC devices with increasing PbS thicknesses showed a consistent drop in threshold intensity going from 2.82 W/cm 2 for 5 mg/mL PbS to ~1 W/cm 2 for 50 mg/mL PbS (see Figure SI 9 and SI Table )