Overall, the comparisons indicate pvTrace v2.1.sv retains its accuracy against a wide variety of square LSCs, produced and measured in different laboratories. The predicted external photon efficiency is within 1% for most examples and within 7% for all examples. However, several difficulties were encountered in making these simulations, which could explain the deviation between the simulated and experimental efficiencies. The PLQY of many organic dyes, including LR305, decreases with increased concentration due to aggregation, 91 but this effect was not included in the simulation, which may impact the results for LSCs using high LR305 concentration.