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Photoelectrochemical (PEC) CO₂reduction (PEC CO₂R) is a prospective approach for utilizing solar energy to synthesize a variety of carbon-containing chemicals and fuels, the most valuable of which are multicarbon (C₂₊) products, such as ethylene and ethanol. While these products can be produced with high faradaic efficiency using Cu, this occurs over a relatively narrow potential range, which, in turn, imposes constraints on the design of a device for PEC CO₂R. Herein, we used continuum-scale modeling to simulate the solar-to-C₂₊(STC₂₊) efficiency of PEC CO₂R devices fed with CO₂-saturated, 0.1 M CsHCO₃. We then explored how cell architecture and the use of single or dual photoelectrode(s) alters the optimal combination of photoelectrode bandgaps for high STC₂₊efficiency. Ultimately, this work provides guidance for the co-design of the device architecture and photoelectrode bandgaps required to achieve high STC₂₊efficiency. The insights gained are then used to identify systems that yield the highest amount of C₂₊products throughout the day and year.