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Thin‐film, microscale GaAs solar cells transfer printed into luminescent concentrating waveguides show significantly enhanced power output compared to cells evaluated in isolation. Experimental and numerical simulation results demonstrate that optimized configurations involve a free‐standing waveguide and a diffuse backside reflector, as a way to maximize capture of both waveguided and scattered photons. Such unusual options in engineering design suggest promising additional avenues for the use of luminescent concentration in advanced photovoltaics. [ABSTRACT FROM AUTHOR]

On page 991, Noel C. Giebink, John A. Rogers, and co‐workers exploit microscale, bifacial thin‐film GaAs solar cells embedded in luminescent substrates to double the output power under sunlight. The epitaxial liftoff and transfer printing techniques exhibit a potential for large‐scale module production. Optimal design combines a free‐standing waveguide layer with a diffuse backside reflector, delivering the highest photocurrent for microcells. [ABSTRACT FROM AUTHOR]