Microcavity Structure Provides High‐Performance (>8.1%) Semitransparent and Colorful Organic Photovoltaics

High‐performance colored aesthetic semitransparent organic photovoltaics (OPVs) featuring a silver/indium tin oxide/silver (Ag/ITO/Ag) microcavity structure are prepared. By precisely controlling the thickness of the ITO layer, OPV devices exhibiting high transparency and a wide and high‐purity color gamut are obtained: blue ( B ), green ( G ), yellow‐green ( YG ), yellow ( Y ), orange ( O ), and red ( R ). The power conversion efficiencies (PCEs) of the G , YG , and Y color devices are greater than 8% (AM 1.5G irradiation, 100 mW cm −2 ) with maximum transmittances ( T MAX ) of greater than 14.5%. An optimized PCE of 8.2% was obtained for the YG OPV [CIE 1931 coordinates: (0.364, 0.542)], with a value of T MAX of 17.3% (at 561 nm). As far as it is known, this performance is the highest ever reported for a transparent colorful OPV. Such high transparency and desired transmitted colors, which can perspective see the clear images, suggest great potential for use in building‐integrated photovoltaic applications.