Organic solar windows with full visual aesthetics

Visual aesthetics is a key metric of semi-transparent organic photovoltaics (ST-OPVs) for building-integrated solar windows, yet previous studies have primarily focused on the compromise between efficiency and transparency. In this work, we address the overlooked aspect of full visual aesthetic control of organic solar windows, particularly the bidirectional reflected color for architectural harmony, via designing ST-OPVs with the double-sided ultra-thin Ag/TeO2 transparent electrodes. Such a design facilitates full-spectrum color tunability and covers the whole standard color gamut of CIE coordinates on both surfaces of the device, as achieved simply by adjusting the thickness of each layer. Meanwhile, the resulting devices exhibit neutral transparency (16.6%–27.0%) and competitive efficiency (8.1%–9.2%). Moreover, the device delivers strong capacity for flexible device, and demonstrates flexibility-adaptive coloration and curvature-enhanced aesthetics. Therefore, this work presents an ST-OPV design featuring full visual aesthetics and considerable performance, paving the way for the commercialization of organic solar windows for building- and vehicle-integration.