Semitransparent organic solar cells based on the gasochromism of WO3

Semitransparent organic solar cells (ST-OSCs) based on the gasochromism of WO3 are theoretically proposed by capping a WO3 and a Pt layer on the transparent Ag electrode of the devices. Transfer matrix method is used to investigate the effects of the gaschromism of the WO3 layer on the transmission, short-circuit current density (Jsc), and color of the devices. It is revealed that the gaschromism can reduce the average transmission of the device from 33.4 % to 21.5% and a reduction of 35.6% is achieved for the ST-OSC with a 270nm-thick WO3 layer. This occurs because the gaschromism can change the reflection of Ag/WO3/Pt multilayer and improve light absorption in the WO3 layer. The superposed effects of these two factors lead to reduction in light transmission of the device. Meanwhile, the effects of the gaschromism on the Jsc and color coordinates of the devices are relatively small.