All-polymer indoor photovoltaics with high open-circuit voltage
Indoor photovoltaic (IPV) cells receive increasing attention because of their promising applications as power sources for devices of Internet of Things ecosystem. Under indoor artificial light illumination with narrow emission spectra, short-circuit current density is limited, and thus IPV efficiency is highly dependent on open-circuit voltage (VOC). However, VOC of various IPV cells, including silicon, III-V semiconductors, dye-sensitized, organic/polymeric, and perovskite photovoltaic cells, is mainly lower than 1 V due to their small optical bandgap. Here, we report the first all-polymer IPVs using a blend of polymer donor and polymer acceptor as the active layer. Owing to the medium bandgap (Eg = 1.93 eV) and proper energy level alignment of the two polymers, the all-polymer IPV cell shows a high power conversion efficiency of 27.4% with an unprecedentedly high VOC of 1.16 V under illumination of fluorescent lamp. This work opens up a research field of all-polymer photovoltaic for indoor light-harvesting applications.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry A HOT Papers