Anti-Fatigue Tandem Organic Photovoltaics for Indoor Illumination.

The ability of achieving high efficiency makes tandem organic photovoltaics a competitive technique in potential indoor applications. Except high efficiency, reliable indoor energy supplying also calls for outstanding stability. However, unavoidable instable voltage-supply from circuit control system for indoor light sources like light emitting diodes and incandescent lamps would cause carrier density fluctuating and device fatigue drove by periodic light/dark switching. In this work, the strobing induced fatigue within bulk heterojunction/interconnecting layer interface is firstly revealed and overcome. Based on reliable and effective interfacial doping between conjugated acceptor and metal oxide, the interfacial capacitance that determines the strobing induced fatigue, has been significantly restrained. The imbalance carrier migration and fierce inter-layer accommodating during burn-in stage caused by light strobing are substantially diminished. Benefitted from this method, the stability of tandem device are highly enhanced under strobing indoor illumination and a champion efficiency (35.02%) is obtained. Our method provides a guidance for further material design for interconnecting layer in organic photovoltaics. This article is protected by copyright. All rights reserved.