Fiber-shaped perovskite solar cells with 5.3% efficiency

Abstract

Nowadays, there is an increasing interest in solid solar cells based on organolead trihalides, which have achieved a certified efficiency of 20.1%. The success in perovskite solar cells extended the knowledge of perovskite materials and inspired their study for special solar architectures. Fiber-shaped solar cells are a type of photovoltaic device fabricated on one-dimensional conductive substrates, which could be potential candidates for wearable/portable electronics. In this study, we integrate the structure of Ti/c-TiO₂/meso-TiO₂/perovskite/spiro-OMeTAD/Au into the fiber format. The fiber-shaped perovskite solar cells achieved a 5.3% PCE under AM 1.5 illumination and an apparent 8.4% efficiency in the diffuse model. The device design required no transparent conductive oxides and a thin film of gold nanoparticles was employed as a semitransparent top electrode. All the processes for device fabrication were easy to handle and energy-saving. The fiber devices exhibited high reproducibility, which could open new doors towards efficient solid fiber shaped photovoltaic cells.