Efficient, stable and scalable perovskite solar cells

Abstract

Power conversion efficiencies (PCE) of perovskite solar cells (PSCs) has rising from the initial 3.8% to the state-of-the-art 25.5% within the past few years. Most highly efficient PSCs utilize an n-type layer of mesoporous titanium dioxide or tin oxide in an n-i-p device configuration, in which organic conductors are widely used to transport holes into an adjoined metal. Thus far, a variety of efforts have been devoted to achieve a defect-less perovskite film with high-quality morphologies for realizing reduced loss-in-potential outcomes and enhanced efficiency levels. In this talk, we will discuss several challenges that need to be addressed in improving the photovoltaic performance and enhancing the stability of the perovskite solar cells, i.e. (1) preparation of high crystalline film of (FAPbI3)1-x(MAPbBr3)x with controlled carrier mobility and light harvesting, (2) development of selective charge-transporting layers (CTL) with physically and electrically tuned property, (3) interfacial control between the perovskite and the CTLs for reducing the surface defect and preventing the interfacial recombination, and (4), new hole-transporting materials for device stability. Finally, our recent works on scale-up of PSCs will be discussed; 20.7%-efficient flexible cells and large-area sub-modules. Our strategy as presented in this work will offer new directions for those involved in the fabrication of highly efficient, stable and scalable PSCs.