Diffusion engineering of ions and charge carriers for stable efficient perovskite solar cells

Abstract

Long-term stability is crucial for the future application of perovskite solar cells, a promising low-cost photovoltaic technology that has rapidly advanced in the recent years. Here, we designed a nanostructured carbon layer to suppress the diffusion of ions/molecules within perovskite solar cells, an important degradation process in the device. Furthermore, this nanocarbon layer benefited the diffusion of electron charge carriers to enable a high-energy conversion efficiency. Finally, the efficiency on a perovskite solar cell with an aperture area of 1.02 cm2, after a thermal aging test at 85 °C for over 500 h, or light soaking for 1,000 h, was stable of over 15% during the entire test. The present diffusion engineering of ions/molecules and photo generated charges paves a way to realizing long-term stable and highly efficient perovskite solar cells.

Ligand‐Free, Highly Dispersed NiOx Nanocrystal for Efficient, Stable, Low‐Temperature Processable Perovskite Solar Cells

“…Perovskite solar cells (PSCs) have attracted much attention as next‐generation photovoltaic devices because of their high power conversion efficiency (PCE) and low fabrication cost . Several structures for these devices have been proposed, with the two most typical being the conventional n‐i‐p and the inverted p‐i‐n configurations . Although PSCs with a conventional configuration consisting of an n‐type TiO 2 semiconductor capped with a perovskite absorber and a hole‐transporting layer have the highest efficiencies (above 22%), inverted planar PSCs are attractive because of their simple fabrication process, high stability, and low hysteresis .…”

Reveal the growth mechanism in perovskite films via weakly coordinating solvent annealing

“…. . [55,56]. Although the stability of CsPbI 3 films were improved by IPA-SA process, the PCE of CsPbI 3 PSC decreased very quickly.…”

Metal halide perovskite nanocrystals and their applications in optoelectronic devices

“…For solar cells, ion migration causes a notorious photocurrent hysteresis problem. Photocurrent hysteresis brings difficulties in accurately characterizing device efficiency and affects solar cell stability . The structure of the device is modified and passivated to change the work function of different functional layers, which balance the carrier transmission and reduce the interface loss, so as to improve the stability and efficiency of the device .…”