Ion migration in hybrid perovskite solar cells

Abstract

Organometal trihalide perovskite (OTP) solar cells might be the next commercially available thin film solar cells due to its high power conversion efficiency and low fabrication cost, which should be attributed to the fantastic optoelectronic properties of OTP materials. Recent studies disclosed that OTP is actually a kind of soft material with both charge carrier conduction and ionic conduction. Increasing observations indicate that mobile ions impact a lot on the electronic/optoelectric properties of OTP film, which hence have raised substantial related studies already. In this chapter, we will provide critical review about the current understanding of ion migration behaviours in OTP solar cells and discuss its impacts on the photovoltaic device efficiency and stability. Besides, the emerging efforts about suppressing ion migration in perovskite films will be summarized. The purpose of this chapter is to provide a quick and brief introduction of the research progress in the ion migration studies.