High efficiency and stability of perovskite solar cells from π-conjugated 5-(Fmoc-amino) valeric acid modification

Organic-inorganic hybrid perovskite solar cells (PSCs) have gradually occupied an important position in the field of new generation photovoltaic devices after years of development. However, the performance and stability of the device are still the key issues restricting its commercialization, and interface engineering is one of the attractive methods. Here, we applied π-conjugated 5-(Fmoc-amino) valeric acid (Fmoc-5-AVA) to post-treat the perovskite films for preparing high efficient and stable PSCs. The photovoltaic performance and stability of the PSCs are enhanced by spin-coating appropriate concentration of ethyl acetate solution of Fmoc-5-AVA on the perovskite films, which are owing to the passivation reduced defects and trap density. The optimal efficiency of the modified PSC is 21.21%, much higher than the unmodified one (19.05%).