A two-step route to planar perovskite cells exhibiting reduced hysteresis

Alexander H. Ip, Li Na Quan, Michael M. Adachi, Jeffrey J. McDowell, Jixian Xu, Dong Ha Kim, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


A simple two-step method was used to produce efficient planar organolead halide perovskite solar cells. Films produced using solely iodine containing precursors resulted in poor morphology and failed devices, whereas addition of chlorine to the process greatly improved morphology and resulted in dense, uniform perovskite films. This process was used to produce perovskite solar cells with a fullerene-based passivation layer. The hysteresis effect, to which planar perovskite devices are otherwise prone, was greatly suppressed through the use of this interface modifier. The combined techniques resulted in perovskite solar cells having a stable efficiency exceeding 11%. This straightforward fabrication procedure holds promise in development of various optoelectronic applications of planar perovskite films.

Original languageEnglish
Article number4917238
JournalApplied Physics Letters
Issue number14
StatePublished - 6 Apr 2015

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