Ultrathin Cu2O as an efficient inorganic hole transporting material for perovskite solar cells

Weili Yu, Feng Li, Hong Wang, Erkki Alarousu, Yin Chen, Lin Bin, Lingfei Wang, Mohamed N. Hedhili, Yangyang Li, Kewei Wu, Xianbin Wang, Omar F. Mohammed, Tao Wu

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

We demonstrate that ultrathin P-type Cu2O thin films fabricated by a facile thermal oxidation method can serve as a promising hole-transporting material in perovskite solar cells. Following a two-step method, inorganic-organic hybrid perovskite solar cells were fabricated and a power conversion efficiency of 11.0% was achieved. We find that the thickness and properties of Cu2O layers must be precisely tuned in order to achieve the optimal solar cell performance. The good performance of such perovskite solar cells can be attributed to the unique properties of ultrathin Cu2O, including high hole mobility, good energy level alignment with CH3NH3PbI3, and longer lifetime of photo-excited carriers. Combining merits of low cost, facile synthesis, and high device performance, ultrathin Cu2O films fabricated via thermal oxidation hold promise for facilitating the developments of industrial-scale perovskite solar cells.
Original languageEnglish (US)
Pages (from-to)6173-6179
Number of pages7
JournalNanoscale
Volume8
Issue number11
DOIs
StatePublished - 2016

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