Novel Series of Quasi-2D Ruddlesden-Popper Perovskites Based on Short-Chained Spacer Cation for Enhanced Photodetection

Ruoting Dong, Changyong Lan, Xiuwen Xu, Xiaoguang Liang, Xiaoying Hu, Dapan Li, Ziyao Zhou, Lei Shu, Senpo Yip, Chun Li, Sai Wing Tsang, Johnny C. Ho

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Quasi two-dimensional (2D) layered organic-inorganic perovskite materials (e.g., (BA)2(MA)n-1PbnI3n+1; BA = butylamine; MA = methylamine) have recently attracted wide attention because of their superior moisture stability as compared with three-dimensional counterparts. Inevitably, hydrophobic yet insulating long-chained organic cations improve the stability at the cost of hindering charge transport, leading to the unsatisfied performance of subsequently fabricated devices. Here, we reported the synthesis of quasi-2D (iBA)2(MA)n-1PbnI3n+1 perovskites, where the relatively pure-phase (iBA)2PbI4 and (iBA)2MA3Pb4I13 films can be obtained. Because of the shorter-branched chain of iBA as compared with that of its linear equivalent (n-butylamine, BA), the resulting (iBA)2(MA)n-1PbnI3n+1 perovskites exhibit much enhanced photodetection properties without sacrificing their excellent stability. Through hot-casting, the optimized (iBA)2(MA)n-1PbnI3n+1 perovskite films with n = 4 give the significantly improved crystallinity, demonstrating the high responsivity of 117.09 mA/W, large on-off ratio of 4.0 × 102, and fast response speed (rise and decay time of 16 and 15 ms, respectively). These figure-of-merits are comparable or even better than those of state-of-the-art quasi-2D perovskite-based photodetectors reported to date. Our work not only paves a practical way for future perovskite photodetector fabrication via modulation of their intrinsic material properties but also provides a direction for further performance enhancement of other perovskite optoelectronics.

Original languageEnglish
Pages (from-to)19019-19026
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number22
DOIs
Publication statusPublished - Jun 6 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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