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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)19019-19026
Journal / PublicationACS Applied Materials and Interfaces
Volume10
Issue number22
Online published9 May 2018
Publication statusPublished - 6 Jun 2018

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.

Research Area(s)

  • quasi-2D, Ruddlesden−Popper perovskite, thin film, short-chained spacer, hot-cast, photodetection

Citation Format(s)

Novel Series of Quasi-2D Ruddlesden-Popper Perovskites Based on Short-Chained Spacer Cation for Enhanced Photodetection. / Dong, Ruoting; Lan, Changyong; Xu, Xiuwen; Liang, Xiaoguang; Hu, Xiaoying; Li, Dapan; Zhou, Ziyao; Shu, Lei; Yip, SenPo; Li, Chun; Tsang, Sai-Wing; Ho, Johnny C.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 22, 06.06.2018, p. 19019-19026.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review