Ultralow Self-Doping in Two-dimensional Hybrid Perovskite Single Crystals

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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  • Wei Peng
  • Jun Yin
  • Kang-Ting Ho
  • Olivier Ouellette
  • Michele De Bastiani
  • Banavoth Murali
  • Omar El Tall
  • Chao Shen
  • Xiaohe Miao
  • Jun Pan
  • Erkki Alarousu
  • Boon S. Ooi
  • Omar F. Mohammed
  • Edward Sargent
  • Osman M. Bakr


Original languageEnglish
Pages (from-to)4759-4767
Journal / PublicationNano Letters
Issue number8
Online published28 Jun 2017
Publication statusPublished - 9 Aug 2017
Externally publishedYes


Unintentional self-doping in semiconductors through shallow defects is detrimental to optoelectronic device performance. It adversely affects junction properties and it introduces electronic noise. This is especially acute for solution-processed semiconductors, including hybrid perovskites, which are usually high in defects due to rapid crystallization. Here, we uncover extremely low self-doping concentrations in single crystals of the two-dimensional perovskites (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n-1 (n = 1, 2, and 3), over three orders of magnitude lower than those of typical three-dimensional hybrid perovskites, by analyzing their conductivity behavior. We propose that crystallization of hybrid perovskites containing large organic cations suppresses defect formation and thus favors a low self-doping level. To exemplify the benefits of this effect, we demonstrate extraordinarily high light-detectivity (1013 Jones) in (C6H5C2H4NH3)PbI 4·(CH3NH3PbI3)n-1 photoconductors due to the reduced electronic noise, which makes them particularly attractive for the detection of weak light signals. Furthermore, the low self-doping concentration reduces the equilibrium charge carrier concentration in (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n-1, advantageous in the design of p-i-n heterojunction solar cells by optimizing band alignment and promoting carrier depletion in the intrinsic perovskite layer, thereby enhancing charge extraction.

Research Area(s)

  • photodetector, shallow defects, single crystals, Two-dimensional hybrid perovskites, unintentional self-doping

Citation Format(s)

Ultralow Self-Doping in Two-dimensional Hybrid Perovskite Single Crystals. / Peng, Wei; Yin, Jun; Ho, Kang-Ting; Ouellette, Olivier; De Bastiani, Michele; Murali, Banavoth; El Tall, Omar; Shen, Chao; Miao, Xiaohe; Pan, Jun; Alarousu, Erkki; He, Jr-Hau; Ooi, Boon S.; Mohammed, Omar F.; Sargent, Edward; Bakr, Osman M.

In: Nano Letters, Vol. 17, No. 8, 09.08.2017, p. 4759-4767.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal