Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics

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

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Author(s)

  • Bin Cheng
  • Ting-You Li
  • Partha Maity
  • Pai-Chun Wei
  • Dennis Nordlund
  • Kang-Ting Ho
  • Der-Hsien Lien
  • Chun-Ho Lin
  • Ru-Ze Liang
  • Xiaohe Miao
  • Idris A. Ajia
  • Jun Yin
  • Dimosthenis Sokaras
  • Ali Javey
  • Iman S. Roqan
  • Omar F. Mohammed

Detail(s)

Original languageEnglish
Article number80
Journal / PublicationCOMMUNICATIONS PHYSICS
Volume1
Online published15 Nov 2018
Publication statusPublished - 2018
Externally publishedYes

Abstract

Two dimensional inorganic–organic hybrid perovskites (2D perovskites) suffer from not only quantum confinement, but also dielectric confinement, hindering their application perspective in devices involving the conversion of an optical input into current. In this report, we theoretically predict that an extremely low exciton binding energy can be achieved in 2D perovskites by using high dielectric-constant organic components. We demonstrate that in (HOCH2CH2NH3)2PbI4, whose organic material has a high dielectric constant of 37, the dielectric confinement is largely reduced, and the exciton binding energy is 20-times smaller than that in conventional 2D perovskites. As a result, the photo-induced excitons can be thermally dissociated efficiently at room temperature, as clearly indicated from femtosecond transient absorption measurements. In addition, the mobility is largely improved due to the strong screening effect on charge impurities. Such low dielectric-confined 2D perovskites show excellent carrier extraction efficiency, and outstanding humidity resistance compared to conventional 2D perovskites.

Citation Format(s)

Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics. / Cheng, Bin; Li, Ting-You; Maity, Partha; Wei, Pai-Chun; Nordlund, Dennis; Ho, Kang-Ting; Lien, Der-Hsien; Lin, Chun-Ho; Liang, Ru-Ze; Miao, Xiaohe; Ajia, Idris A.; Yin, Jun; Sokaras, Dimosthenis; Javey, Ali; Roqan, Iman S.; Mohammed, Omar F.; He, Jr-Hau.

In: COMMUNICATIONS PHYSICS, Vol. 1, 80, 2018.

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