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

Journal Article · · Communications Physics
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3];  [1];  [4];  [1];  [1];  [5]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4]; ORCiD logo [2];  [2];  [1]
  1. King Abdullah Univ. of Science and Technology (KAUST), Thuwai (Saudi Arabia). Computer, Electrical, and Mathematical Sciences and Engineering Division
  2. King Abdullah Univ. of Science and Technology (KAUST), Thuwai (Saudi Arabia). KAUST Solar Center, Physical Sciences and Engineering Division
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  4. Univ. of California, Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences
  5. King Abdullah Univ. of Science and Technology (KAUST), Thuwai (Saudi Arabia). Core Lab.
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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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1638985
Journal Information:
Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 1; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Layer-edge device of two-dimensional hybrid perovskites journal December 2018
Fluorinated Low‐Dimensional Ruddlesden–Popper Perovskite Solar Cells with over 17% Power Conversion Efficiency and Improved Stability journal July 2019
Manipulation of Dipolar Polarization at Steady States for a Quasi‐2D Organic–Inorganic Hybrid Perovskite with a Nanorod Network journal November 2019
Development of a triple-cation Ruddlesden–Popper perovskite structure with various morphologies for solar cell applications journal January 2020
Layer-edge device of two-dimensional hybrid perovskites journal December 2018
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