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Title: Influence of π-conjugated cations and halogen substitution on the optoelectronic and excitonic properties of layered hybrid perovskites

Journal Article · · Physical Review Materials
 [1];  [2]; ORCiD logo [3];  [4];  [5]; ORCiD logo [3];  [6]; ORCiD logo [3]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. Rennes (France). ENSCR, INSA Rennes, CNRS, ISCR-UMR
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Rice Univ., Houston, TX (United States)
  5. Univ. Rennes (France). INSA Rennes, CNRS, Inst. FOTON-UMR
  6. Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.; Univ. of Illinois at Urbana-Champaign, IL (United States). National Center for Supercomputing Applications

Low-cost chemical engineering of two-dimensional layered hybrid halide perovskite structures allows for the design of hybrid semiconductor quantum wells with tailored room-temperature excitonic optical absorption, emission, and charge carrier transport properties. Here density functional theory and the Bethe-Salpeter equation are used to predict the electronic structure and optical response of layered perovskites with two representative single-ring conjugated organic spacers, ammonium-propyl-imidazole (API) and 2-phenethylammonium (PEA). The inorganic perovskite quantum well properties are further tuned by analyzing the effect of halogen (X = I, Br, Cl) substitution. We found that visible light absorption occurs primarily within the perovskite layer and that UV light absorption induces partial electron-hole separation between layers. In addition, a strong exciton binding energy and influence on absorption spectrum is found by solving the Bethe-Salpeter equation. Our results suggest that further engineering is necessary beyond the single-ring limit, by introducing more conjugated rings and/or heavier nuclei into the organic spacer. This is a promising future direction to achieve photoinduced charge separation and more generally hybrid heterostructures with attractive optoelectronic properties.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396; CBET-1437230; 0001647-1544; OCI-0725070; ACI-1238993; EERE 0001647-1544
OSTI ID:
1772411
Alternate ID(s):
OSTI ID: 1479608
Report Number(s):
LA-UR-18-22811; TRN: US2208355
Journal Information:
Physical Review Materials, Vol. 2, Issue 10; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Molecular engineering of organic–inorganic hybrid perovskites quantum wells journal November 2019

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