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Title: Mechanistic origins of excitonic properties in 2D perovskites: Implications for exciton engineering

Journal Article · · Matter (Online)
ORCiD logo [1];  [2];  [3];  [4];  [2];  [1];  [1];  [1];  [4];  [4];  [4]; ORCiD logo [5];  [6];  [2];  [4];  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Brigham Young Univ., Provo, UT (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  4. Brigham Young Univ., Provo, UT (United States)
  5. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  6. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

As the field of 2D halide perovskites (HPs) matures, state-of-the-art techniques to measure important properties, such as the band gap (Eg) and exciton binding energy (Eb), continue to produce inconsistent values. Here, we tackle this long-standing problem by obtaining direct measurements of Eg and Eb for 31 unique HP structures. The Eb values are lower than in previous literature reports and lower than expected from standard theory that assumes excitons are screened by optical-frequency dielectric constants. These low Eb values are shown to be a consequence of unique screening effects, such as superlattice screening and phonon screening. Here, we find a strikingly strong correlation between Eb and Eg and provide design principles to a priori tune Eg and Eb to their optimal values. As such, this work offers a blueprint for Eg-Eb engineering of low-dimensional semiconductors as an even more useful replacement for simply band-gap engineering.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC36-08GO28308; SC0019041; 89233218CNA000001
OSTI ID:
2001120
Report Number(s):
NREL/JA--5900-87580; MainId:88355; UUID:2296defc-bb65-49ad-8e9f-d2739d348844; MainAdminID:70689
Journal Information:
Matter (Online), Journal Name: Matter (Online) Journal Issue: 10 Vol. 6; ISSN 2590-2385
Publisher:
Cell Press/ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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