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Title: Electronic Properties, Screening, and Efficient Carrier Transport in NaSbS 2

Journal Article · · Physical Review Applied
 [1];  [1]
  1. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy

NaSbS2 is a semiconductor that was recently shown to have remarkable efficacy as a solar absorber indicating efficient charge collection even in material containing defects. We report first-principles calculations of properties that show (1) an indirect gap only slightly smaller than the direct gap, which may impede the recombination of photoexcited carriers, (2) highly anisotropic electronic and optical properties reflecting a layered crystal structure, (3) a pushed-up valence-band maximum due to repulsion from the Sb 5s states, and (4) cross-gap hybridization between the S p—derived valence bands and the Sb 5p states. This latter feature leads to enhanced Born effective charges that can provide local screening and, therefore, defect tolerance. Finally, these features are discussed in relation to the performance of the compound as a semiconductor with efficient charge collection.

Research Organization:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0014607
OSTI ID:
1399791
Alternate ID(s):
OSTI ID: 1343637
Journal Information:
Physical Review Applied, Vol. 7, Issue 2; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (9)

Cubic NaSbS 2 as an Ionic–Electronic Coupled Semiconductor for Switchable Photovoltaic and Neuromorphic Device Applications journal November 2019
Pb 5 Sb 8 S 17 quantum dot-sensitized solar cells with an efficiency of 6% under 0.05 sun: Theoretical and experimental studies journal November 2017
Bismuth and antimony-based oxyhalides and chalcohalides as potential optoelectronic materials journal March 2018
An experimental and theoretical study into NaSbS 2 as an emerging solar absorber journal January 2019
Sodium bismuth dichalcogenides: candidates for ferroelectric high-mobility semiconductors for multifunctional applications journal January 2019
NaSbSe 2 as a promising light-absorber semiconductor in solar cells: First-principles insights journal August 2019
Thermoelectric properties of layered NaSbSe 2 journal May 2018
Optical and electronic properties of doped p -type CuI: Explanation of transparent conductivity from first principles journal March 2018
Optical and Electronic Properties of Doped $p$-type CuI: Explanation of Transparent Conductivity from First Principles text January 2018