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Title: Bandgap Tunable Ternary Cd$$_x$$Sb$$_{2–y}$$S$$_{3−δ}$$ Nanocrystals for Solar Cell Applications

Abstract

We report the synthesis and photovoltaic performance of a new nonstoichiometric ternary metal sulfide alloyed semiconductor—Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ nanocrystals prepared by the two-stage sequential ionic layer adsorption reaction technique. The synthesized Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ nanocrystals retain the orthorhombic structure of the host Sb 2S 3 with Cd substituting a fraction ($x$ = 0–0.15) of the cationic element Sb. The Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ lattice expands relative to the host, Sb 2S 3, with its lattice constant $a$ increasing linearly with Cd content $x$. Optical and external quantum efficiency (EQE) spectra revealed that the bandgap $$E_g$$ of Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ decreased from 1.99 to 1.69 eV (i.e., 625–737 nm) as $x$ increased from 0 to 0.15. Liquid-junction Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ quantum dot-sensitized solar cells were fabricated using the polyiodide electrolyte. The best cell yielded a power conversion efficiency (PCE) of 3.72% with the photovoltaic parameters of $$J_{sc}$$ = 15.97 mA/cm 2, $$V_{oc}$$ = 0.50 V, and FF = 46.6% under 1 sun. The PCE further increased to 4.86%, a respectable value for a new solar material, under a reduced light intensity of 10% sun. The PCE (4.86%) and $$J_{sc}$$ (15.97 mA/cm 2) are significantly larger than that (PCE = 1.8%, $$J_{sc}$$ = 8.55 mA/cm 2) of the Sb 2S 3 host. Electrochemical impedance spectroscopy showed that the ZnSe passivation coating increased the electron lifetime by three times. The EQE spectrum of Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ has a maximal EQE of 82% at $λ$ = 350 nm and covers the spectral range of 300–750 nm, which is significantly broader than that (300–625 nm) of the Sb 2S 3 host. The EQE-integrated current density yields a $$J_{ph}$$ of 11.76 mA/cm 2. The tunable bandgap and a respectable PCE near 5% suggest that Cd$$_x$$Sb$$_{2–y}$$S$$_{3-δ}$$ could be a potential candidate for a solar material.

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. National Chung Hsing Univ., Taichung (Taiwan). Inst. of Nanoscience and Dept. of Physics
  2. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
  3. Feng Chia Univ., Taichung (Taiwan). Dept. of Electronic Engineering
Publication Date:
Research Org.:
National Chung Hsing Univ., Taichung (Taiwan); Univ. of Missouri, Columbia, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Ministry of Science and Technology of the Republic of China (MOST); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1580545
Alternate Identifier(s):
OSTI ID: 1583098; OSTI ID: 1591987
Grant/Contract Number:  
SC0019114; 107-2112-M-005-007
Resource Type:
Published Article
Journal Name:
ACS Omega
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2470-1343
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 42 ENGINEERING; 77 NANOSCIENCE AND NANOTECHNOLOGY; solar energy; semiconductor

Citation Formats

Boon-on, Patsorn, Singh, David J., Shi, Jen-Bin, and Lee, Ming-Way. Bandgap Tunable Ternary Cd$_x$Sb$_{2–y}$S$_{3−δ}$ Nanocrystals for Solar Cell Applications. United States: N. p., 2019. Web. doi:10.1021/acsomega.9b01762.
Boon-on, Patsorn, Singh, David J., Shi, Jen-Bin, & Lee, Ming-Way. Bandgap Tunable Ternary Cd$_x$Sb$_{2–y}$S$_{3−δ}$ Nanocrystals for Solar Cell Applications. United States. doi:10.1021/acsomega.9b01762.
Boon-on, Patsorn, Singh, David J., Shi, Jen-Bin, and Lee, Ming-Way. Fri . "Bandgap Tunable Ternary Cd$_x$Sb$_{2–y}$S$_{3−δ}$ Nanocrystals for Solar Cell Applications". United States. doi:10.1021/acsomega.9b01762.
@article{osti_1580545,
title = {Bandgap Tunable Ternary Cd$_x$Sb$_{2–y}$S$_{3−δ}$ Nanocrystals for Solar Cell Applications},
author = {Boon-on, Patsorn and Singh, David J. and Shi, Jen-Bin and Lee, Ming-Way},
abstractNote = {We report the synthesis and photovoltaic performance of a new nonstoichiometric ternary metal sulfide alloyed semiconductor—Cd$_x$Sb$_{2–y}$S$_{3-δ}$ nanocrystals prepared by the two-stage sequential ionic layer adsorption reaction technique. The synthesized Cd$_x$Sb$_{2–y}$S$_{3-δ}$ nanocrystals retain the orthorhombic structure of the host Sb2S3 with Cd substituting a fraction ($x$ = 0–0.15) of the cationic element Sb. The Cd$_x$Sb$_{2–y}$S$_{3-δ}$ lattice expands relative to the host, Sb2S3, with its lattice constant $a$ increasing linearly with Cd content $x$. Optical and external quantum efficiency (EQE) spectra revealed that the bandgap $E_g$ of Cd$_x$Sb$_{2–y}$S$_{3-δ}$ decreased from 1.99 to 1.69 eV (i.e., 625–737 nm) as $x$ increased from 0 to 0.15. Liquid-junction Cd$_x$Sb$_{2–y}$S$_{3-δ}$ quantum dot-sensitized solar cells were fabricated using the polyiodide electrolyte. The best cell yielded a power conversion efficiency (PCE) of 3.72% with the photovoltaic parameters of $J_{sc}$ = 15.97 mA/cm2, $V_{oc}$ = 0.50 V, and FF = 46.6% under 1 sun. The PCE further increased to 4.86%, a respectable value for a new solar material, under a reduced light intensity of 10% sun. The PCE (4.86%) and $J_{sc}$ (15.97 mA/cm2) are significantly larger than that (PCE = 1.8%, $J_{sc}$ = 8.55 mA/cm2) of the Sb2S3 host. Electrochemical impedance spectroscopy showed that the ZnSe passivation coating increased the electron lifetime by three times. The EQE spectrum of Cd$_x$Sb$_{2–y}$S$_{3-δ}$ has a maximal EQE of 82% at $λ$ = 350 nm and covers the spectral range of 300–750 nm, which is significantly broader than that (300–625 nm) of the Sb2S3 host. The EQE-integrated current density yields a $J_{ph}$ of 11.76 mA/cm2. The tunable bandgap and a respectable PCE near 5% suggest that Cd$_x$Sb$_{2–y}$S$_{3-δ}$ could be a potential candidate for a solar material.},
doi = {10.1021/acsomega.9b01762},
journal = {ACS Omega},
number = 1,
volume = 5,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsomega.9b01762

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