Cited 5 time in webofscience Cited 5 time in scopus

Improved Eco-Friendly Photovoltaics Based on Stabilized AgBiS2 Nanocrystal Inks

Title
Improved Eco-Friendly Photovoltaics Based on Stabilized AgBiS2 Nanocrystal Inks
Authors
Bae, Sung YongOh, Jae TaekPark, Jin YoungHa, Su RyongChoi, JongminChoi, HyosungKim, Younghoon
DGIST Authors
Bae, Sung Yong; Oh, Jae Taek; Park, Jin Young; Ha, Su Ryong; Choi, Jongmin; Choi, Hyosung; Kim, Younghoon
Issue Date
2020-12
Citation
Chemistry of Materials, 32(23), 10007-10014
Type
Article
Article Type
Article
Keywords
CIRCUIT VOLTAGE DEFICITDOT SOLAR-CELLSQUANTUM DOTSLIGANDPERFORMANCEMONODISPERSETRANSPORTBEHAVIORFILMS
ISSN
0897-4756
Abstract
AgBiS2 nanocrystals (NCs) have emerged as attractive absorbers in eco-friendly photovoltaics because of their nontoxic components and high absorption coefficient. Native long-chain ligands of AgBiS2 NCs should be replaced with short-chain ligands for their photovoltaics; however, conventional approaches have been performed using solid-state ligand exchange (SSLE), resulting in inhomogeneous NC aggregation, broad bandtail, large trap density, and resultantly low open-circuit voltage (VOC) in devices. Herein, we first report that long-chain ligands of AgBiS2 NCs are replaced with halometallate-based short ligands via solution-phase ligand exchange (SPLE). AgI and BiI3 are used as halometallate sources, and we find that colloidally stable, highly concentrated AgBiS2 NC inks in polar solvents are prepared via SPLE using AgI-based halometallates, enabling one-step-deposition suitable for roll-to-roll process. This leads to higher degree of ligand exchange, sharper bandtail, lower trap density, and resultantly higher VOC in devices compared to conventional SSLE. We also first demonstrate that the photovoltaic performance can be improved by introducing ethanedithiol-exchanged AgBiS2 NCs on SPLE-prepared AgBiS2 NC solids because of favorable band alignment and extended depletion width. Thus, this enables improving device performance up to a power conversion efficiency of 4.08% with the highest VOC of 0.55 V among the AgBiS2 NC photovoltaics reported so far. ©
URI
http://hdl.handle.net/20.500.11750/12768
DOI
10.1021/acs.chemmater.0c03126
Publisher
American Chemical Society
Related Researcher
  • Author Choi, Jongmin Chemical & Energy Materials Engineering (CEME) Laboratory
  • Research Interests Advanced Metal Oxides; Colloidal Quantum Dots; Perovskite-Quantum Dot Hybrid Nanomaterials; Photocatalytic Materials
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles
Division of Energy Technology1. Journal Articles


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