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Improved size distribution of AgBiS2 colloidal nanocrystals by optimized synthetic route enhances photovoltaic performance

Title
Improved size distribution of AgBiS2 colloidal nanocrystals by optimized synthetic route enhances photovoltaic performance
Authors
Oh, Jae TaekCho, H.Bae, Sung YongLim, Sung JunKang, J.Jung, I.H.Choi, H.Kim, Younghoon
DGIST Authors
Lim, Sung JunKim, Younghoon
Issue Date
2020-10
Citation
International Journal of Energy Research, 44(13), 11006-11014
Type
Article
Article Type
Article
Author Keywords
colloidal nanocrystalenvironmentally-friendlyphotovoltaic devicesilver bismuth sulfidesize distribution
Keywords
II-VIQUANTUMGROWTHPHOTODETECTORS
ISSN
0363-907X
Abstract
Ternary silver bismuth sulfide (AgBiS2) colloidal nanocrystals (NCs) have been recognized as a photovoltaic absorber for environmentally-friendly and low-temperature-processed thin film solar cells. However, previous synthetic methods involving hot injection of sulfur precursors into metal oleate precursor solutions do not provide a balance between nucleation and growth, leading to AgBiS2 NCs with broad size distributions. Here, we demonstrate the modified synthetic route that size distribution of AgBiS2 NCs can be improved by pre-adding the non-coordinating 1-octadecene (ODE) solvent into metal precursor solutions, leading to controlled concentration of coordinating oleic acid with improved hot-injection synthetic conditions. The addition of ODE as a non-coordinating solvent to metal precursor/oleic acid solution significantly suppresses variations in the concentration of coordinating oleic acid after injection of the sulfur precursor solution, leading to a homogenous reaction between the metal and sulfur precursors. For photovoltaic devices fabricated using the resultant AgBiS2 NCs, the champion device shows power conversion efficiency (PCE) of 5.94% with an open-circuit voltage (VOC) of 0.52 V. This performance is better than that a control device (PCE of 5.50% and VOC of 0.49 V) because of the reduced energetic disorder and band tail broadening originating from the uniformly-sized AgBiS2 NCs. © 2020 John Wiley & Sons Ltd
URI
http://hdl.handle.net/20.500.11750/12759
DOI
10.1002/er.5695
Publisher
John Wiley and Sons Ltd
Related Researcher
Files:
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Collection:
Division of Nanotechnology1. Journal Articles
Division of Energy Technology1. Journal Articles


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