Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 44, Issue 13, Pages 11006-11014Publisher
WILEY
DOI: 10.1002/er.5695
Keywords
colloidal nanocrystal; environmentally-friendly; photovoltaic device; silver bismuth sulfide; size distribution
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Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20173010013200]
- National Research Foundation of Korea [NRF-2018R1C1B6001015]
- DGIST R&D Programs of the Ministry of Science, ICT & Future Planning of Korea [20-ET-08]
- National Research Foundation of Korea [4220200213612] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 AgBiS2NCs with broad size distributions. Here, we demonstrate the modified synthetic route that size distribution of AgBiS2NCs 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 AgBiS2NCs, the champion device shows power conversion efficiency (PCE) of 5.94% with an open-circuit voltage (V-OC) of 0.52 V. This performance is better than that a control device (PCEof 5.50% andV(OC)of 0.49 V) because of the reduced energetic disorder and band tail broadening originating from the uniformly-sized AgBiS2NCs.
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