Journal
NANO ENERGY
Volume 66, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104130
Keywords
CsPbI3 perovskites; Colloidal quantum dots; Solids-state ligand exchange; Sodium acetate; Solar cells
Categories
Funding
- DGIST R&D Programs of the Ministry of Science, ICT & Future Planning of Korea [18-ET-01]
- Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry and Energy of the Republic of Korea [20173010013200]
- Global Frontier R&D Program on Center for Multiscale Energy System Research [2012M3A6A7054856]
- Technology Development Program to Solve Climate Changes [2017M1A2A2087353]
- National Research Foundation under the Ministry of Science and ICT, Republic of Korea [2018R1A2B2006708]
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Fully inorganic CsPbI(3 )perovskite quantum dots (CsPbI3-PQDs) are known as the best-performing photovoltaic absorber in colloidal quantum dot solar cells. This is achieved by improving the cubic-phase-stabilization and electronic-coupling in CsPbI3-PQD solids. In conventional approaches, the hydrolysis of methyl acetate (MeOAc) resulting in acetic acid and methanol as intermediate substances plays a key role in replacing long-chain hydrocarbons with short-chain ligands, which improves charge transport in the CsPbI3-PQD solids. However, CsPbI3-PQDs suffer from lattice distortion and instability under acidic conditions including protons and polar media, leading to CsPbI3-PQD fusion and poor photovoltaic performance. Herein, we report that electronic coupling and photovoltaic performance of CsPbI3-PQD solids are improved by efficient removal of long-chain oleate ligands using a solution of sodium acetate (NaOAc) in MeOAc, which results in the direct generation of OAc ions without forming protons and methanol. NaOAc-based ligand exchange of CsPbI3-PQDs enables preservation of their nanocrystal size without fusion and minimization of surface trap states originating from metal hydroxide formation on their surfaces. Consequently, the best solar cell comprising NaOAc-treated CsPbI3-PQDs shows an improved device performance with a power conversion efficiency (PCE) of 13.3%, as compared with a lead nitrate-treated control device (12.4% PCE).
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