Alkali acetate-assisted enhanced electronic coupling in CsPb₃ perovskite quantum dot solids for improved photovoltaics
- Authors
- Kim, Jigeon; Koo, Bonkee; Kim, Wook Hyun; Choi, Jongmin; Choi, Changsoon; Lim, Sung Jun; Lee, Jong-Soo; Kim, Dae-Hwan; Ko, Min Jae; Kim, Younghoon
- Issue Date
- Dec-2019
- Publisher
- ELSEVIER
- Keywords
- CsPbI3 perovskites; Colloidal quantum dots; Solids-state ligand exchange; Sodium acetate; Solar cells
- Citation
- NANO ENERGY, v.66, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 66
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32799
- DOI
- 10.1016/j.nanoen.2019.104130
- ISSN
- 2211-2855
- Abstract
- 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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