In Situ Ligand Bonding Management of CsPbI 3 Perovskite Quantum Dots Enables High‐Performance Photovoltaics and Red Light‐Emitting Diodes
| Autor: | Fangchao Li, Yan Jin, Shuai Yuan, Youyong Li, Zhao-Kui Wang, Jianyu Yuan, Ben Cohen-Kleinstein, Wanli Ma, Cheng Liu, Junwei Shi |
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| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science Passivation 010405 organic chemistry business.industry technology industry and agriculture General Medicine General Chemistry equipment and supplies 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences law.invention Photovoltaics law Quantum dot Optoelectronics Quantum efficiency business Surface states Perovskite (structure) Light-emitting diode |
| Zdroj: | Angewandte Chemie International Edition. 59:22230-22237 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | To fine-tune surface ligands towards high-performance devices, we developed an in situ passivation process for all-inorganic cesium lead iodide (CsPbI3 ) perovskite quantum dots (QDs) by using a bifunctional ligand, L-phenylalanine (L-PHE). Through the addition of this ligand into the precursor solution during synthesis, the in situ treated CsPbI3 QDs display significantly reduced surface states, increased vacancy formation energy, higher photoluminescence quantum yields, and much improved stability. Consequently, the L-PHE passivated CsPbI3 QDs enabled the realization of QD solar cells with an optimal efficiency of 14.62 % and red light-emitting diodes (LEDs) with a highest external quantum efficiency (EQE) of 10.21 %, respectively, demonstrating the great potential of ligand bonding management in improving the optoelectronic properties of solution-processed perovskite QDs. |
| Databáze: | OpenAIRE |
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