Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 49, Pages 22230-22237Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202010440
Keywords
CsPbI3; perovskites; quantum dots; solar cells; surface chemistry
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Funding
- National Key Research and Development Program of China [2016YFA0202402]
- Science and Technology Program of Jiangsu Province [BZ2020011]
- National Natural Science Foundation of China [52073198, 51803144, 61674111]
- Natural Science Foundation of Jiangsu Province of China [BK20170337]
- China Postdoctoral Science Foundation [2019M651942]
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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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 CsPbI(3)QDs display significantly reduced surface states, increased vacancy formation energy, higher photoluminescence quantum yields, and much improved stability. Consequently, the L-PHE passivated CsPbI(3)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.
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