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Grega MN, Gan J, Noman M, Asbury JB. Reversible Ligand Detachment from CdSe Quantum Dots Following Photoexcitation. J Phys Chem Lett 2024; 15:3987-3995. [PMID: 38573308 DOI: 10.1021/acs.jpclett.4c00529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
The nanocrystal-ligand boundaries of colloidal quantum dots (QDs) mediate charge and energy transfer processes that underpin photochemical and photocatalytic transformations at their surfaces. We used time-resolved infrared spectroscopy combined with transient electronic spectroscopy to probe vibrational modes of the carboxylate anchoring groups of stearate ligands attached to cadmium selenide (CdSe) QDs that were optically excited in solid nanocrystal films. The vibrational frequencies of surface-bonded carboxylate groups revealed their interactions with surface-localized holes in the excited states of the QDs. We also observed transient and reversible photoinduced ligand detachment from CdSe nanocrystals within their excited state lifetime. By probing both surface charge distributions and ligand dynamics on QDs in their excited states, we open a pathway to explore how the nanocrystal-ligand boundary can be understood and controlled for the design of QD architectures that most effectively drive charge transfer processes in solar energy harvesting and photoredox catalysis applications.
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Affiliation(s)
- McKenna N Grega
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Jianing Gan
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Muhammad Noman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - John B Asbury
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Intercollege Materials Science and Engineering Program, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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Ye J, Byranvand MM, Martínez CO, Hoye RLZ, Saliba M, Polavarapu L. Defect Passivation in Lead-Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar Cells. Angew Chem Int Ed Engl 2021; 60:21636-21660. [PMID: 33730428 PMCID: PMC8518834 DOI: 10.1002/anie.202102360] [Citation(s) in RCA: 88] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Indexed: 11/16/2022]
Abstract
Lead-halide perovskites (LHPs), in the form of both colloidal nanocrystals (NCs) and thin films, have emerged over the past decade as leading candidates for next-generation, efficient light-emitting diodes (LEDs) and solar cells. Owing to their high photoluminescence quantum yields (PLQYs), LHPs efficiently convert injected charge carriers into light and vice versa. However, despite the defect-tolerance of LHPs, defects at the surface of colloidal NCs and grain boundaries in thin films play a critical role in charge-carrier transport and nonradiative recombination, which lowers the PLQYs, device efficiency, and stability. Therefore, understanding the defects that play a key role in limiting performance, and developing effective passivation routes are critical for achieving advances in performance. This Review presents the current understanding of defects in halide perovskites and their influence on the optical and charge-carrier transport properties. Passivation strategies toward improving the efficiencies of perovskite-based LEDs and solar cells are also discussed.
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Affiliation(s)
- Junzhi Ye
- Cavendish LaboratoryUniversity of Cambridge19, JJ Thomson AvenueCambridgeCB3 0HEUK
| | - Mahdi Malekshahi Byranvand
- Institute for Photovoltaics (ipv)University of StuttgartPfaffenwaldring 4770569StuttgartGermany
- Helmholtz Young Investigator Group FRONTRUNNERIEK5-PhotovoltaikForschungszentrum Jülich52425JülichGermany
| | - Clara Otero Martínez
- CINBIOUniversidade de VigoMaterials Chemistry and Physics GroupDepartment of Physical ChemistryCampus Universitario Lagoas, Marcosende36310VigoSpain
| | - Robert L. Z. Hoye
- Department of MaterialsImperial College LondonExhibition RoadLondonSW7 2AZUK
| | - Michael Saliba
- Institute for Photovoltaics (ipv)University of StuttgartPfaffenwaldring 4770569StuttgartGermany
- Helmholtz Young Investigator Group FRONTRUNNERIEK5-PhotovoltaikForschungszentrum Jülich52425JülichGermany
| | - Lakshminarayana Polavarapu
- CINBIOUniversidade de VigoMaterials Chemistry and Physics GroupDepartment of Physical ChemistryCampus Universitario Lagoas, Marcosende36310VigoSpain
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Cheng Y, Wan H, Liang T, Liu C, Wu M, Hong H, Liu K, Shen H. Continuously Graded Quantum Dots: Synthesis, Applications in Quantum Dot Light-Emitting Diodes, and Perspectives. J Phys Chem Lett 2021; 12:5967-5978. [PMID: 34160222 DOI: 10.1021/acs.jpclett.1c01554] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Colloidal quantum dot (QD) light-emitting diodes (QLEDs) hold the promise of next-generation displays and illumination owing to their excellent color saturation, high efficiency, and solution processability. For achieving high-performance light-emitting diodes (LEDs), engineering the fine compositions and structures of QDs is of paramount importance and attracts tremendous research interest. The recently developed continuously graded QDs (cg-QDs) with gradually altered nanocompositions and electronic band structures present the most advanced example in this area. In this Perspective, we summarize the current progress in LEDs based on cg-QDs, mainly concentrating on their synthesis and advantages in addressing the great challenges in QLEDs, like efficiency roll-off at high current densities, short operation lifetimes at high brightness, and low brightness near the voltage around the bandgap. In addition, we propose accessible approaches exploiting the cutting-edge mechanisms and techniques to further optimize and improve the performance of QLEDs.
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Affiliation(s)
- Yang Cheng
- State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- Key Laboratory for Special Functional Materials, Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng 475004, China
| | - Haoyue Wan
- State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Tianyu Liang
- State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Can Liu
- State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Muhong Wu
- International Center for Quantum Materials, Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China
- Songshan Lake Laboratory for Materials Science, Dongguan 523808, China
- Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China
| | - Hao Hong
- State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
| | - Kaihui Liu
- State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
- International Center for Quantum Materials, Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China
| | - Huaibin Shen
- Key Laboratory for Special Functional Materials, Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng 475004, China
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Ye J, Byranvand MM, Martínez CO, Hoye RLZ, Saliba M, Polavarapu L. Defect Passivation in Lead‐Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar Cells. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102360] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Junzhi Ye
- Cavendish Laboratory University of Cambridge 19, JJ Thomson Avenue Cambridge CB3 0HE UK
| | - Mahdi Malekshahi Byranvand
- Institute for Photovoltaics (ipv) University of Stuttgart Pfaffenwaldring 47 70569 Stuttgart Germany
- Helmholtz Young Investigator Group FRONTRUNNER IEK5-Photovoltaik Forschungszentrum Jülich 52425 Jülich Germany
| | - Clara Otero Martínez
- CINBIO Universidade de Vigo Materials Chemistry and Physics Group Department of Physical Chemistry Campus Universitario Lagoas, Marcosende 36310 Vigo Spain
| | - Robert L. Z. Hoye
- Department of Materials Imperial College London Exhibition Road London SW7 2AZ UK
| | - Michael Saliba
- Institute for Photovoltaics (ipv) University of Stuttgart Pfaffenwaldring 47 70569 Stuttgart Germany
- Helmholtz Young Investigator Group FRONTRUNNER IEK5-Photovoltaik Forschungszentrum Jülich 52425 Jülich Germany
| | - Lakshminarayana Polavarapu
- CINBIO Universidade de Vigo Materials Chemistry and Physics Group Department of Physical Chemistry Campus Universitario Lagoas, Marcosende 36310 Vigo Spain
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Moroz P, Boddy A, Zamkov M. Challenges and Prospects of Photocatalytic Applications Utilizing Semiconductor Nanocrystals. Front Chem 2018; 6:353. [PMID: 30159309 PMCID: PMC6103974 DOI: 10.3389/fchem.2018.00353] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 07/25/2018] [Indexed: 12/25/2022] Open
Abstract
Photocatalytic systems based on colloidal semiconductor nanocrystals have gained considerable attention owing to potential benefits that include a visible-range light extinction and a low spatial overlap of photoinduced charges. When coupled to metal catalysts, nanocrystal sensitizers have demonstrated a compelling performance in homogenous photoreduction reactions, including the degradation of organic dyes and hydrogen generation. Going beyond half-cycle reactions, however, the progress in the field of nanocrystal photocatalysis has been rather limited. Here, we review some of the challenges associated with photocatalytic applications of colloidal semiconductor nanocrystals and highlight possible directions aimed toward their resolution. A particular emphasis was made on new paradigms in this field, including the possibility of harvesting triplet excitons and utilizing nanocrystal assemblies to accumulate multiple charges at the reaction site.
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Affiliation(s)
- Pavel Moroz
- The Center for Photochemical Sciences, Bowling Green State University Bowling Green, OH, United States.,Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH, United States
| | - Anthony Boddy
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, United States
| | - Mikhail Zamkov
- The Center for Photochemical Sciences, Bowling Green State University Bowling Green, OH, United States.,Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH, United States
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