Correction to High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Monolayers

Kim, Gi-Hwan; Arquer, F. Pelayo Garcı́a de; Yoon, Yung Jin; Lan, Xinzheng; Liu, Mengxia; Voznyy, Oleksandr; Jagadamma, Lethy Krishnan; Abbas, Abdullah Saud; Yang, Zhenyu; Fan, Fengjia; Ip, Alexander H.; Kanjanaboos, Pongsakorn; Hoogland, Sjoerd; Amassian, Aram; Kim, Jin Young; Sargent, Edward H.

doi:10.1021/acs.nanolett.5b04797

Cited by 10 publications

(7 citation statements)

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“…Future design of the photodiode will have to include strategies to reduce this barrier for photohole. This might be obtained from a self-assembled monolayer inducing dipole 51 or by using graded band gap CQD layer 52 at this contact. In the photodiode, the transit time, which is the duration for one carrier to cross the structure, is given by L 2 /µV with L the device thickness (250 nm for the PbS layer), µ the carrier mobility and V the applied bias.…”

Section: Resultsmentioning

confidence: 99%

Time-Resolved Photoemission to Unveil Electronic Coupling between Absorbing and Transport Layers in a Quantum Dot-Based Solar Cell

Gréboval

Rastogi

et al. 2020

J. Phys. Chem. C

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Lead sulfide (PbS) colloidal quantum dots-based photodiodes are remarkable structures obtained via colloidal engineering because of their outstanding optoelectronic performances. They combine surface ligand engineering to design a p-n junction with all solution processability. Here we investigate the PbS diode electronic structure combining static and dynamic photoemissions with transport measurements. We show that the n-type nature of the Icapped PbS CQDs shifts the valence band away from the Fermi level compared to the thiol capped nanocrystals. This change in majority carriers can be probed using time resolved X-ray photoemission spectroscopy (TRXPS). We also prove that the photo-induced binding energy shift depends on the nanoparticle surface chemistry. Finally, we demonstrate the ability of TRXPS to selectively probe the electronic structure of each side of an interface. We explore the PbS/MoO3 interface used as hole extractor in the PbS solar cell, using this method. We demonstrate that the PbS layer photosensitizes the MoO3 layer and that the two layers have a quasi-rigid electrostatic coupling. We identify the band bending occurring on the PbS(EDT)/MoO3 to be a limiting factor for the device performance and suggest strategies to overcome this limitation.

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Section: Resultsmentioning

confidence: 99%

Time-Resolved Photoemission to Unveil Electronic Coupling between Absorbing and Transport Layers in a Quantum Dot-Based Solar Cell

Gréboval

Rastogi

et al. 2020

J. Phys. Chem. C

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“…For efficient separation of photogenerated carriers in a heterojunction, a proper band alignment at the interface is a matter of prime importance, because an improper band alignment, such as type I (straddling gap) or type III (broken gap), hampers the charge-separation efficiency. The interfaces with the electrodes need to be energetically optimized for charge collection as well as to act as blocking contact for the other type of carriers …”

mentioning

confidence: 99%

Band Diagram of Heterojunction Solar Cells through Scanning Tunneling Spectroscopy

2017

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The band diagram in heterojunction solar cells is of utmost importance when visualizing the possibility of charge separation and carrier transport. The diagram should in principle be drawn from the viewpoint of the charge carriers in the devices. While considering solar cells based on conjugated organics and/or inorganic compound semiconductors, we have shown in this Perspective that scanning tunneling spectroscopy (STS) can draw appropriate band diagrams, which the carriers would encounter during the separation and transport processes. Moreover, differential conductance (dI/dV) images in scanning tunneling microscopy are capable of energy mapping; one can therefore map domains of the materials in a bulk heterojunction (BHJ). Correlation between morphology of the components in BHJs and device performance can therefore be envisaged through STS.

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“…To overcome CdS, CdSe, CdTe, and PbS QDs are combined to be able to absorb photons with different wavelengths in the visible region. Recently, photoanodes with multilayer QDs, such as CdS/CdSe [ 105 ], CdS/CdTe [ 106 ], CdS/PbS [ 107 ], CdS/CdSe/PbS [ 108 ], CdSe/CdTe [ 109 ], or ZnTe/CdSe [ 110 ], have been studied. Osada et al reported a 70% increasement in PCE of QDSSCs by covering a CdS layer prior to TiO 2 , i.e., CdS acts as a buffer layer, while only 50% enhancement with CdSe prior covering.…”

Section: Qdsscs Based On a Photoanode With Multilayer Qdsmentioning

confidence: 99%

Quantum Dot Sensitized Solar Cell: Photoanodes, Counter Electrodes, and Electrolytes

et al. 2021

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In this study, we provide the reader with an overview of quantum dot application in solar cells to replace dye molecules, where the quantum dots play a key role in photon absorption and excited charge generation in the device. The brief shows the types of quantum dot sensitized solar cells and presents the obtained results of them for each type of cell, and provides the advantages and disadvantages. Lastly, methods are proposed to improve the efficiency performance in the next researching.

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Correction to High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Monolayers

Cited by 10 publications

References 0 publications

Time-Resolved Photoemission to Unveil Electronic Coupling between Absorbing and Transport Layers in a Quantum Dot-Based Solar Cell

Time-Resolved Photoemission to Unveil Electronic Coupling between Absorbing and Transport Layers in a Quantum Dot-Based Solar Cell

Band Diagram of Heterojunction Solar Cells through Scanning Tunneling Spectroscopy

Quantum Dot Sensitized Solar Cell: Photoanodes, Counter Electrodes, and Electrolytes

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