Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient

Choi, Jongmin; Choi, Min‐Jae; Kim, Junghwan; Dinic, Filip; Todorovič, P.; Sun, Bin; Wei, Mingyang; Baek, Se‐Woong; Hoogland, Sjoerd; Arquer, F. Pelayo Garcı́a de; Voznyy, Oleksandr; Sargent, Edward H.

doi:10.1002/adma.201906497

Cited by 51 publications

(75 citation statements)

References 37 publications

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“… Choi et al. (2020a , 2020b) prepared a shielding layer on the CQD surface by introducing KI into the ligand exchange process. For the passivation of CQD with PbI 2 and KI, KI buffer layer protected the underlying S site from O 2 , thereby preventing the oxidation of CQDs.…”

Section: Pbs Cqd Inksmentioning

confidence: 99%

“… (D) Blended CQD inks comprising n-type and p-type CQDs for the fabrication of CQD bulk homojunction films. Adapted with permission from Choi et al (2020a , 2020b) . Copyright (2020) Springer Nature.…”

Section: Pbs Cqd Inksmentioning

confidence: 99%

“…Recently, Choi et al. (2020a , 2020b) adopted a cascade surface modification method to improve the surface passivation of p-type CQDs in the ink system and successfully realized a high-efficiency homojunction device ( Figure 7 D). The steric hindrance of the p-type ligands prevented full surface coverage.…”

Section: Pbs Cqd Inksmentioning

confidence: 99%

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PbS Colloidal Quantum Dot Inks for Infrared Solar Cells

et al. 2020

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Summary Infrared PbS colloidal quantum dot (CQD)-based materials receive significant attention because of its unique properties. The PbS CQD ink that originates from ligand exchange of CQDs is highly potential for efficient and stable infrared CQD solar cells (CQDSCs) using low-temperature solution-phase processing. In this review, we present a comprehensive overview of CQD inks for the development of efficient infrared solar cells, which can effectively harvest the photons from the infrared wavelength region of the solar spectrum, including the importance of infrared absorbers for solar cells, the unique properties of CQDs, ligand-exchange determined CQD inks, and related photovoltaic performance of CQDSCs. Finally, we present a brief conclusion, and the possible challenges and opportunities of the CQD inks are discussed in-depth to further develop highly efficient and stable infrared solar cells.

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Section: Pbs Cqd Inksmentioning

confidence: 99%

Section: Pbs Cqd Inksmentioning

confidence: 99%

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PbS Colloidal Quantum Dot Inks for Infrared Solar Cells

et al. 2020

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“…Oleic acid-capped CQDs were synthesized by a previously published method [22]. The liquid-phase ligand exchange was performed in a vail in air.…”

Section: Liquid-phase Ligand Exchange Pbs Cqd Inkmentioning

confidence: 99%

“…The performance of PbS QD heterojunction solar cells has been steadily improving. High-performing PbS QD-based solar cells have reached power conversion efficiency (PCE) exceeding 13.3% [19], and their long-term stability has also been confirmed [20][21][22].…”

Section: Introductionmentioning

confidence: 97%

Annealing-Temperature Dependent Carrier-Transportation in ZnO/PbS Quantum Dot Solar Cells Fabricated Using Liquid-Phase Ligand Exchange Methods

et al. 2020

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We constructed ZnO/PbS quantum dot (QD) heterojunction solar cells using liquid-phase ligand exchange methods. Colloidal QD solutions deposited on ZnO-dense layers were treated at different temperatures to systematically study how thermal annealing temperature affected carrier transport properties. The surface of the layers became dense and smooth as the temperature approached approximately 80 °C. The morphology of layers became rough for higher temperatures, causing large grain-forming PbS QD aggregation. The number of defect states in the layers indicated a valley-shaped profile with a minimum of 80 °C. This temperature dependence was closely related to the amount of residual n-butylamine complexes in the PbS QD layers and the active layer morphology. The resulting carrier diffusion length obtained on the active layers treated at 80 °C reached approximately 430 nm. The solar cells with a 430-nm-thick active layer produced a power conversion efficiency (PCE) of 11.3%. An even higher PCE is expected in solar cells fabricated under optimal annealing conditions.

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Efficient Infrared Solar Cells Employing Quantum Dot Solids with Strong Inter‐Dot Coupling and Efficient Passivation

Liu

Zhang

et al. 2020

Adv Funct Materials

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Lead chalcogenide quantum dot (QD) infrared (IR) solar cells are promising devices for breaking through the theoretical efficiency limit of single‐junction solar cells by harvesting the low‐energy IR photons that cannot be utilized by common devices. However, the device performance of QD IR photovoltaic is limited by the restrictive relation between open‐circuit voltages (VOC) and short circuit current densities (JSC), caused by the contradiction between surface passivation and electronic coupling of QD solids. Here, a strategy is developed to decouple this restriction via epitaxially coating a thin PbS shell over the PbSe QDs (PbSe/PbS QDs) combined with in situ halide passivation. The strong electronic coupling from the PbSe core gives rise to significant carrier delocalization, which guarantees effective carrier transport. Benefited from the protection of PbS shell and in situ halide passivation, excellent trap‐state control of QDs is eventually achieved after the ligand exchange. By a fine control of the PbS shell thickness, outstanding IR JSC of 6.38 mA cm−2 and IR VOC of 0.347 V are simultaneously achieved under the 1100 nm‐filtered solar illumination, providing a new route to unfreeze the trade‐off between VOC and JSC limited by the photoactive layer with a given bandgap.

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Stabilizing Surface Passivation Enables Stable Operation of Colloidal Quantum Dot Photovoltaic Devices at Maximum Power Point in an Air Ambient

Cited by 51 publications

References 37 publications

PbS Colloidal Quantum Dot Inks for Infrared Solar Cells

PbS Colloidal Quantum Dot Inks for Infrared Solar Cells

Annealing-Temperature Dependent Carrier-Transportation in ZnO/PbS Quantum Dot Solar Cells Fabricated Using Liquid-Phase Ligand Exchange Methods

Efficient Infrared Solar Cells Employing Quantum Dot Solids with Strong Inter‐Dot Coupling and Efficient Passivation

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