Room-temperature direct synthesis of semi-conductive PbS nanocrystal inks for optoelectronic applications

Wang, Yongjie; Liu, Zeke; Huo, Nengjie; Li, Fēi; Gu, Mingxia; Ling, Xufeng; Zhang, Yannan; Lu, Kunyuan; Han, Lu; Fang, Hong‐Hua; Shulga, Artem G.; Xue, Ye; Zhou, Shaoxia; Yang, Fan; Tang, Xun; Zheng, Jiawei; Loi, Maria Antonietta; Konstantatos, Gerasimos; Ma, Wanli

doi:10.1038/s41467-019-13158-6

Cited by 129 publications

(170 citation statements)

References 46 publications

(57 reference statements)

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“…Therefore, a higher carrier collection efficiency is expected, accounting for the higher J SC of the o ‐QD solar cells. Finally, space‐charge‐limited current (SCLC) measurements [ 49 ] confirm that the o ‐QD solids have larger mobility and a lower trap density than the to ‐QD solids, as shown in Figure 7f. As the lead halide treated PbS QD solids exhibit as n‐type semiconductors, [ 12,19 ] the SCLC measurement adopts an electron‐only device structure composed of indium‐doped tin oxide (ITO)/QD film/Ag.…”

Section: Resultsmentioning

confidence: 95%

Facet Control for Trap‐State Suppression in Colloidal Quantum Dot Solids

Xia

Chen

Zhang

et al. 2020

Adv Funct Materials

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Trap states in colloidal quantum dot (QD) solids significantly affect the performance of QD solar cells, because they limit the open-circuit voltage and short circuit current. The {100} facets of PbS QDs are important origins of trap states due to their weak or missing passivation. However, previous investigations focused on synthesis, ligand exchange, or passivation approaches and ignored the control of {100} facets for a given dot size. Herein, trap states are suppressed from the source via facet control of PbS QDs. The {100} facets of ≈3 nm PbS QDs are minimized by tuning the balance between the growth kinetics and thermodynamics in the synthesis. The PbS QDs synthesized at a relatively low temperature with a high oversaturation follow a kinetics-dominated growth, producing nearly octahedral nanoparticles terminated mostly by {111} facets. In contrast, the PbS QDs synthesized at a relatively high temperature follow a thermodynamics-dominated growth. Thus, a spherical shape is preferred, producing truncated octahedral nanoparticles with more {100} facets. Compared to PbS QDs from thermodynamics-dominated growth, the PbS QDs with less {100} facets show fewer trap states in the QD solids, leading to a better photovoltaic device performance with a power conversion efficiency of 11.5%.

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Section: Resultsmentioning

confidence: 95%

Facet Control for Trap‐State Suppression in Colloidal Quantum Dot Solids

Xia

Chen

Zhang

et al. 2020

Adv Funct Materials

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“…It is noteworthy that BTA has been claimed to assist the decomposition of a TU derivative in N,N-dimethylformamide (DMF) during the nucleation and growth of PbS nanocrystals 43 . In the absence of CdCl 2 , Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Room-temperature formation of CdS magic-size clusters in aqueous solutions assisted by primary amines

et al. 2020

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Aqueous-phase approaches to semiconductor CdS magic-size clusters (MSCs) and the formation pathway have remained relatively unexplored. Here, we report the demonstration of an aqueous-phase, room-temperature approach to CdS MSCs, together with an exploration of their evolution pathway. The resulting CdS MSCs display a sharp optical absorption peak at about 360 nm and are labeled MSC-360. With CdCl 2 and thiourea as the respective Cd and S sources, and 3-mercarpotopropionic acid as the ligand, CdS MSC-360 develops in a mixture of a primary amine and water. We argue that the primary amine facilitates roomtemperature decomposition of thiourea when CdCl 2 is present, and the formation pathway of MSCs is similar to that in organic-phase approaches. Our findings show there is a viable avenue to room-temperature aqueous-phase formation of CdS MSCs. Providing explanations of the procedure developed including the formation of large aggregates, the present study represents an important advance towards a mechanistic understanding of nanocrystal synthesis.

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“…Direct synthesis of CQD inks was reported recently, which could simplify the preparation of CQD inks. Wang et al. (2019) used PbI 2 and diphenylthiourea (DPhTA) as the lead source and sulfur source, respectively, accompanied by the injection of BTA into the reaction system.…”

Section: Pbs Cqd Inksmentioning

confidence: 99%

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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Room-temperature direct synthesis of semi-conductive PbS nanocrystal inks for optoelectronic applications

Cited by 129 publications

References 46 publications

Facet Control for Trap‐State Suppression in Colloidal Quantum Dot Solids

Facet Control for Trap‐State Suppression in Colloidal Quantum Dot Solids

Room-temperature formation of CdS magic-size clusters in aqueous solutions assisted by primary amines

PbS Colloidal Quantum Dot Inks for Infrared Solar Cells

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