Microstructure and Near Infrared Absorption of PbS Films Deposited by Chemical Bath Deposition on p-Type Si(100) Wafers

Guo, Ruifang; Liang, Yan; Gao, Xiaoyong; Zhu, He-Jie; Zhang, Sa; Liu, Hongtao

doi:10.1007/s13538-014-0264-0

Cited by 7 publications

(3 citation statements)

References 31 publications

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“…1252.5 nm through 1000.0 nm in wavelength with increase of T rtt . The E opt value is basically consistent with the reported values [26,28]. The film's absorption edge slightly redshifts and then blueshifts with increase in T rtt .…”

Section: Near-infrared Absorptionsupporting

confidence: 91%

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Study on chemical bath-deposited PbS thin films with subsequent rapid thermal treatment: treatment temperature-dependent microstructure and near-infrared absorption

Gao¹,

Guo²,

Li³

2021

Phys. Scr.

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The facile synthesis of high-quality lead sulfide (PbS) thin films is of great significance for PbS-based infrared detectors and photovoltaic application. PbS thin films still need to be greatly improved in crystallization to meet the requirement in performance of the detectors. Rapid thermal treatment is reported to be capable of rapidly improving the crystallization. Thus in this work PbS thin films are firstly synthesized on p-Si(100) substrates in an alkaline chemical bath, and are then subjected to a 20 min rapid thermal treatment. The impact of rapid thermal treatment temperature (T rtt ) is in particular studied on the microstructure and near-infrared absorption of the films. The rapid improvement in crystallization of the films caused by the rapid thermal treatment is also proposed in mechanism. The finding that PbS crystallizes in face-centered cubic structure before the thermal treatment shows the formation of well crystallized PbS in the alkaline chemical bath. The Pb 2+ strongly coordinating with triethanolamine molecules is critical for the formation of PbS. PbS thin films tend to be compact in structure, and to increase and then decrease in particle size with increase in T rtt . The red and blue shifts in near-infrared absorption edge of the films with increase in T rtt are reasonably explained by the change in tensile stress. The transfer of energy in the excited quantumoptical process results in the rapid improvement in crystallization of the films.

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Section: Near-infrared Absorptionsupporting

confidence: 91%

“…The finding shows that the absorption edge of the films lies near the certain wavelength. The precise absorption edge can be estimated using the formula (10) [26,27].…”

Section: Near-infrared Absorptionmentioning

confidence: 99%

Study on chemical bath-deposited PbS thin films with subsequent rapid thermal treatment: treatment temperature-dependent microstructure and near-infrared absorption

Gao¹,

Guo²,

Li³

2021

Phys. Scr.

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“…Considering the direct energy gap of PbS films, we can fit the near-infrared optical absorption edge by using the equation (2) [22,23]. (…”

Section: Optical Propertiesmentioning

confidence: 99%

Impact of Al³⁺ incorporation on microstructural pattern, optical and electrical behaviors of PbS:Al³⁺ films from an alkaline chemical bath

Gao¹,

Guo²,

Li³

2021

Phys. Scr.

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The great improvement in electrical conduction of PbS films is still critical for the application of PbS-infrared detectors and solar cells so far. The incorporation of certain ions to PbS is proved effective for the improvement in electrical conduction. Herein a series of face-centered cubic Al3+-incorporated PbS (PbS:Al3+) films with improved electrical conduction are synthesized on p-type Si(100) substrates from an alkaline chemical bath. The impact of Al3+ molar concentration (CAl) is intensively studied on the microstructural pattern, optical and electrical behaviors of the films. The mechanism of the formation of highly crystallized PbS:Al3+ in alkaline chemical bath is also proposed. All the PbS:Al3+ films are slightly rich in Pb. The strong coordination between Pb2+ and organic triethanolamine molecules plays a key role in the formation of highly crystallized PbS:Al3+. The incorporated Al3+ weakens and even destroys the preferred 〈200〉 orientation of the films due to the enhanced crystal lattice distortion. The film’s resistivity is firstly reduced and then increased with increase in CAl, and the near-infrared optical absorption edge slightly blueshifts and then redshifts. The change in resistivity with increase in CAl can be explained by the substitution of Pb2+ by Al3+ and the change in crystallite size, and the slight blue and red shift in optical edge with increase of CAl is mainly attributed to the increase and the decrease in tensile stress of the films caused by the Al3+ incorporation into PbS, respectively.

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Excessive Increase in the Optical Band Gap of Near‐Infrared Semiconductor Lead (II) Sulfide via the Incorporation of Amino Acids

Lang

Brif

Polishchuk

et al. 2022

Advanced Optical Materials

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Incorporation of organic molecules into the crystal lattice of biominerals is one of Nature's main strategies to modify the structure, morphology, and specific physical properties of the mineral host. Inspired by this biostrategy, it is shown that several semiconductors, whose band gaps are in the ultraviolet or visible absorption spectrum, can incorporate individual amino acids (AAs) into their crystalline structures. Interestingly, such incorporation is accompanied by an increase in the optical band gap of semiconductor hosts, resulting from an internal quantum confinement effect. In this work, this bioinspired route of band gap tuning is applied for the first time to a semiconductor with a near‐infrared (NIR) band gap. Indeed individual AAs are found to become incorporated into the crystalline structure of lead (II) sulfide (PbS). It is shown that this incorporation induces an expansion of the PbS unit cell as well as changes in the morphology. Moreover, an unprecedented increase of up to 40–50% in the optical band gap is observed in the case of cysteine and lysine incorporation.

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Microstructure and Near Infrared Absorption of PbS Films Deposited by Chemical Bath Deposition on p-Type Si(100) Wafers

Abstract: How to citeComplete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative

Cited by 7 publications

References 31 publications

Study on chemical bath-deposited PbS thin films with subsequent rapid thermal treatment: treatment temperature-dependent microstructure and near-infrared absorption

Study on chemical bath-deposited PbS thin films with subsequent rapid thermal treatment: treatment temperature-dependent microstructure and near-infrared absorption

Impact of Al³⁺ incorporation on microstructural pattern, optical and electrical behaviors of PbS:Al³⁺ films from an alkaline chemical bath

Excessive Increase in the Optical Band Gap of Near‐Infrared Semiconductor Lead (II) Sulfide via the Incorporation of Amino Acids

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Microstructure and Near Infrared Absorption of PbS Films Deposited by Chemical Bath Deposition on p-Type Si(100) Wafers

Abstract: How to citeComplete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative

Cited by 7 publications

References 31 publications

Study on chemical bath-deposited PbS thin films with subsequent rapid thermal treatment: treatment temperature-dependent microstructure and near-infrared absorption

Study on chemical bath-deposited PbS thin films with subsequent rapid thermal treatment: treatment temperature-dependent microstructure and near-infrared absorption

Impact of Al3+ incorporation on microstructural pattern, optical and electrical behaviors of PbS:Al3+ films from an alkaline chemical bath

Excessive Increase in the Optical Band Gap of Near‐Infrared Semiconductor Lead (II) Sulfide via the Incorporation of Amino Acids

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Impact of Al³⁺ incorporation on microstructural pattern, optical and electrical behaviors of PbS:Al³⁺ films from an alkaline chemical bath