Resonant Raman scattering in nanocrystalline thin CdS film

Saleem, Muhammad Farooq; Zhang, Hua; Deng, Yi; Wang, DeLiang

doi:10.1002/jrs.5002

Cited by 52 publications

(41 citation statements)

References 37 publications

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“…To get rid of the effect of SLG/FTO/CdS, the XRD pattern of this stacked layer is also involved in Figure 3a for comparison. As shown in Figure 3b, regardless of peak at 304 cm −1 , which corresponds to the first-order longitudinal optical phonon scattering from the h-CdS, [27] the precursor film has Raman peaks at 109, 146, 190, 253, and 280 cm −1 . Hence, regardless of the diffraction peaks of SnO 2 , it is quite obvious that a feeble diffraction peak can be found at 17.6° (signed with green arrow) which is correlated with the (120) plan of Sb 2 S 3 .…”

Section: Growth Of Bandgap Gradient Sb 2 (Sse) 3 Filmmentioning

confidence: 93%

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Wang

Chen

et al. 2018

Adv Elect Materials

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eV), [1][2][3] remarkable absorption coefficient (≈10 5 cm −1 ), [4,5] excellent stability, and low-toxicity component. To promote the power conversion efficiency, many methods have been successfully applied to fabricate Sb 2 (S x ,Se 1-x ) 3 solar cells. For example, the rapid thermal evaporation (RTE) method [6] have been gathered many attentions for the fabrication of Sb 2 Se 3 solar cells. Recently, Tang and co-workers used a novel vapor transport deposition (VTD) way to refresh the recorded efficiency of Sb 2 Se 3 solar cell to 7.6%, [7] which has been made a great progress since Sb 2 Se 3 was successfully achieved a power conversion efficiency (PCE) of 0.03% in 2002. [8] On the other hand, Choi et al. have achieved a PCE of 7.5% [9] for Sb 2 S 3 by chemical bath deposition (CBD). Although the VTD and CBD methods have achieved impressive efficiency over 7%, a number of processing issues arise in these approaches. For example, VTD deposition processes are complex and expensive. While the nonvacuums CBD method also has weaknesses such as (i) the film prepared from CBD method is tend to be amorphous; [8,10] (ii) the Sb 2 S 3 film prepared by CBD method is antimony rich which results in a higher mean coordination number (MCN) than the stoichiometric Sb 2 S 3 . It will make it too rigid to flatten out after the annealing step; [11] (iii) the Sb 2 S 3 film prepared by CBD method inevitably includes impurities such as SbOCl, Sb 2 O 3 , and Sb 2 (SO 3 ) 3 . [12][13][14] Meanwhile, although the crystalline of the film fabricated by RTE or VTD is promising, the compactness of the absorber needs a further improvement. Thus, seeking for an effective and easy-handle nonvacuum approach to improve Sb 2 (S x ,Se 1-x ) 3 thin film solar cells is urgently needed.Since the hydrothermal method is a useful method in thin film preparation, the quality and homogeneity of the film deposited by this method is remarkable, which is expected to be able to solve the problem mentioned above and cut down the cost of fabrication. Liu et al. have taken this method to prepare the Sb 2 S 3 thin films, but there is no device reported. [15] In our previous work, double buffer layer was used to tune the band align and reduce recombination, which has achieved V oc as high as 792 mV based on hydrothermal derived Sb 2 (S x ,Se 1-x ) 3 solar cell. [16] But the thick buffer layer (60 nm TiO 2 + 60 nm CdS) inevitably increases the R s of device and decreases the transmittance as well, both of which will reduce J sc and PCE. Besides, the formation mechanism for Sb 2 S 3 thin films based Antimony sulfide-selenide Sb 2 (S,Se) 3 as a promising absorber material has drawn extensive attention owing to its rewarding photoelectric properties, low toxicity, and earth abundant components. Here, an available and highly effective method, in situ hydrothermal growth accompanied with postselenization, is successfully applied to fabricate Sb 2 (S,Se) 3 solar cells. The rationale for the preparation of Sb 2 S 3 precursors by the hydrothermal method is discussed, and ...

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Section: Growth Of Bandgap Gradient Sb 2 (Sse) 3 Filmmentioning

confidence: 93%

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Wang

Chen

et al. 2018

Adv Elect Materials

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“…The presence of the cubic phase CdS cannot be totally excluded. Hexagonal phase of the wurtzite structured CdS can be identified from the presence of the (101), (103), and (112) diffraction peaks as they only belong to the hexagonal phase of CdS . Impurity phases were not detected in the XRD pattern.…”

Section: Resultsmentioning

confidence: 99%

“…Hexagonal phase of the wurtzite structured CdS can be identified from the presence of the (101), (103), and (112) diffraction peaks as they only belong to the hexagonal phase of CdS. [13,14] Impurity phases were not detected in the XRD pattern. The sharp and narrow XRD peaks are the evidence of good crystalline quality of NWs.…”

Section: Structural and Optical Characterization Of Cds Nwsmentioning

confidence: 99%

Enhanced anharmonic phonon coupling and decay dominated by low‐energy phonons in CdS nanowires

Iqbal

Saeed

et al. 2019

J Raman Spectroscopy

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Low‐energy optical phonons with energy in the order of that of acoustic phonons are readily populated at room temperature, and therefore, they play a key role in thermal, electronic, and thermo‐electric fundamental processes in a solid material. High‐quality crystalline cadmium sulfide (CdS) nanowires with a diameter of several tens of nanometer and a length up to several micrometers (3–5 μm) demonstrate strong exciton–phonon coupling. This strong coupling interaction allows us to observe low‐energy optical phonons and their anharmonic couplings to high‐energy phonon modes. In this study, second and higher order multiphonons related to the E2low phonon were observed in near resonance Raman scattering condition (excitation wavelength of 532 nm). The clear observation of the multiphonon modes makes it possible to study composite phonon anharmonic decay. The experimental results show that low‐energy phonons (both optical and acoustical) dominate anharmonic phonon decay in CdS.

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“…By employing silver plasmonic nanoparticles deposited on glass substrate and by in situ adjusting the CdS band gap through heat treatment, the resonant Raman scattering condition (laser wavelength of 514.5 nm) was fully achieved in nanocrystalline CdS thin films. The authors were able to observe Raman multiphonon and the corresponding high‐order scattering modes due to the much enhanced surface nanoplasmonic electric field . H. Wei et al described the composition, microstructure, and SERS properties of titanium nitride thin films prepared via nitridation of sol‐gel derived titania thin films.…”

Section: Nannomaterialsmentioning

confidence: 99%

“…The authors were able to observe Raman multiphonon and the corresponding high-order scattering modes due to the much enhanced surface nanoplasmonic electric field. [98] H. Wei et al described the composition, microstructure, and SERS properties of titanium nitride thin films prepared via nitridation of sol-gel derived titania thin films. They found that films nitrided at 1000°C had the roughest surface with many hotspots formed, which were favorable for enhancing SERS; and as a result, these thin films exhibited the largest SERS enhancement.…”

Section: Carbon Nanotubes Carbon Materials Graphene Layered Solimentioning

confidence: 99%

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Nafie

2018

J Raman Spectroscopy

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This annual review is an overview of advances in the field of Raman spectroscopy as found in papers published in the previous calendar year in the Journal of Raman Spectroscopy (JRS), as well as in trends over the past decade across journals that have published papers important to the field of Raman spectroscopy. This information is gleaned from statistical data on article counts obtained from the Clarivate Analytic's Web of Science Core Collection by year and by subfield of Raman spectroscopy. Additional information is gleaned from presentations at the XXVI International Conference on Raman Spectroscopy (ICORS 2018) in Jeju Island, Korea in August 2018, and contributions on Raman scattering at SCIX 2018, organized by the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) in Atlanta, Georgia, USA in October 2018. Coverage is also provided for topics from the European Conference on Nonlinear Optical Spetroscopy (ECONOS 2018) held in April in Milan, Italy and GeoRaman 2018 in Catania, Italy in June. Finally, papers published in JRS in 2017 are highlighted and arranged by topics at the frontier of Raman spectroscopy. On the basis of this survey information, it is clear that Raman spectroscopy continues as in recent years as a rapidly expanding field of research across a wide range of novel disciplines and applications that provide sensitive photonic information of matter at the molecular level.

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Resonant Raman scattering in nanocrystalline thin CdS film

Cited by 52 publications

References 37 publications

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Enhanced anharmonic phonon coupling and decay dominated by low‐energy phonons in CdS nanowires

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

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Resonant Raman scattering in nanocrystalline thin CdS film

Cited by 52 publications

References 37 publications

Over 6% Certified Sb2(S,Se)3 Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Over 6% Certified Sb2(S,Se)3 Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Enhanced anharmonic phonon coupling and decay dominated by low‐energy phonons in CdS nanowires

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

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Product

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Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization