Research

17 pages, 3213 KiB

Open AccessArticle

Using Dual Microresonant Cavity and Plasmonic Effects to Enhance the Photovoltaic Efficiency of Flexible Polymer Solar Cells

by Wenfei Shen, Guoqing Zhao, Xiaolin Zhang, Fanchen Bu, Jungheum Yun and Jianguo Tang

Nanomaterials 2020, 10(5), 944; https://doi.org/10.3390/nano10050944 - 15 May 2020

Cited by 44 | Viewed by 2880

Abstract

Fabricating polymer solar cells (PSCs) on flexible polymer substrates, instead of on hard glass, is attractive for implementing the advantage and uniqueness of the PSCs represented by mechanically rollable and light-weight natures. However, simultaneously achieving reliable robustness and high-power conversion efficiency (PCE) in [...] Read more.

Fabricating polymer solar cells (PSCs) on flexible polymer substrates, instead of on hard glass, is attractive for implementing the advantage and uniqueness of the PSCs represented by mechanically rollable and light-weight natures. However, simultaneously achieving reliable robustness and high-power conversion efficiency (PCE) in such flexible PSCs is still technically challenging due to poor light harvesting of thin photoactive polymers. In this work, we report a facile, effective strategy for improving the light-harvesting performance of flexible PSCs without sacrificing rollability. Very high transparent (93.67% in 400–800 nm) and low sheet resistance (~10 Ω sq⁻¹) ZnO/Ag_(O)/ZnO electrodes were implemented as the flexible substrates. In systematically comparison with ZnO/Ag/ZnO electrodes, small amount of oxygen induced continuous metallic films with lower thickness, which resulted in higher transmittance and lower sheet resistance. To increase the light absorption of thin active layer (maintain the high rollability of active layer), a unique platform simultaneously utilizing both a transparent electrode configuration based on an ultrathin oxygen-doped Ag, Ag_(O), and film and plasmonic Ag@SiO₂ nanoparticles were designed for fully leveraging the advantages of duel microresonant cavity and plasmonic effects to enhance light absorbance in photoactive polymers. A combination of the ZnO/Ag_(O)/ZnO electrode and Ag@SiO₂ nanoparticles significantly increased the short-current density of PSCs to 17.98 mA cm⁻² with enhancing the photoluminescence of PTB7-Th film. The flexible PSC using the optimized configuration provided an average PCE of 8.04% for flexible PSCs, which was increased by 36.27% compared to that of the PSC merely using a conventional transparent indium tin oxide electrode. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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11 pages, 3098 KiB

Open AccessArticle

Down-Shifting and Anti-Reflection Effect of CsPbBr₃ Quantum Dots/Multicrystalline Silicon Hybrid Structures for Enhanced Photovoltaic Properties

by Yunqing Cao, Dong Wu, Ping Zhu, Dan Shan, Xianghua Zeng and Jun Xu

Nanomaterials 2020, 10(4), 775; https://doi.org/10.3390/nano10040775 - 17 Apr 2020

Cited by 19 | Viewed by 3265

Abstract

Over the past couple of decades, extensive research has been conducted on silicon (Si) based solar cells, whose power conversion efficiency (PCE) still has limitations because of a mismatched solar spectrum. Recently, a down-shifting effect has provided a new way to improve cell [...] Read more.

Over the past couple of decades, extensive research has been conducted on silicon (Si) based solar cells, whose power conversion efficiency (PCE) still has limitations because of a mismatched solar spectrum. Recently, a down-shifting effect has provided a new way to improve cell performances by converting ultraviolet (UV) photons to visible light. In this work, caesium lead bromide perovskite quantum dots (CsPbBr₃ QDs) are synthesized with a uniform size of 10 nm. Exhibiting strong absorption of near UV light and intense photoluminescence (PL) peak at 515 nm, CsPbBr₃ QDs show a potential application of the down-shifting effect. CsPbBr₃ QDs/multicrystalline silicon (mc-Si) hybrid structured solar cells are fabricated and systematically studied. Compared with mc-Si solar cells, CsPbBr₃ QDs/mc-Si solar cells have obvious improvement in external quantum efficiency (EQE) within the wavelength ranges of both 300 to 500 nm and 700 to 1100 nm, which can be attributed to the down-shifting effect and the anti-reflection property of CsPbBr₃ QDs through the formation of CsPbBr₃ QDs/mc-Si structures. Furthermore, a detailed discussion of contact resistance and interface defects is provided. As a result, the coated CsPbBr₃ QDs are optimized to be two layers and the solar cell exhibits a highest PCE of 14.52%. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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16 pages, 3724 KiB

Open AccessArticle

Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se₂ Solar Cell and H₂ Production

by Salh Alhammadi, Vasudeva Reddy Minnam Reddy, Sreedevi Gedi, Hyeonwook Park, Mostafa Saad Sayed, Jae-Jin Shim and Woo Kyoung Kim

Nanomaterials 2020, 10(2), 245; https://doi.org/10.3390/nano10020245 - 30 Jan 2020

Cited by 29 | Viewed by 4109

Abstract

A graphene–cadmium sulfide (Gr–CdS) nanocomposite was prepared by a chemical solution method, and its material properties were characterized by several analysis techniques. The synthesized pure CdS nanoparticles (NPs) and Gr–CdS nanocomposites were confirmed to have a stoichiometric atomic ratio (Cd/S = 1:1). The [...] Read more.

A graphene–cadmium sulfide (Gr–CdS) nanocomposite was prepared by a chemical solution method, and its material properties were characterized by several analysis techniques. The synthesized pure CdS nanoparticles (NPs) and Gr–CdS nanocomposites were confirmed to have a stoichiometric atomic ratio (Cd/S = 1:1). The Cd 3d and S 2p peaks of the Gr–CdS nanocomposite appeared at lower binding energies compared to those of the pure CdS NPs according to X-ray photoelectron spectroscopy analyses. The formation of the Gr–CdS nanocomposite was also evidenced by the structural analysis using Raman spectroscopy and X-ray diffraction. Transmission electron microscopy confirmed that CdS NPs were uniformly distributed on the graphene sheets. The absorption spectra of both the Gr–CdS nanocomposite and pure CdS NPs thin films showed an absorption edge at 550 nm related to the energy band gap of CdS (~2.42 eV). The Cu(In,Ga)Se₂ thin film photovoltaic device with Gr–CdS nanocomposite buffer layer showed a higher electrical conversion efficiency than that with pure CdS NPs thin film buffer layer. In addition, the water splitting efficiency of the Gr–CdS nanocomposite was almost three times higher than that of pure CdS NPs. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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9 pages, 2539 KiB

Open AccessArticle

Preparation of Transparent Conductive Electrode via Layer-By-Layer Deposition of Silver Nanowires and Its Application in Organic Photovoltaic Device

by B. Tugba Camic, Hong In Jeong, M. Hasan Aslan, Arif Kosemen, Seongbeom Kim, Hyosung Choi, Fevzihan Basarir and Bo Ram Lee

Nanomaterials 2020, 10(1), 46; https://doi.org/10.3390/nano10010046 - 24 Dec 2019

Cited by 23 | Viewed by 3860

Abstract

Solution processed transparent conductive electrodes (TCEs) were fabricated via layer-by-layer (LBL) deposition of silver nanowires (AgNWs). First, the AgNWs were coated on (3-Mercaptopropyl)trimethoxysilane modified glass substrates. Then, multilayer AgNW films were obtained by using 1,3-propanedithiol as a linker via LBL deposition, which made [...] Read more.

Solution processed transparent conductive electrodes (TCEs) were fabricated via layer-by-layer (LBL) deposition of silver nanowires (AgNWs). First, the AgNWs were coated on (3-Mercaptopropyl)trimethoxysilane modified glass substrates. Then, multilayer AgNW films were obtained by using 1,3-propanedithiol as a linker via LBL deposition, which made it possible to control the optical transmittance and sheet resistance of multilayer thin films. Next, thermal annealing of AgNW films was performed in order to agent their electrical conductivity. AgNW monolayer films were characterized by UV-Vis spectrometer, field emission scanning electron microscopy, optical microscopy, atomic force microscopy and sheet resistance measurement by four-point probe method. The high performances were achieved with multilayer films, which provided sheet resistances of 9 Ω/sq, 11 Ω/sq with optical transmittances of 71%, 70% at 550 nm, which are comparable to commercial indium tin oxide (ITO) electrodes. Finally, an organic photovoltaic device was fabricated on the AgNW multilayer electrodes for demonstration purpose, which exhibited power conversion efficiency of 1.1%. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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13 pages, 4394 KiB

Open AccessArticle

Aqueous-Based Binary Sulfide Nanoparticle Inks for Cu₂ZnSnS₄ Thin Films Stabilized with Tin(IV) Chalcogenide Complexes

by Han Wang, Amrita Yasin, Nathaniel J. Quitoriano and George P. Demopoulos

Nanomaterials 2019, 9(10), 1382; https://doi.org/10.3390/nano9101382 - 26 Sep 2019

Cited by 5 | Viewed by 2889

Abstract

Cu₂ZnSnS₄ (CZTS) is a promising semiconductor material for photovoltaic applications, with excellent optical and electronic properties while boasting a nontoxic, inexpensive, and abundant elemental composition. Previous high-quality CZTS thin films often required either vacuum-based deposition processes or the use of [...] Read more.

Cu₂ZnSnS₄ (CZTS) is a promising semiconductor material for photovoltaic applications, with excellent optical and electronic properties while boasting a nontoxic, inexpensive, and abundant elemental composition. Previous high-quality CZTS thin films often required either vacuum-based deposition processes or the use of organic ligands/solvents for ink formulation, which are associated with various issues regarding performance or economic feasibility. To address these issues, an alternative method for depositing CZTS thin films using an aqueous-based nanoparticle suspension is demonstrated in this work. Nanoparticles of constituent binary sulfides (Cu_xS and ZnS) are stabilized in an ink using tin(IV)-based, metal chalcogenide complexes such as [Sn₂S₆]⁴⁻. This research paper provides a systematic study of the nanoparticle synthesis and ink formulation via the enabling role of the tin chalcogenide complexing power, the deposition of high-quality CZTS thin films via spin coating and annealing under sulfur vapor atmosphere, their structural characterization in terms of nanocrystal phase, morphology, microstructure, and densification, and their resultant optoelectronic properties. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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13 pages, 5416 KiB

Open AccessArticle

TiO₂ Coated ZnO Nanorods by Mist Chemical Vapor Deposition for Application as Photoanodes for Dye-Sensitized Solar Cells

by Qiang Zhang and Chaoyang Li

Nanomaterials 2019, 9(9), 1339; https://doi.org/10.3390/nano9091339 - 19 Sep 2019

Cited by 34 | Viewed by 4960

Abstract

In this study, a mist chemical vapor deposition method was applied to create a coating of titanium dioxide particles in order to fabricate ZnO/TiO₂ core–shell nanostructures. The thin layers of titanium dioxide on the zinc oxide nanorods were uniform and confirmed as [...] Read more.

In this study, a mist chemical vapor deposition method was applied to create a coating of titanium dioxide particles in order to fabricate ZnO/TiO₂ core–shell nanostructures. The thin layers of titanium dioxide on the zinc oxide nanorods were uniform and confirmed as pure anatase phase. The morphological, structural, optical and photoluminescence properties of the ZnO/TiO₂ core–shell structures were influenced by coating time. For instance, the crystallinity of the titanium dioxide increased in accordance with an increase in the duration of the coating time. Additionally, the thickness of the titanium dioxide layer gradually increased with the coating time, resulting in an increased surface area. The transmittance of the arrayed ZnO/TiO₂ core–shell structures was 65% after 15 min of coating. The obtained ZnO/TiO₂ core–shell nanostructures demonstrated high potentiality to serve as photoanodes for application in dye-sensitized solar cells. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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14 pages, 1841 KiB

Open AccessArticle

Mode Splitting Induced by Mesoscopic Electron Dynamics in Strongly Coupled Metal Nanoparticles on Dielectric Substrates

by Katarzyna Kluczyk-Korch, Lucjan Jacak, Witold Aleksander Jacak and Christin David

Nanomaterials 2019, 9(9), 1206; https://doi.org/10.3390/nano9091206 - 27 Aug 2019

Cited by 4 | Viewed by 2845

Abstract

We study strong optical coupling of metal nanoparticle arrays with dielectric substrates. Based on the Fermi Golden Rule, the particle–substrate coupling is derived in terms of the photon absorption probability assuming a local dipole field. An increase in photocurrent gain is achieved through [...] Read more.

We study strong optical coupling of metal nanoparticle arrays with dielectric substrates. Based on the Fermi Golden Rule, the particle–substrate coupling is derived in terms of the photon absorption probability assuming a local dipole field. An increase in photocurrent gain is achieved through the optical coupling. In addition, we describe light-induced, mesoscopic electron dynamics via the nonlocal hydrodynamic theory of charges. At small nanoparticle size (<20 nm), the impact of this type of spatial dispersion becomes sizable. Both absorption and scattering cross sections of the nanoparticle are significantly increased through the contribution of additional nonlocal modes. We observe a splitting of local optical modes spanning several tenths of nanometers. This is a signature of semi-classical, strong optical coupling via the dynamic Stark effect, known as Autler–Townes splitting. The photocurrent generated in this description is increased by up to 2%, which agrees better with recent experiments than compared to identical classical setups with up to 6%. Both, the expressions derived for the particle–substrate coupling and the additional hydrodynamic equation for electrons are integrated into COMSOL for our simulations. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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12 pages, 3175 KiB

Open AccessArticle

Efficient, Stable, and Low-Cost PbS Quantum Dot Solar Cells with Cr–Ag Electrodes

by Jobeda J. Khanam, Simon Y. Foo, Zhibin Yu, Tianhan Liu and Pengsu Mao

Nanomaterials 2019, 9(9), 1205; https://doi.org/10.3390/nano9091205 - 27 Aug 2019

Cited by 8 | Viewed by 4748

Abstract

PbS quantum dots (QDs) are a promising nanostructured material for solar cells. However, limited works have been done to explore the active layer thickness, layer deposition techniques, stability improvement, and cost reduction for PbS QD solar cells. We address those issues of device [...] Read more.

PbS quantum dots (QDs) are a promising nanostructured material for solar cells. However, limited works have been done to explore the active layer thickness, layer deposition techniques, stability improvement, and cost reduction for PbS QD solar cells. We address those issues of device fabrication herein and suggest their possible solutions. In our work, to get the maximum current density from a PbS QD solar cell, we estimated the optimized active layer thickness using Matlab simulation. After that, we fabricated a high-performance and low-cost QD photovoltaic (PV) device with the simulated optimized active layer thickness. We implemented this low-cost device using a 10 mg/mL PbS concentration. Here, spin coating and drop-cast layer deposition methods were used and compared. We found that the device prepared by the spin coating method was more efficient than that by the drop cast method. The spin-coated PbS QD solar cell provided 6.5% power conversion efficiency (PCE) for the AM1.5 light spectrum. Besides this, we observed that Cr (chromium) interfaced with the Ag (Cr–Ag) electrode can provide a highly air-stable electrode. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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11 pages, 1829 KiB

Open AccessArticle

Using a Neural Network to Improve the Optical Absorption in Halide Perovskite Layers Containing Core-Shells Silver Nanoparticles

by Michael D. Nelson and Marcel Di Vece

Nanomaterials 2019, 9(3), 437; https://doi.org/10.3390/nano9030437 - 15 Mar 2019

Cited by 19 | Viewed by 3976

Abstract

Core-shells metallic nanoparticles have the advantage of possessing two plasmon resonances, one in the visible and one in the infrared part of the spectrum. This special property is used in this work to enhance the efficiency of thin film solar cells by improving [...] Read more.

Core-shells metallic nanoparticles have the advantage of possessing two plasmon resonances, one in the visible and one in the infrared part of the spectrum. This special property is used in this work to enhance the efficiency of thin film solar cells by improving the optical absorption at both wavelength ranges simultaneously by using a neural network. Although many thin-film solar cell compositions can benefit from such a design, in this work, different silver core-shell configurations were explored inside a Halide Perovskite (CH₃NH₃PbI₃) thin film. Because the number of potential configurations is infinite, only a limited number of finite difference time domain (FDTD) simulations were performed. A neural network was then trained with the simulation results to find the core-shells configurations with optimal optical absorption across different wavelength ranges. This demonstrates that core-shells nanoparticles can make an important contribution to improving solar cell performance and that neural networks can be used to find optimal results in such nanophotonic systems. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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4 pages, 5564 KiB

Open AccessArticle

CuInTe₂ Nanocrystals: Shape and Size Control, Formation Mechanism and Application, and Use as Photovoltaics

by Guanwei Jia, Baokun Liu, Kun Wang, Chengduo Wang, Peixu Yang, Jinhui Liu, Weidong Zhang, Rongbin Li, Shaojun Zhang and Jiang Du

Nanomaterials 2019, 9(3), 409; https://doi.org/10.3390/nano9030409 - 11 Mar 2019

Cited by 10 | Viewed by 3789

Abstract

We report on the synthesis of CuInTe₂ nanoparticles and their function in photovoltaic equipment, such as solar cells. Under certain synthesis conditions, the CuInTe₂ nanocrystals form shape with nanocrystals, nanorods or nanocubes. It was found that CuTe nanocrystals could be converted [...] Read more.

We report on the synthesis of CuInTe₂ nanoparticles and their function in photovoltaic equipment, such as solar cells. Under certain synthesis conditions, the CuInTe₂ nanocrystals form shape with nanocrystals, nanorods or nanocubes. It was found that CuTe nanocrystals could be converted to CuInTe₂ by addition of an In reactant. CuInTe₂ nanorods were synthesized using this method. Full article

(This article belongs to the Special Issue Nanoparticles for Photovoltaics)

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