Low temperature processable ultra-thin WO3 Langmuir-Blodgett film as excellent hole blocking layer for enhanced performance in dye sensitized solar cell

Prakash, Om; Saxena, Vibha; Choudhury, Sipra; Tanvi,; Singh, Ajay; Debnath, A. K.; Mahajan, Aman; Muthe, K.P.; Aswal, D. K.

doi:10.1016/j.electacta.2019.06.047

Cited by 20 publications

(6 citation statements)

References 54 publications

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“…The sol-gel method was used only to prepare metals and semi-metal oxides then extended to organic-inorganic hybrids and occasionally to describe the production of pure organic networks. 80 80 The sol-gel deposition techniques are; dip-coatings, [213][214][215][216] spin-coating, 217 Inkjet-printing, 218,219 Langmuir-Blodgett, [220][221][222] Spray-pyrolysis. 76,223 This technology requires cheaper equipment for large-area surface coatings as compared to gas-phase technologies.…”

Section: Sol-gel Methodsmentioning

confidence: 99%

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

et al. 2021

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Section: Sol-gel Methodsmentioning

confidence: 99%

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

et al. 2021

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“…17 An effective compact layer is supposed to be a dense and transparent pinhole-free homogeneous film with an appropriate work function. Until now, numerous materials have been used as compact layers, such as WO 3 , 18 SnO 2 , 19 ZnO, 20 TiO 2 , 21 etc. Of all of the materials, the TiO 2 compact layer is extensively used because of its high transparency and efficient electron transport properties.…”

Section: ■ Introductionmentioning

confidence: 99%

Interfacial Engineering of a TiO₂ Photoanode via Graphene Nanoribbons for Efficient Quantum-Dot-Sensitized Solar Cells and Photoelectrochemical Water Splitting

Singh,

Bhullar,

Mahajan

2023

Energy Fuels

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Quantum dot (QD)-sensitized TiO 2 photoanodes are a common component of quantum dot-sensitized solar cells (QDSSCs) and photoelectrochemical (PEC) water-splitting applications. The QD-sensitized TiO 2 photoanode harvested energy from sunlight and then produced electric energy and clean H 2 fuel by QDSSCs and PEC water-splitting devices, respectively. Despite various interfacial modifications, such photoanode still suffers from numerous recombinations and poor electron transport, degrading the performance of devices. In the present work, highly conductive one-dimensional (1D) graphene nanoribbons (GNRs) have been incorporated in both TiO 2 -based compact as well as mesoporous (m-TiO 2 ) layers to reduce recombinations and achieve a superior charge transport network. Initially, the content of GNR has been optimized in a compact layer, and the maximum power conversion efficiency (PCE) in QDSSCs and photocurrent density in PEC water splitting have been attained around 2.33% and 1.92 mA cm −2 , respectively. Furthermore, incorporation of GNR in the m-TiO 2 layer delivered enhanced short-circuit current density and better electron transport in both QDSSCs and PEC water splitting. The optimized device showed 3.06% PCE for QDSSCs and 2.39 mA cm −2 photocurrent density for PEC water splitting. After that, the optimized concentrations of GNR from both cases have been used to prepare devices that give 113 and 80% enhancement in PCE and photocurrent density in QDSSCs and PEC water splitting, respectively. Moreover, an improvement in PCE of QDSSCs to 4.55% and photocurrent density of the PEC water-splitting device of 2.67 mA cm −2 has been recorded with co-sensitization of the optimized photoanode.

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“…Crystalline TiO 2 thin films have conventionally been used in third-generation solar cells viz. dye sensitized (DSCs) and perovskite solar cells (PSCs) as hole-blocking and electron-transport layer (ETL) to hinder the recombination at fluorine-doped tin oxide (FTO)/electrolyte (or hole transport layer) interface and efficiently transport the electron at FTO/m-TiO 2 interface, thereby resulting in improved photon-to-current conversion efficiency (η) [1,2] (Figure S1, Supporting Information). Amongst three crystalline phases of TiO 2 , anatase and rutile phases have widely been used because of their higher stability than brookite phase.…”

Section: Introductionmentioning

confidence: 99%

“…[10,11] In our earlier work, we had demonstrated excellent blocking properties of low temperature-processable ultrathin WO 3 films and the potential of these films as substitutes for TiO 2 ETLs in DSCs. [2] In contrast to TiO 2 , the phase diagram of WO 3 is very rich and shows five different polymorphs, at ambient pressure. Bulk WO 3 possesses cubic ReO 3 structure consisting of vertex-sharing WO 3 octahedra, which becomes more and more distorted during temperature variation, and results in formation of different phases.…”

Section: Introductionmentioning

confidence: 99%

Phase Variation of Ultrathin WO₃ Electron‐Transport Layer Prepared by Scalable Langmuir–Blodgett Technique to Boost Efficiency of Dye Sensitized Solar Cells

et al. 2022

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In third‐generation solar cells, dye sensitized (DSCs) and perovskite (PSCs) both, the role of electron‐transport layers (ETLs) is to block hole transfer at fluorine‐doped tin oxide/mesoporous TiO2 interface, while efficiently transporting the electron at this interface. Conventional solution‐processed dense anatase TiO2 ETL is limited by its low electron mobility. WO3, despite having higher electron mobility and chemical stability, has seldom been used as ETL in DSCs/PSCs, owing to poor crystalline structure and interfacial charge transfer in ETLs prepared using existing methods. Herein this paper, ultrathin and uniform WO3 films of different crystalline structures, such as tetragonal (t‐), orthorhombic (o−), hexagonal (h−), and monoclinic (m−), prepared by scalable Langmuir–Blodgett method, are reported. The efficiency (η) of DSCs fabricated with ETL having high‐symmetry phases of WO3 (h‐WO3, o‐WO3, t‐WO3) is found to exceed the efficiency of devices having ETL of low‐symmetry WO3 phase (m‐WO3). Further, highest η ≈ 9.53%, tantamount to an improvement of 13%, is found in DSCs fabricated with ETL having a mixed phase of o‐ and t‐WO3 and surpassed η of devices based on TiO2 ETLs (8.4%). Herein, the role of structure/phase of WO3 ETLs toward enhancing device performance and outperforming the conventional TiO2 ETLs‐based DSCs is highlighted.

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Low temperature processable ultra-thin WO3 Langmuir-Blodgett film as excellent hole blocking layer for enhanced performance in dye sensitized solar cell

Cited by 20 publications

References 54 publications

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

Interfacial Engineering of a TiO₂ Photoanode via Graphene Nanoribbons for Efficient Quantum-Dot-Sensitized Solar Cells and Photoelectrochemical Water Splitting

Phase Variation of Ultrathin WO₃ Electron‐Transport Layer Prepared by Scalable Langmuir–Blodgett Technique to Boost Efficiency of Dye Sensitized Solar Cells

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Low temperature processable ultra-thin WO3 Langmuir-Blodgett film as excellent hole blocking layer for enhanced performance in dye sensitized solar cell

Cited by 20 publications

References 54 publications

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

Interfacial Engineering of a TiO2 Photoanode via Graphene Nanoribbons for Efficient Quantum-Dot-Sensitized Solar Cells and Photoelectrochemical Water Splitting

Phase Variation of Ultrathin WO3 Electron‐Transport Layer Prepared by Scalable Langmuir–Blodgett Technique to Boost Efficiency of Dye Sensitized Solar Cells

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Interfacial Engineering of a TiO₂ Photoanode via Graphene Nanoribbons for Efficient Quantum-Dot-Sensitized Solar Cells and Photoelectrochemical Water Splitting

Phase Variation of Ultrathin WO₃ Electron‐Transport Layer Prepared by Scalable Langmuir–Blodgett Technique to Boost Efficiency of Dye Sensitized Solar Cells