Nanowires with unusual packing of poly(3-hexylthiophene)s induced by electric fields

Yu, Zhi; Yang, Xiubao; Cui, Hong; Qiu, Feng

doi:10.1039/c4tc00668b

Cited by 26 publications

(19 citation statements)

References 53 publications

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“…The t Ni value of the CaTiO 3 :0.2 mol.% Ni 2þ samples is $1.06 ms, which is comparable with the values previously reported for other oxide host materials [18,[26][27][28][29].…”

Section: Spectral Analysis Absorption Peak Locations Ofsupporting

confidence: 86%

CaTiO₃:Er³⁺,Ni²⁺broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

Luitel

Mizuno

Takeda

2017

Phys. Status Solidi A

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We have realized broadband‐sensitive upconversion (UC) in CaTiO3:Er3+,Ni2+ that can harvest 1060–1630 nm photons, which are not utilized by present crystalline silicon (c‐Si) solar cells, and upconvert to 980 nm. The Ni2+ sensitizers absorb 1060–1450 nm photons and efficiently transfer the energies to the Er3+ emitters. In addition to 1450–1630 nm photons that are directly absorbed by the Er3+ ions, 1060–1450 nm photons are also upconverted to 980 nm by the Er3+, Ni2+ codoped upconverter, leading to a more remarkably enhanced conversion efficiency of c‐Si solar cells compared to conventional Er3+‐only doped upconverters. Codoping with Nb5+ to compensate for the charge imbalance caused by the Ni2+ doping at the Ti4+ sites intensified the UC emission. Similarly, charge imbalance caused by the Er3+ doping at the Ca2+ sites was compensated by codoping with alkali ions (Li+, Na+, K+), resulting in a significant improvement in the UC emission intensity. Nearly 6.5‐fold intense UC emission was realized in the newly developed CaTiO3:Er,Ni upconverter compared to the previously reported CaZrO3:Er,Ni one. It is explained on the basis of higher Ni → Er energy transfer efficiency and a more efficient Er3+ UC emission. If these upconverters are applied at the rear‐face of a bifacial c‐Si solar cell, ∼4.8% absolute efficiency improvement is possible.

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“…The t Ni value of the CaTiO 3 :0.2 mol.% Ni 2þ samples is $1.06 ms, which is comparable with the values previously reported for other oxide host materials [18,[26][27][28][29].…”

Section: Spectral Analysis Absorption Peak Locations Ofsupporting

confidence: 86%

CaTiO₃:Er³⁺,Ni²⁺broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

Luitel

Mizuno

Takeda

2017

Phys. Status Solidi A

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“…Furthermore, the hole transfer efficiency of BiVO 4 at the semiconductor-electrolyte interface during water oxidation is intrinsically low. [10,11] To overcome these limitations, different strategies have been proposed, including the introduction of dopants such as W, [12] Mo, [13] or both [14,15] to enhance carrier mobility; the functionalization with OER catalysts such as electrodeposited cobalt oxides/ oxyhydroxides [11] or FeOOH/NiOOH [16] to facilitate water oxidation kinetics; the nanostructuring of the BiVO 4 morphology by the fabrication of nanorods, nanowires, and disordered nanoparticle films, which provide hole diffusion length requirements (<100 nm), and maximize the electrochemically active surface area (ECSA) of the photoanodes. [16][17][18][19][20] These approaches have been demonstrated to improve hole transfer at the interface and thus suppress charge recombination, resulting in significantly increased hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

High‐Temperature One‐Step Synthesis of Efficient Nanostructured Bismuth Vanadate Photoanodes for Water Oxidation

Trần‐Phú

Chen

et al. 2019

Energy Tech

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Bismuth vanadate (BiVO4) is a promising photoanode material for photoelectrochemical water splitting due to its well‐suited valence band edge and comparatively narrow band gap. First insights on the high‐temperature and scalable synthesis of efficient nanostructured BiVO4 photoanodes for water oxidation are provided. Nanostructured BiVO4 films with a tunable optical density and porosity ranging from 12% to 80% are synthesized in few seconds by direct deposition of flame‐made BiVO4 nanoparticle aerosols. The impact of the BiVO4 film structural properties on the photooxidation performance has been systematically investigated by a set of electrochemical and physical characterizations indicating key directions for its morphological optimization. It is found that the BiVO4 water oxidization performance is mainly determined by two competitive factors, viz., accessible surface area and carrier conductivity through the grain boundaries. Optimization of these two factors increases the photocurrent densities by more than three times resulting in ≈1.5 mA cm−2 for sulfite oxidation and ≈1 mA cm−2 for water oxidation with a FeOOH/NiOOH co‐catalyst at 1.0 V vs the reversible hydrogen electrode (RHE) under simulated 1 sun illumination. These findings provide novel insights into the structure–activity relationships of high‐temperature synthesized BiVO4 photoanodes for solar‐powered water splitting and introduce a scalable and low‐cost approach for their rapid nanofabrication.

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“…For the m-ITIC-O-H, which has the linear alkoxy groups, its BHJ film shows a smooth surface morphology with a slightly increased RMS roughness of 3.81 nm (Figure 4e). Notably, the BHJ films with m-ITIC-O-EH, which has the branched alkoxy side chains, exhibit an improved morphology with a bundle shape of networks (Figure 4f), inducing efficient charge transport pathways throughout the films, [38,39] and thereby maintaining the J sc even up to the thickness of ≈300 nm. Therefore, we conclude that the phase separation behavior of the donor and the acceptor depends on the thickness of the photoactive layer, and their sensitive surface energy matching is crucial to achieve the desired morphology for high performance OPVs with the thick photoactive layer.…”

Section: Relationship Between the Bhj Morphology And The Side Chains mentioning

confidence: 99%

Achieving Thickness‐Insensitive Morphology of the Photoactive Layer for Printable Organic Photovoltaic Cells via Side Chain Engineering in Nonfullerene Acceptors

Lee

Park

Lee

et al. 2019

Advanced Energy Materials

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Although high power conversion efficiency of over 14% has been achieved using nonfullerene acceptors (NFAs) in organic photovoltaics (OPVs), securing their insensitive device performance to the thickness of the photoactive layer remains an indispensable requirement for their successful commercialization via printing technologies. In this study, by synthesizing a new series of ITIC‐based NFAs having alkyl or alkoxy groups, it is found that the bulk heterojunction morphology dependence on the thickness of the photoactive layer becomes more severe as the difference in the surface energy of the donor and acceptor increases. It is believed that this observation is the origin that yields the device performance dependence on the thickness of the photoactive layer. Through sensitive control of the surface energy of these ITIC‐based NFAs, it is demonstrated that thickness‐insensitive OPVs can be achieved even using a doctor blade technique under air without using any additives. It is believed that present approach provides an important insight into the design of photoactive materials and morphology control for the printable OPVs using NFAs.

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Nanowires with unusual packing of poly(3-hexylthiophene)s induced by electric fields

Abstract: Unusual nanowires in thin films of poly(3-hexylthiophene) have been prepared by applying an electric field.

Cited by 26 publications

References 53 publications

CaTiO₃:Er³⁺,Ni²⁺broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

CaTiO₃:Er³⁺,Ni²⁺broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

High‐Temperature One‐Step Synthesis of Efficient Nanostructured Bismuth Vanadate Photoanodes for Water Oxidation

Achieving Thickness‐Insensitive Morphology of the Photoactive Layer for Printable Organic Photovoltaic Cells via Side Chain Engineering in Nonfullerene Acceptors

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Nanowires with unusual packing of poly(3-hexylthiophene)s induced by electric fields

Abstract: Unusual nanowires in thin films of poly(3-hexylthiophene) have been prepared by applying an electric field.

Cited by 26 publications

References 53 publications

CaTiO3:Er3+,Ni2+broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

CaTiO3:Er3+,Ni2+broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

High‐Temperature One‐Step Synthesis of Efficient Nanostructured Bismuth Vanadate Photoanodes for Water Oxidation

Achieving Thickness‐Insensitive Morphology of the Photoactive Layer for Printable Organic Photovoltaic Cells via Side Chain Engineering in Nonfullerene Acceptors

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Product

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CaTiO₃:Er³⁺,Ni²⁺broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells

CaTiO₃:Er³⁺,Ni²⁺broadband‐sensitive upconverter: An effective way to harvest unused NIR solar irradiation for crystalline silicon solar cells