Efficient sensitization of ZnO nanoporous films with CdSe QDs grown by Successive Ionic Layer Adsorption and Reaction (SILAR)

Barceló, Irene; Lana–Villarreal, Teresa; Gómez, Roberto

doi:10.1016/j.jphotochem.2011.03.016

Cited by 43 publications

(21 citation statements)

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“…A similar qualitative change in aspect ratios was reported before for SILAR-based CdSe QDs onto TiO 2 and ZnO surfaces. 13,38 In parallel with the saturation of the QD base diameter (from C3 and onward), we observe the emergence of QD aggregates (PbS bulky phases, see TEM images in Supporting Information Figure S3D,F). The emergence of polycrystalline PbS phases after the QDs saturate in base diameter is consistent with the appearance of an ultrafast component in the ET dynamics for samples beyond C4 due to direct photogeneration and recombination of free carriers within the bulky QD clusters (see Figure S8A,B in Supporting Information).…”

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Interplay Between Structure, Stoichiometry, and Electron Transfer Dynamics in SILAR-based Quantum Dot-Sensitized Oxides

et al. 2014

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We quantify the rate and efficiency of picosecond electron transfer (ET) from PbS nanocrystals, grown by successive ionic layer adsorption and reaction (SILAR), into a mesoporous SnO2 support. Successive SILAR deposition steps allow for stoichiometry- and size-variation of the QDs, characterized using transmission electron microscopy. Whereas for sulfur-rich (p-type) QD surfaces substantial electron trapping at the QD surface occurs, for lead-rich (n-type) QD surfaces, the QD trapping channel is suppressed and the ET efficiency is boosted. The ET efficiency increase achieved by lead-rich QD surfaces is found to be QD-size dependent, increasing linearly with QD surface area. On the other hand, ET rates are found to be independent of both QD size and surface stoichiometry, suggesting that the donor-acceptor energetics (constituting the driving force for ET) are fixed due to Fermi level pinning at the QD/oxide interface. Implications of our results for QD-sensitized solar cell design are discussed.

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Interplay Between Structure, Stoichiometry, and Electron Transfer Dynamics in SILAR-based Quantum Dot-Sensitized Oxides

et al. 2014

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“…Como por exemplo: Nb 2 O 5 , SnO 2, Al 2 O 3 e ZnO. 115 O ZnO tem sido visto como uma alternativa para aplicações em células solares, devido às vantagens que este material apresenta quando comparada com o filme de TiO 2 . Assim como o TiO 2 , o ZnO é um semicondutor do tipo n, com energia de zona proibida de 3,3 eV, mas que apresenta uma maior mobilidade de elétrons.…”

Section: Principais Avanços Descritos Na Literatura Para Células Solaunclassified

Células solares sensibilizadas por pontos quânticos

Vitoreti¹,

Corrêa²,

Raphael³

et al. 2016

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publicado na web em 25/11/2016 QUANTUM DOT-SENSITIZED SOLAR CELLS. Quantum dot solar cells (QDSC) have been subject of extensive research in recent years. QDSC, as a promising alternative to existing solar cells, are among the candidates for next-generation photovoltaic devices that require low cost, high efficiency, so that quantum dots stand out for their unique features and versatile desirable on photovoltaic systems. The rapid development of QDSC provided a significant increase in energy conversion efficiency, which was certified for the first time in 2010 as 2% then being currently as 11.3%, according to the National Renewable Energy Laboratory (NREL). This paper presents a review of the quantum dot-sensitized solar cells and the major advances reported concerning these cells, besides other types of cell architectures involving quantum dots.Keywords: quantum dots; solar cells; quantum dot-sensitized solar cell. INTRODUÇÃONos dias atuais, há um forte apelo a respeito do aquecimento global proveniente do aumento da emissão de gases que agravam o efeito estufa, como o CO 2 , e suas várias consequências para o nosso planeta, como elevação do nível dos mares e alterações climáticas. 1Além disso, sabe-se que as reservas de combustíveis fósseis são finitas, e que a exploração destes combustíveis causa sérios danos ao meio ambiente, pois geram bilhões de toneladas de gases como CO 2 , CO, SO 2 , NO x , além de aerossóis que são lançados na atmosfera.Nesse sentido, com o intuito de prevenir um colapso climático, 2 países desenvolvidos têm agora por lei que diminuir drasticamente a emissão de tais gases, e, para isso, têm se valido de alternativas limpas e renováveis como biomassa, energia eólica e energia solar, 3,4 as quais vêm se destacando pela abundância das fontes e potencial o que permite sua aplicação de maneira eficiente. A produção de energia por meio de células solares é uma alternativa para levar energia a diversas regiões do país, e, assim, estudos vêm sendo realizados e tecnologias têm sido amplamente testadas para produzir dispositivos fotovoltaicos que são aplicados na conversão da luz solar em eletricidade com mais eficiência. Dentre os materiais possíveis para aplicação em células solares, os pontos quânticos (PQs) têm atraído muito interesse em função, principalmente, de suas propriedades ópticas dependentes do tamanho das nanopartículas. 5Os pontos quânticos de semicondutores são constituídos de partículas nanocristalinas e apresentam diâmetro variando entre 1 e 10 nm, o que corresponde a, aproximadamente, entre 100 e 1000 átomos por nanopartícula. Atualmente, a sua aplicação em dispositivos fotovoltaicos têm se tornado objeto de estudo de vários grupos de pesquisa no mundo, uma vez que células solares sensibilizadas com esses materiais atingiram 11,3% de rendimento de conversão solar, em 2016, de acordo com o Laboratório Nacional de Energias Alternativas -NREL dos Estados Unidos. 6 Nos últimos anos, viram-se avanços conceituais e tecnológicos rápidos em vários aspectos de células solares à bas...

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“…[32] Barceló prepared ZnO modified with CdSe QDs nanoporous films with mercaptopropionic as solvent, and the current efficiency was as high as 70%. [33] Different solvents were used to synthesize Bi 2 WO 6 modified with QDs, which showed that the solvents had a certain effect on the synthesis process. [14,15] This is an interesting research topic.…”

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Photocatalytic Performance Analysis of Bi₂WO₆ Modified with CdSe Quantum Dots in Different Solvents

et al. 2020

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Bi2WO6 modified with CdSe quantum dots (QDs) was synthesized in different solvents. Among these prepared photocatalysts, CdSe‐Acetone‐Bi2WO6 demonstrated the best photocatalytic performance as tested by degradation of Rhodamine B (RhB). Moreover, three‐time degradation tests proved that CdSe‐Acetone‐Bi2WO6 had a good photocatalytic stability. The photoluminescence spectroscopy and electrochemical test showed that the recombination of electron hole pairs of CdSe‐Acetone‐Bi2WO6 decreased most obviously, which was consistent with the photocatalytic results.

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Efficient sensitization of ZnO nanoporous films with CdSe QDs grown by Successive Ionic Layer Adsorption and Reaction (SILAR)

Cited by 43 publications

References 36 publications

Interplay Between Structure, Stoichiometry, and Electron Transfer Dynamics in SILAR-based Quantum Dot-Sensitized Oxides

Interplay Between Structure, Stoichiometry, and Electron Transfer Dynamics in SILAR-based Quantum Dot-Sensitized Oxides

Células solares sensibilizadas por pontos quânticos

Photocatalytic Performance Analysis of Bi₂WO₆ Modified with CdSe Quantum Dots in Different Solvents

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Efficient sensitization of ZnO nanoporous films with CdSe QDs grown by Successive Ionic Layer Adsorption and Reaction (SILAR)

Cited by 43 publications

References 36 publications

Interplay Between Structure, Stoichiometry, and Electron Transfer Dynamics in SILAR-based Quantum Dot-Sensitized Oxides

Interplay Between Structure, Stoichiometry, and Electron Transfer Dynamics in SILAR-based Quantum Dot-Sensitized Oxides

Células solares sensibilizadas por pontos quânticos

Photocatalytic Performance Analysis of Bi2WO6 Modified with CdSe Quantum Dots in Different Solvents

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Photocatalytic Performance Analysis of Bi₂WO₆ Modified with CdSe Quantum Dots in Different Solvents