Multiple Charge Transfer Dynamics in Colloidal CsPbBr<sub>3</sub> Perovskite Quantum Dots Sensitized Molecular Adsorbate

Maity, Partha; Dana, Jayanta; Ghosh, Hirendra N.

doi:10.1021/acs.jpcc.6b06853

Cited by 55 publications

(62 citation statements)

References 44 publications

(73 reference statements)

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“…Several studies have already shown that perovskite NCs possess great potential for solution‐processable photovoltaic devices under ambient atmosphere due to their high environmental and thermodynamic stabilities . Other studies demonstrate the charge transfer dynamics for perovskite NCs in heterojunctions showing great potential for charge extraction in further applications . Most reported perovskite photovoltaic devices are generally fabricated in a layer‐by‐layer configuration in which the exciton dissociation occurs at the interface of the perovskite NC layer and the respective electron or hole‐transport layer.…”

Section: Responsivity (R) and Detectivity (D*) Of Photodetectors Undementioning

confidence: 99%

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Yao

Bohn

Huang

et al. 2019

Advanced Optical Materials

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These properties have led to an enormous progress in various optoelectronic applications, especially to the impressive advances in the efficiency of photovoltaics that surged from 3.8% to 22% during the past few years. [5][6][7][8][9] Although most early research studies were focused on bulk thin film perovskites, very recently there has been a growing interest in exploring perovskite nanocrystals (NCs) for various applications due to their enhanced stability in the presence of ligands. [10][11][12][13] Several studies have already shown that perovskite NCs possess great potential for solution-processable photovoltaic devices under ambient atmosphere due to their high environmental and thermodynamic stabilities. [14][15][16] Other studies demonstrate the charge transfer dynamics for perovskite NCs in heterojunctions showing great potential for charge extraction in further applications. [17][18][19][20] Most reported perovskite photovoltaic devices are generally fabricated in a layer-by-layer configuration in which the exciton dissociation occurs at the interface of the perovskite NC layer and the respective electron or hole-transport layer. Therefore, the device performance relies on the diffusion of excitons or free carriers in the perovskite NC layer, which is reported as a fatal issue for ligand-capped colloidal NCs. [21][22][23][24] It is worth mentioning that organic semiconductor-based photovoltaic devices also suffer from similar problems. In order to enrich the donor-acceptor interfaces as well as to shrink the exciton diffusion path length, blend structures (donor and acceptor materials are mixed in one layer) have often been employed for achieving highly efficient organic photovoltaic devices. [25][26][27][28] However, it is difficult to fabricate such blend structures based on bulk thin film perovskites which are grown using precursors dissolved in polar solvents such as dimethylformamide and dimethyl sulfoxide. [5][6][7][8][9] In contrast, perovskite NCs fortunately are commonly dispersed in organic solvents in which organic electron-acceptor materials such as the fullerene derivative phenyl-C 61 -butyric acid methyl ester (PCBM) can be dissolved as well. This enables the fabrication of perovskite NC/PCBM blend structures similar to bulk heterojunction configurations in organic photovoltaic devices. Recently, Shen et al. have shown the fabrication of Solution-processable perovskite nanocrystals (NCs) are gaining increasing interest in the field of photovoltaics because of their enhanced stability compared to their thin-film counterparts. However, the charge transfer dynamics in perovskite NC based light-harvesting systems are not well understood. By applying femtosecond differential transmission (DT) spectroscopy the photoinduced charge transfer from inorganic perovskite CsPbBr 3 NCs to the fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM) is investigated for two fundamentally different architectures, namely layer-by-layer heterostructures and blend structures. By varying the thickness ...

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Section: Responsivity (R) and Detectivity (D*) Of Photodetectors Undementioning

confidence: 99%

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Yao

Bohn

Huang

et al. 2019

Advanced Optical Materials

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“…Com isso, PQs de perovsquitas à base de chumbo tri-halogeneto de césio (CsPbX 3 ), completamente inorgânico, têm sido estudados atualmente como uma alternativa para aplicação em células solares, 100 uma vez que já foi reportada a montagem de um dispositivo fotovoltaico sensibilizado com PQs de perovsquitas híbridos pela primeira vez em 2011, obtendo-se eficiência de conversão de 6,5%. 101 Em 2016, PQs coloidais de perovsquitas inorgânicos foram aplicados como sensibilizadores, por Kulbak e colaboradores, 102 obtendo 6,6% de eficiência de conversão de energia, apresentando maior estabilidade em relação às perovsquitas à base de metilamônio.…”

Section: Células Solares Sensibilizadas Por Pontos Quânticosunclassified

Células solares sensibilizadas por pontos quânticos

Vitoreti¹,

Corrêa²,

Raphael³

et al. 2016

Quim. Nova

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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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“…Notably, the highest charge carrier lifetime was observed for stoichiometrically balanced samples, while impurities in the other two samples led to creation of nonradiative recombination sites . In another report, issues pertaining to narrow absorption in the solar spectrum and low charge dynamics in CsMX 3 perovskites are resolved by cosynthetization of a dibromofluorecein‐CsPbBr 3 quantum dot complex …”

Section: Applications Of Inorganic and Layered Perovskite Materialsmentioning

confidence: 98%

Inorganic and Layered Perovskites for Optoelectronic Devices

et al. 2019

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Organic-inorganic halide perovskites are making breakthroughs in a range of optoelectronic devices. Reports of >23% certified power conversion efficiency in photovoltaic devices, external quantum efficiency >21% in light-emitting diodes (LEDs), continuous-wave lasing and ultralow lasing thresholds in optically pumped lasers, and detectivity in photodetectors on a par with commercial GaAs rivals are being witnessed, making them the fastest ever emerging material technology. Still, questions on their toxicity and long-term stability raise concerns toward their market entry. The intrinsic instability in these materials arises due to the organic cation, typically the volatile methylamine (MA), which contributes to hysteresis in the current-voltage characteristics and ion migration. Alternative inorganic substitutes to MA, such as cesium, and large organic cations that lead to a layered structure, enhance structural as well as device operational stability. These perovskites also provide a high exciton binding energy that is a prerequisite to enhance radiative emission yield in LEDs. The incorporation of inorganic and layered perovskites, in the form of polycrystalline films or as single-crystalline nanostructure morphologies, is now leading to the demonstration of stable devices with excellent performance parameters. Herein, key developments made in various optoelectronic devices using these perovskites are summarized and an outlook toward stable yet efficient devices is presented.

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Multiple Charge Transfer Dynamics in Colloidal CsPbBr₃ Perovskite Quantum Dots Sensitized Molecular Adsorbate

Cited by 55 publications

References 44 publications

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Células solares sensibilizadas por pontos quânticos

Inorganic and Layered Perovskites for Optoelectronic Devices

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Multiple Charge Transfer Dynamics in Colloidal CsPbBr3 Perovskite Quantum Dots Sensitized Molecular Adsorbate

Cited by 55 publications

References 44 publications

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr3 Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr3 Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Células solares sensibilizadas por pontos quânticos

Inorganic and Layered Perovskites for Optoelectronic Devices

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Resources

About

Multiple Charge Transfer Dynamics in Colloidal CsPbBr₃ Perovskite Quantum Dots Sensitized Molecular Adsorbate

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures

Exciton Diffusion Lengths and Dissociation Rates in CsPbBr₃ Nanocrystal–Fullerene Composites: Layer‐by‐Layer versus Blend Structures