Highly stable and efficient solid-state solar cells based on methylammonium lead bromide (CH3NH3PbBr3) perovskite quantum dots

Mali, Sawanta S.; Shim, Chang-Su; Hong, Chang Kook

doi:10.1038/am.2015.86

Cited by 120 publications

(65 citation statements)

References 35 publications

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“…Such effort has been successful, and in 2014 a power-conversion efficiency of more than 10% has been reported [14] for solar cells made of methylammonium lead bromide, CH 3 NH 3 PbBr 3 (MAPbBr 3 ). Subsequently, high-performing solid-state solar cells based on MAPbBr 3 quantum dots with an 11.4% efficiency and cell lifetimes of more than 4 months have also been reported [15]. Finally, nanoparticles of these Br-based perovskites have been recently proposed as a new material for light-emitting diodes [16], and their application as visible-light emitters was also demonstrated [7].…”

Section: Introductionmentioning

confidence: 99%

Exploring the cation dynamics in lead-bromide hybrid perovskites

2016

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Density functional theory including a many-body treatment of dispersive forces is used to describe the interplay between structure and electronic properties of two prototypical Br-based hybrid perovskites, namely, CH 3 NH 3 PbBr 3 and HC(NH 2 ) 2 PbBr 3 . We find that, like for some of their iodine-based counterparts, the molecules' orientation plays a crucial role in determining the shape of both the conduction and valence bands around the band edges. This is mostly evident in the case of CH 3 NH 3 PbBr 3 , which is a direct band-gap semiconductor when the CH 3 NH 3 group is oriented along the (111) direction but turns indirect when the orientation is (100). We have constructed a simple dipole model, with parameters all evaluated from ab initio calculations, to describe the molecules' depolarization dynamics. We find that, once the molecules are initially orientated along a given high-symmetry direction, their room-temperature depolarization depends on the specific material investigated. In particular we find that the ratio between the polarization decay constant of CH 3 NH 3 PbBr 3 and that of HC(NH 2 ) 2 PbBr 3 is about 2 at room temperature. With these results at hand we suggest a simple luminescence decay experiment to prove our findings and establish a correlation between optical activity and the molecules' dynamics in these materials.

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Section: Introductionmentioning

confidence: 99%

Exploring the cation dynamics in lead-bromide hybrid perovskites

2016

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“…It was also found that 1D NWs exhibited faster carrier and higher lateral conductivity compared with bulk 3D perovskites. Mali et al 33 fabricated MAPbBr 3 NC-based solar cells with a power conversion efficiency of 11.4% using FTO/Bl-TiO 2 /mp-TiO 2 +MAPbBr 3 (~2 nm NCs)/PTAA/Au as a device configuration (Figure 11b). In this fabrication method, MAPbBr 3 NCs were prepared by spin coating a dimethyl sulfoxide solution of MA bromide and PbBr 2 onto a mesoporous TiO 2 layer followed by annealing on a hot plate.…”

Section: Perovskite Ncs In Solar Cells and Photodiodesmentioning

confidence: 99%

“…Perovskite NCs have already shown great promise in many applications such as lasers, LEDs and photovoltaic devices. 10,23,[31][32][33][34][35][36][37][38] Even though the research on perovskite NCs is still in its starting stage, they are expected to have a significant role in the development of modern nanoscience and nanotechnology in the near future. This review provides an overview of the up-to-date developments in the synthesis of hybrid organicinorganic and all-inorganic perovskite NCs, their attractive optical properties and related emerging applications.…”

Section: Introductionmentioning

confidence: 99%

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

et al. 2016

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Lead halide perovskite nanocrystals (NCs) are receiving a lot of attention nowadays, due to their exceptionally high photoluminescence quantum yields reaching almost 100% and tunability of their optical band gap over the entire visible spectral range by modifying composition or dimensionality/size. We review recent developments in the direct synthesis and ion exchange-based reactions, leading to hybrid organic-inorganic (CH 3 NH 3 PbX 3 ) and all-inorganic (CsPbX 3 ) lead halide (X = Cl, Br, I) perovskite NCs, and consider their optical properties related to quantum confinement effects, single emission spectroscopy and lasing. We summarize recent developments on perovskite NCs employed as an active material in several applications such as light-emitting devices, solar cells and photodetectors, and provide a critical outlook into the existing and future challenges.

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“…3 PNCs exhibit intense fluorescence due to quantum confinement effect which is easily tuned by band-gap engineering and chemical composition 4 and show great promise when compared with perovskite films. 5 Addressing fundamental photophysical properties of PNCs in combination with other materials calls for exploration, and is expected to further the applications of PNCs in LEDs and solar cells. Photoinduced electron transfer (PET) is the fundamental process in natural and artificial photosynthesis.…”

mentioning

confidence: 99%

“…5 Addressing fundamental photophysical properties of PNCs in combination with other materials calls for exploration, and is expected to further the applications of PNCs in LEDs and solar cells. Photoinduced electron transfer (PET) is the fundamental process in natural and artificial photosynthesis.…”

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confidence: 99%

Channeling Exciton Migration into Electron Transfer in Formamidinium Lead Bromide Perovskite Nanocrystal/Fullerene Composites

et al. 2016

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Hydrophobic-capped nanocrystals of formamidinium lead bromide (FAPbBr3) perovskite (PNC) show bright and stable fluorescence in the solution and thin film states. When compared with isolated PNCs in a solution, close-packed PNCs in a thin film show extended fluorescence lifetime (ca 4.2 µs), which is due to hopping or migration of photogenerated excitons among PNCs. Both fluorescence quantum efficiency and lifetime decrease in a PNC thin film doped with C60, which is attributed to channeling of exciton migration into electron transfer to fullerenes. On the other hand, quenching of fluorescence intensity of a PNC solution isn't accompanied by any change in fluorescence lifetime, indicating static electron transfer to C60 adsorbed onto the hydrophobic surface of individual PNCs. Exciton migration among close-packed PNCs and electron transfer to C60 places C60-doped PNC thin films among cost-eff ective antenna systems for solar cells.Metal halide perovskites have emerged into a class of promising materials for top 10 future technologies such as solar cells, which is owing to their distinctive optical and electronic properties and cost-effective production. Recent reports show solar photon to electricity conversion efficiency of perovskite solar cells exceeds 20%, keeping the upper limit open to further research, which, on the other hand, hits the roof for silicon photovoltaics. 1 The commendable optical and electronic properties of perovskites make them also useful for several other optical and electronic devices such as light-emitting diodes, lasers, photodetectors, sensors and memory devices. 2 Besides the straightforward preparation and applications of perovskite films, very recently, hybrid PNCs have become popular with great research interest and technological relevance. 3 PNCs exhibit intense fluorescence due to quantum confinement effect which is easily tuned by band-gap engineering and chemical composition 4 and show great promise when compared with perovskite films. 5 Addressing fundamental photophysical properties of PNCs in combination with other materials calls for exploration, and is expected to further the applications of PNCs in LEDs and solar cells. Photoinduced electron transfer (PET) is the fundamental process in natural and artificial photosynthesis. 6 Recently, electron transfer studies in perovskite-based electron donoracceptor systems receive great momentum, which is owing to their potential application in solar cell technology. For example, Grätzel et al. revealed ultrafast electron transfer from photoexcited perovskite to mesoporous titanium dioxide, leading to efficient charge separation. 7 In a subsequent report, Sunderström et al. pinpointed the time scale and mechanism of electron transfer from perovskite to an organic acceptor molecule. 8 PNCs have been explored in electron transfer to classical acceptors such as benzoquinone, 9 phenothiazine 9 and perylene. 10 Recent studies by Huang et al. and Sargent et al. show improved stability and photocurrent response for solar cells based ...

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Highly stable and efficient solid-state solar cells based on methylammonium lead bromide (CH3NH3PbBr3) perovskite quantum dots

Cited by 120 publications

References 35 publications

Exploring the cation dynamics in lead-bromide hybrid perovskites

Exploring the cation dynamics in lead-bromide hybrid perovskites

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

Channeling Exciton Migration into Electron Transfer in Formamidinium Lead Bromide Perovskite Nanocrystal/Fullerene Composites

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