Deciphering the role of quantum dot size in the ultrafast charge carrier dynamics at the perovskite–quantum dot interface

Piątkowski, P.; Masi, Sofia; Galář, Pavel; Gutiérrez, Mario; Ngo, Thi Tuyen; Mora‐Seró, Iván; Douhal, Abderrazzak

doi:10.1039/d0tc03835k

Cited by 10 publications

(13 citation statements)

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“…There are no significant differences in terms of structural and optical properties over the concentration of added PbS QDs. However, the presence of FAPI-PbS QDs, which do not affect the emission wavelength and the bandgap value, Figure S6e,f, induced a decrease in the PL emission intensity of perovskite film with respect to reference FAPI (air) film, Figure S6e. − …”

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confidence: 98%

“…It is observed that the charge carriers are relatively long-lasting in the reference FAPI (air) films than 1 mg/mL (air) films. In this context it is worth pointing out that the effect of PbS addition in the steady-state PL and TRPL behavior is the result of two concomitant and opposite mechanisms: (i) the increase of FAPI domain size due to the seed effect for crystal growth of PbS QDs additives and (ii) the PbS QDs acting as nonradiative recombination center. , The space charge-limited current (SCLC) is measured to quantitatively evaluate the trap density ( n trap ) in the FAPI (air) and 1 mg/mL (air) perovskite films. Figure S16b, shows the dark current–voltage ( I – V ) curves of electron-only devices with the configuration of ITO/SnO 2 /FAPI (air) or 1 mg/mL (air))/PCBM/Au.…”

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confidence: 99%

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Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

et al. 2021

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Due to the high industrial interest for perovskite-based photovoltaic devices, there is an urgent need to fabricate them under ambient atmosphere, not limited to low relative humidity (RH) conditions. The formamidinium lead iodide (FAPI) perovskite α-black phase is not stable at room temperature and is challenging to stabilize in an ambient environment. In this work, we show that pure FAPI perovskite solar cells (PSCs) have a dramatic increase of device long-term stability when prepared under ambient air compared to FAPI PSCs made under nitrogen, both fabricated with N -methylpyrrolidone (NMP). The T 80 parameter, the time in which the efficiency drops to 80% of the initial value, increases from 21 (in N 2 ) to 112 days (in ambient) to 145 days if PbS quantum dots (QDs) are introduced as additives in air-prepared FAPI PSCs. Furthermore, by adding methylammonium chloride (MACl) the power conversion efficiency (PCE) reaches 19.4% and devices maintain 100% of the original performance for at least 53 days. The presence of Pb–O bonds only in the FAPI films prepared in ambient conditions blocks the propagation of α- to δ-FAPI phase conversion. Thus, these results open the way to a new strategy for the stabilization in ambient air toward perovskite solar cells commercialization.

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Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

et al. 2021

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Section: Carrier Dynamics In Quantum Dot/perovskite Systemsmentioning

confidence: 99%

Combining Perovskites and Quantum Dots: Synthesis, Characterization, and Applications in Solar Cells, LEDs, and Photodetectors

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Piątkowski

Mora‐Seró

et al. 2022

Advanced Optical Materials

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Metal halide perovskites having high defect tolerance, high absorption characteristics, and high carrier mobility demonstrate great promise as potential light harvesters in photovoltaics and optoelectronics and have experienced an unprecedented development since their occurrence in 2009. Semiconductor quantum dots (QDs), on the other hand, have also been proved to be very flexible toward shape, dimension, bandgap, and optical properties for constructing optoelectronic devices. Of late, a strategic combination of both materials has demonstrated extraordinary promise in photovoltaic applications and optoelectronic devices. Combining QDs and perovskites has proved to be quite an effective strategy toward the formation of pinhole‐free and more stable perovskite crystals along with tunability of other properties. To boost this exciting research field, it is imperative to summarize the work done so far in recent years to provide an intriguing insight. This review is a critical account of the advanced strategy toward combining these two fascinating materials, including their different synthetic approaches regarding heteroepitaxial growth of perovskite crystals on QDs, carrier dynamics at the interface and potential application in the field of solar cells, light emitting diodes, and photodetectors.

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“…PbY–perovskite nanocomposites have been used in photodetectors, , LEDs, , and photovoltaics. , Remarkably, PbS NC inclusions can provide stability to the cubic phase of perovskites suppressing the cubic–orthorhombic phase transition, and perovskite passivation layers enhance charge carrier separation in PbS NCs by providing adequate energy alignment . Furthermore, PbY nanocomposites with secondary phases might be of great importance for thermoelectrics. , …”

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“…42−44 Alternative approaches to dope NC-based solids have focused on changing the NC surface chemistry, 30,36,38,45−48 inducing partial cation exchange, 49,50 and blending with other NCs. 35,51,52 PbY−perovskite nanocomposites have been used in photodetectors, 53,54 LEDs, 55,56 and photovoltaics. 57,58 Remarkably, PbS NC inclusions can provide stability to the cubic phase of perovskites suppressing the cubic−orthorhombic phase transition, 59 and perovskite passivation layers enhance charge carrier separation in PbS NCs by providing adequate energy alignment.…”

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Exploiting the Lability of Metal Halide Perovskites for Doping Semiconductor Nanocomposites

et al. 2021

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Cesium lead halides have intrinsically unstable crystal lattices and easily transform within perovskite and nonperovskite structures. In this work, we explore the conversion of the perovskite CsPbBr 3 into Cs 4 PbBr 6 in the presence of PbS at 450 °C to produce doped nanocrystal-based composites with embedded Cs 4 PbBr 6 nanoprecipitates. We show that PbBr 2 is extracted from CsPbBr 3 and diffuses into the PbS lattice with a consequent increase in the concentration of free charge carriers. This new doping strategy enables the adjustment of the density of charge carriers between 10 19 and 10 20 cm –3 , and it may serve as a general strategy for doping other nanocrystal-based semiconductors.

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Deciphering the role of quantum dot size in the ultrafast charge carrier dynamics at the perovskite–quantum dot interface

Abstract: Deciphering the electrons and holes (e, h) dynamics at the interfaces of photoexcited hybrid materials at different densities of photoexcited charge carriers is paramount to the development of efficient optoelectronic...

Cited by 10 publications

References 65 publications

Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

Combining Perovskites and Quantum Dots: Synthesis, Characterization, and Applications in Solar Cells, LEDs, and Photodetectors

Exploiting the Lability of Metal Halide Perovskites for Doping Semiconductor Nanocomposites

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