Ligand engineering on CdTe quantum dots in perovskite solar cells for suppressed hysteresis

Xiao, Jiawen; Ma, Sai; Yu, Shijie; Zhou, Chenxiao; Liu, Pengfei; Chen, Yihua; Zhou, Huanping; Li, Yujing; Chen, Qi

doi:10.1016/j.nanoen.2018.01.035

Cited by 47 publications

(32 citation statements)

References 54 publications

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“…Correspondingly observed are the enhanced charge transport and the PCE value of the perovskite film with PbS NCs (Figures S6 and S10, Supporting Information). We note that the selection strategy of perovskite additives for improving perovskite solar cell performance through different aspects were detailed in recent reports …”

Section: Introductionmentioning

confidence: 99%

Unveiling the Nanoparticle‐Seeded Catalytic Nucleation Kinetics of Perovskite Solar Cells by Time‐Resolved GIXS

Lin

Chang

et al. 2019

Adv Funct Materials

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Recently, a new seeding growth approach for perovskite thin films is reported to significantly enhance the device performance of perovskite solar cells. This work unveils the intermediate structures and the corresponding growth kinetics during conversion to perovskite crystal thin films assisted by seeding PbS nanocrystals (NCs), using time-resolved grazing-incidence X-ray scattering. Through analyses of time-resolved crystal formation kinetics obtained from synchrotron X-rays with a fast subsecond probing time resolution, an important "catalytic" role of the seed-like PbS NCs is clearly elucidated. The perovskite precursor-capped PbS NCs are found to not only accelerate the nucleation of a highly oriented intermediate phase, but also catalyze the conversion of the intermediate phase into perovskite crystals with a reduced activation energy E a = 47 (±5) kJ mol −1 , compared to 145 (±38) kJ mol −1 for the pristine perovskite thin film. The reduced E a is attributed to a designated crystal lattice alignment of the perovskite nanocrystals with perovskite cubic crystals; the pivotal heterointerface alignment of the perovskite crystals coordinated by the Pb NCs leads to an improved film surface morphology with less pinholes and enhanced crystal texture and thermal stability. These together contribute to the significantly improved photovoltaic performance of the corresponding devices.

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Section: Introductionmentioning

confidence: 99%

Unveiling the Nanoparticle‐Seeded Catalytic Nucleation Kinetics of Perovskite Solar Cells by Time‐Resolved GIXS

Lin

Chang

et al. 2019

Adv Funct Materials

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“…In addition, the defects were also investigated by studying the energy loss in each device. The light‐intensity‐dependent V oc can provide critical insights into the mechanism of recombination processes in the PV device . At V oc , no net flow of current ( J = 0 mA cm −2 ) pass through the device, thus all the photogenerated charge carriers should recombine in the PVSK film.…”

Section: Resultsmentioning

confidence: 99%

1000 h Operational Lifetime Perovskite Solar Cells by Ambient Melting Encapsulation

Yang

Wang

et al. 2020

Advanced Energy Materials

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121

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Improving device lifetime is one of the critical challenges for the practical use of metal halide perovskite solar cells (PSCs), wherein a reliable encapsulation is indispensable. Herein, based on an in‐depth understanding of the degradation mechanism for the PSCs, a solvent‐free and low‐temperature melting encapsulation technique, by employing low‐cost paraffin as the encapsulant that is compatible with perovskite absorbers, is demonstrated. The encapsulation strategy enables the full encapsulating operations to be undertaken under an ambient environment. It is found that the strategy not only removes residual oxygen and moisture to prevent the perovskite from phase segregation, but also suppresses the species volatilization to impede absorber decomposition, enabling a PSC devices with good thermal and moisture stability. As a result, the as‐encapsulated PSCs achieve a 1000 h operational lifetime for the encapsulated device at continuous maximum power point output under an ambient environment. This work paves the way for scalable and robust encapsulation strategy feasible to hybrid perovskite optoelectronics in an economic manner.

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“…Inorganic quantum dot (QD) semiconductor materials have versatility in optoelectronic devices, for example, solar cells, light emitting diodes, and photoelectric detectors due to their high conductivity and good solution‐processability. In particular, the quantum‐size and quantum‐confinement effects enable a precise tunability of QD in terms of physical properties such as bandgaps, absorptions, and photoluminescent .…”

Section: Photovoltaic Performance Of Devices With and Without Qd‐modimentioning

confidence: 99%

Significant Efficiency Improvement Enabled by CdSe/ZnS Quantum Dot Modifier in Organic Solar Cells

Huang

Xie

et al. 2019

Solar RRL

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Interfacial engineering plays an important role to improve the photovoltaic performance of organic solar cells (OSCs). Herein, CdSe/ZnS quantum dots (QDs) are used as a cathode interlayer (CIL) modifier. By using this strategy, an enhanced power conversion efficiency (PCE) from 13.0% to 14.6% is achieved, mainly due to the increase in open‐circuit voltage (Voc) and short‐circuit current density (Jsc). A single QD layer of a proper size can reduce the defects on the surface of the active layer and smoothen the interface between the active layer and cathode. Furthermore, the low work function of the QDs with dipole moment facilitates charge transport and suppresses charge recombination at the interface by strengthening the built‐in field, thus contributing to the enhancement of PCE. The excitons generated by the QDs can also be dissociated at the IT‐4F/QD interface, which boosts the photon harvesting capability of the device. As a result, a high PCE of 14.6% is achieved for QD‐modified OSCs.

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Ligand engineering on CdTe quantum dots in perovskite solar cells for suppressed hysteresis

Cited by 47 publications

References 54 publications

Unveiling the Nanoparticle‐Seeded Catalytic Nucleation Kinetics of Perovskite Solar Cells by Time‐Resolved GIXS

Unveiling the Nanoparticle‐Seeded Catalytic Nucleation Kinetics of Perovskite Solar Cells by Time‐Resolved GIXS

1000 h Operational Lifetime Perovskite Solar Cells by Ambient Melting Encapsulation

Significant Efficiency Improvement Enabled by CdSe/ZnS Quantum Dot Modifier in Organic Solar Cells

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