Lattice anchoring stabilizes solution-processed semiconductors

Liu, Mengxia; Chen, Yuelang; Tan, Charlie; Quintero-Bermúdez, Rafael; Proppe, Andrew H.; Munir, Rahim; Tan, Hairen; Voznyy, Oleksandr; Scheffel, Benjamin; Walters, Grant; Kam, Andrew Pak Tao; Sun, Bin; Choi, Min; Hoogland, Sjoerd; Amassian, Aram; Kelley, Shana O.; Arquer, F. Pelayo Garcı́a de; Sargent, Edward H.

doi:10.1038/s41586-019-1239-7

Cited by 241 publications

(240 citation statements)

References 34 publications

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“…We determined the energy level of Cl-CDs by CV based on the previous reports. [45] We thus assume the matched energy level accounts for the steady-state PL quenching, decreased PL lifetime, and the effective charge separation between perovskite and Cl-CDs, which is consistent with the devices modified by semiconductor molecules reported by Liu's group. Based on the optical bandgap of Cl-CDs (3.02 eV) ( Figure S4b, Supporting Information), the highest occupied molecular orbital (HOMO) value is calculated to be −7.13 eV.…”

Section: Effects Of Anti-colloidal-solution On Metal Halide Perovskitsupporting

confidence: 84%

Laser‐Generated Nanocrystals in Perovskite: Universal Embedding of Ligand‐Free and Sub‐10 nm Nanocrystals in Solution‐Processed Metal Halide Perovskite Films for Effectively Modulated Optoelectronic Performance

Guo

Yang

Qian

et al. 2019

Advanced Energy Materials

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Regulating the chemical/physical features of solution processed metal halide perovskite films by integrating sub‐10 nm nanocrystals is a highly promising strategy to advance their outstanding optoelectronic performance. However, significant challenges remain for the universal embedding of the well‐defined nanocrystals in the film matrix. By generating nanocrystals in desired solvents via pulsed laser irradiation in liquid, the authors demonstrate the effective decoration of sub‐10 nm nanocrystals in perovskite films for enhanced optoelectronic performance. It is believed that this improved performance is due to the modification of the widely adopted “antisolvent” to a novel “anti‐colloidal‐solution” (ACS). Exemplified by a typical ACS; carbon dots in chlorobenzene, its encouraging superiority in regulating, not only the films morphology, but also the electronic structure, is demonstrated. This results in perovskite solar cells with a champion efficiency of 21.41% as well as a pronounced stability over 5000 h in relative humidity of 40%. The capability of nanocrystal embedding for boosted photovoltaic performance is further exploited by employing other laser generated ACSs. Such a strategy may open up a route to regulating hybrid perovskite film performance via nanocrystal embedding for photovoltaics or even beyond optoelectronic applications.

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Section: Effects Of Anti-colloidal-solution On Metal Halide Perovskitsupporting

confidence: 84%

Laser‐Generated Nanocrystals in Perovskite: Universal Embedding of Ligand‐Free and Sub‐10 nm Nanocrystals in Solution‐Processed Metal Halide Perovskite Films for Effectively Modulated Optoelectronic Performance

Guo

Yang

Qian

et al. 2019

Advanced Energy Materials

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“…Such heterogeneous crystal interface alignment would enhance the film texture (Figure ) of the perovskite film embedded with the PbS NCs. This is similar to the “dots‐in‐a‐matrix” crystals consisting of atomically aligned interfaces of PbS NCs within a MAPbI 3 perovskite matrix, illustrated in previous reports . Accordingly, we attribute the significantly larger grain sizes of the PbS‐seeded perovskite film shown in Figure to better packed and lattice‐aligned perovskite crystals around the PbS NC seed.…”

Section: Introductionmentioning

confidence: 97%

“…The photoactive α phase of FA x MA 1− x PbI 3 is known to transit relatively easily to the photoinactive yellow orthorhombic δ phase at room temperature . Indeed, a similar lattice anchoring effect of PbS nanoparticles was reported (parallel to this study) to impressively enhance the stability of the cubic phase of cesium lead halide perovskites …”

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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“…They revealed that DMAI could control the perovskite's phase and crystallinity and was completely removed in the annealing process. Besides large‐size amine cations, quantum dots have also been applied to stabilize CsPbI 3 significantly via lattice anchoring . More interestingly, strain was also applied to stabilize CsPbI 3 , indicating considering and utilizing localized energy distribution is quite important for halide perovskites …”

Section: Stabilizing Perovskite Phasementioning

confidence: 99%

A Review on Additives for Halide Perovskite Solar Cells

Liu

Guan

Sheng

et al. 2019

Advanced Energy Materials

300

240

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Additives are widely adopted for efficient, stable, and hysteresis‐free perovskite solar cells and play an important role in various breakthroughs of perovskite solar cells (PSCs). Herein the various additives adopted for PSCs are reviewed and their functioning mechanism and influence on device performance is described. The main roles of additives, modulating morphology of perovskite films, stabilizing phase of formamidinium (FA) and cesium (Cs)‐based perovskites, adjusting energy level alignment in PSCs, suppressing nonradiative recombination in perovskites, eliminating hysteresis, enhancing operational stability of PSCs, are summarized.

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Lattice anchoring stabilizes solution-processed semiconductors

Cited by 241 publications

References 34 publications

Laser‐Generated Nanocrystals in Perovskite: Universal Embedding of Ligand‐Free and Sub‐10 nm Nanocrystals in Solution‐Processed Metal Halide Perovskite Films for Effectively Modulated Optoelectronic Performance

Laser‐Generated Nanocrystals in Perovskite: Universal Embedding of Ligand‐Free and Sub‐10 nm Nanocrystals in Solution‐Processed Metal Halide Perovskite Films for Effectively Modulated Optoelectronic Performance

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

A Review on Additives for Halide Perovskite Solar Cells

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