Charge transport in a two-dimensional hybrid metal halide thiocyanate compound

Labram, John G.; Venkatesan, Naveen R.; Takacs, Christopher J.; Evans, Hayden A.; Perry, Erin E.; Wudl, Fred; Chabinyc, Michael L.

doi:10.1039/c7tc01161j

Cited by 36 publications

(47 citation statements)

References 102 publications

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“…RC In our case t » 20 RC ns in all cases. The lifetime as determined by TRMC depends on the carrier concentration, and hence the relative contribution from bimolecular and Auger recombination [44], but values in the range of a few 100 ns are common for polycrystalline MHP films at typical TRMC fluences [38,45]. Figure 2(c) shows an example transient of a film of lead iodide (PbI 2 ), prepared using previously reported solution-deposition protocols [41], and not subjected to extended annealing.…”

Section: Resultsmentioning

confidence: 99%

“…The fact that we could not detect a photoconductance for samples annealed at 110°C and over, but could for pristine PbI 2 , suggests that the PbI 2 sheets are likely to be disrupted by other decomposition products, in addition to reduced coverage. Unlike the 3-dimensional perovskite structure formed of corner connected octahedra, PbI 2 is a layered compound, suggesting its in-plane mobility is likely to be substantially different from its out of plane mobility [38,48,49]. Cavity-based TRMC measures the electronic properties of charge carriers in the plane of the sample.…”

Section: Resultsmentioning

confidence: 99%

“…An external trigger link is employed to trigger the oscilloscope before the laser fires. The photoconductance was evaluated from changes in the detector voltage using standard analysis [38][39][40]. All measurements were conducted in air, without encapsulation, in the under-coupled regime 2.3.…”

Section: Time-resolved Microwave Conductivity (Trmc)mentioning

confidence: 99%

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Thermal stability of mobility in methylammonium lead iodide

et al. 2019

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Metal halide perovskites (MHPs) are a fascinating class of photovoltaic materials; possessing distinctive optoelectronic properties and simple processing routes. The most significant remaining barrier to commercialization is their poor stability under ambient conditions. While the stability of electronic parameters in this class of material has been studied extensively, to date the overwhelming majority of such studies have been carried out using PV devices. The presence of electrodes and transport layers in this approach involves both implicit encapsulation, and modification of interface properties. To develop an extensive understanding of environmental stability of electronic properties in MHPs, it is crucial to study the electronic properties of the material in isolation, rather than in a finished device. In this work, we have studied the thermal stability of electronic properties of solution processed methylammonium lead iodide (MAPbI 3 ). MAPbI 3 thin films were subjected to extended periods of elevated temperatures before their electronic properties were probed using time-resolved microwave conductivity (TRMC), a contactless technique enabling extraction of a proxy for the material's mobility, without the need to form a device. The films were analysed with x-ray absorption spectroscopy (XAS) to study the impact of temperature on film microstructure. We observed an increase in average Pb-I bond length with increased annealing temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Thermal stability of mobility in methylammonium lead iodide

et al. 2019

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“…An external trigger link is employed to trigger the oscilloscope before the laser fires. The photoconductance was evaluated from changes in the detector voltage using standard analysis as described in our previous works (49)(50)(51). All the measurements were conducted in air, without encapsulation, in the over-coupled regime.…”

Section: Time-resolved Microwave Conductivity Characterizationmentioning

confidence: 99%

A piperidinium salt stabilizes efficient metal-halide perovskite solar cells

Lin

Sakai

et al. 2020

Science

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523

365

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Longevity has been a long-standing concern for hybrid perovskite photovoltaics. We demonstrate high-resilience positive-intrinsic-negative perovskite solar cells by incorporating a piperidinium-based ionic compound into the formamidinium-cesium lead-trihalide perovskite absorber. With the bandgap tuned to be well suited for perovskite-on-silicon tandem cells, this piperidinium additive enhances the open-circuit voltage and cell efficiency. This additive also retards compositional segregation into impurity phases and pinhole formation in the perovskite absorber layer during aggressive aging. Under full-spectrum simulated sunlight in ambient atmosphere, our unencapsulated and encapsulated cells retain 80 and 95% of their peak and post-burn-in efficiencies for 1010 and 1200 hours at 60° and 85°C, respectively. Our analysis reveals detailed degradation routes that contribute to the failure of aged cells.

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“…20-90 ns) to (MA) 2 Pb (SCN) 2 I 2 (n = 1, ca. 100 ns) 74 and (BA) 2 (MA) n-1 Pb n I 3n+1 (n = 4-5, ca. 100-200 ns) 72 .…”

Section: Synthesis Of Layered Formamidinium Metal Halide Perovskitesmentioning

confidence: 99%

Reversible multicolor chromism in layered formamidinium metal halide perovskites

et al. 2020

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Metal halide perovskites feature crystalline-like electronic band structures and liquid-like physical properties. The crystal–liquid duality enables optoelectronic devices with unprecedented performance and a unique opportunity to chemically manipulate the structure with low energy input. In this work, we leverage the low formation energy of metal halide perovskites to demonstrate multicolor reversible chromism. We synthesized layered Ruddlesden-Popper FAn+1PbnX3n+1 (FA = formamidinium, X = I, Br; n = number of layers = 1, 2, 3 … ∞) and reversibly tune the dimensionality (n) by modulating the strength and number of H-bonds in the system. H-bonding was controlled by exposure to solvent vapor (solvatochromism) or temperature change (thermochromism), which shuttles FAX salt pairs between the FAn+1PbnX3n+1 domains and adjacent FAX “reservoir” domains. Unlike traditional chromic materials that only offer a single-color transition, FAn+1PbnX3n+1 films reversibly switch between multiple colors including yellow, orange, red, brown, and white/colorless. Each colored phase exhibits distinct optoelectronic properties characteristic of 2D superlattice materials with tunable quantum well thickness.

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Charge transport in a two-dimensional hybrid metal halide thiocyanate compound

Abstract: Time-resolved microwave conductivity reveals good carrier mobility and long carrier lifetimes in the layered organic metal halide compound (CH3NH3)2Pb(SCN)2I2.

Cited by 36 publications

References 102 publications

Thermal stability of mobility in methylammonium lead iodide

Thermal stability of mobility in methylammonium lead iodide

A piperidinium salt stabilizes efficient metal-halide perovskite solar cells

Reversible multicolor chromism in layered formamidinium metal halide perovskites

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