In situ observation of heat-induced degradation of perovskite solar cells

Divitini, Giorgio; Cacovich, Stéfania; Matteocci, Fabio; Cinà, Lucio; Carlo, Aldo Di; Ducati, Caterina

doi:10.1038/nenergy.2015.12

Cited by 682 publications

(609 citation statements)

References 30 publications

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“…To further confirm the thermal stability of the perovskite alloy and the influence of the phase transition, we performed thermal cycling tests using standard ISOS-T-1 thermal cycling. [9] Similar with previous result, MA 0. At first, MAPbI 3 -based device was extremely stable under the initial test period at 25 °C, indicating high-quality devices.…”

Section: Doi: 101002/advs201801079supporting

confidence: 88%

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

et al. 2018

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A power conversion efficiency of over 20% has been achieved in CH3NH3PbI3‐based perovskite solar cells (PSC), however, low thermal stability associated with the presence of a phase transition between tetragonal and cubic structures near room temperature is a major issue that must be overcome for future practical applications. Here, the influence of the phase transition on the thermal stability of PSCs is investigated in detail by comparing four kinds of perovskite films with different compositions of halogen atoms and organic components. Thermally stimulated current measurements reveal that a large number of carrier traps are generated in solar cells with the perovskite CH3NH3PbI3 as a light absorber after operation at 85 °C, which is higher than the phase‐transition temperature. Electrochemical impedance spectroscopy measurements further exclude effects of a possible morphology change on the formation of carrier traps. These carrier traps are detrimental to the thermal stability. The thermogravimetric analysis does not show a decomposition for any of the materials in the temperature range relevant for operation. The perovskite alloys do not have this phase transition, resulting in effectively suppressed formation of carrier traps. PSCs with improved thermal stability under the standard thermal cycling test are demonstrated.

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Section: Doi: 101002/advs201801079supporting

confidence: 88%

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

et al. 2018

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“…The BSE images in Additional file 1: Figure S3 confirm that regular ellipsoidal perovskites are clearly formed in the intended micropores. Furthermore, it is used to confirm the PbI 2 pre-coating influence on the perovskite infiltration into the mesoporous TiO 2 layer (mp-TiO 2 ) [32]. The PbI 2 pre-coating indeed do not interfere with the perovskite infiltration into the mp-TiO 2 (without PS) based on the BSE intensity comparison between Additional file 1: Figure S3(b) and (c).…”

Section: Resultsmentioning

confidence: 99%

Tailoring the Mesoscopic TiO2 Layer: Concomitant Parameters for Enabling High-Performance Perovskite Solar Cells

et al. 2017

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Architectural control over the mesoporous TiO2 film, a common electron-transport layer for organic-inorganic hybrid perovskite solar cells, is conducted by employing sub-micron sized polystyrene beads as sacrificial template. Such tailored TiO2 layer is shown to induce asymmetric enhancement of light absorption notably in the long-wavelength region with red-shifted absorption onset of perovskite, leading to ~20% increase of photocurrent and ~10% increase of power conversion efficiency. This enhancement is likely to be originated from the enlarged CH3NH3PbI3(Cl) grains residing in the sub-micron pores rather than from the effect of reduced perovskite-TiO2 interfacial area, which is supported from optical bandgap change, haze transmission of incident light, and one-diode model parameters correlated with the internal surface area of microporous TiO2 layers. With the templating strategy suggested, the necessity of proper hole-blocking method is discussed to prevent any direct contact of the large perovskite grains infiltrated into the intended pores of TiO2 scaffold, further mitigating the interfacial recombination and leading to ~20% improvement in power conversion efficiency compared with the control device using conventional solution-processed hole blocking TiO2. Thereby, the imperatives that originate from the structural engineering of the electron-transport layer are discussed to understand the governing elements for the improved device performance.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1809-7) contains supplementary material, which is available to authorized users.

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“…Perovskite device efficiencies have been shown to rapidly decrease when exposed to environmental stress parameters such as heat and moisture. [28][29][30] In the presence of either stress factor, the crystal structure decomposes into PbI 2 and the organic cation is lost: heat leads to thermally induced methylamine evolution and moisture forms a hydrated phase as methylammonium binds to water. This degradation leads to device failure and presents toxicity hazards because PbI 2 is soluble in water.…”

Section: Exposure Conditionsmentioning

confidence: 99%

Mechanical integrity of solution-processed perovskite solar cells

Rolston

Watson

Bailie

et al. 2016

Extreme Mechanics Letters

167

125

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Low-cost solar technologies such as perovskite solar cells are not only required to be efficient, but durable too, exhibiting chemical, thermal and mechanical stability. To determine the mechanical stability of perovskite solar cells, the fracture resistance of a multitude of solution-processed organometal trihalide perovskite films and cells utilizing these films were studied. The influence of stoichiometry, precursor chemistry, deposition techniques, and processing conditions on the fracture resistance of perovskite layers was investigated. In all cases the perovskites offered negligible resistance to fracture failing cohesively below 1.5 J/m 2 . The solar cells studied featured these perovskites and a variety of organic and inorganic charge transporting layers and carrier-selective contacts. These ancillary layers were found to significantly influence the overall mechanical stability of the perovskite solar cells and were repeatedly the primary source of mechanical failure, failing at values below those measured for the isolated fragile perovskite films. A detailed insight into the nature of perovskite and perovskite solar cell fracture is presented and the influence of grain size, device architecture, deposition techniques, environmental variables, and molecular additives on these fracture processes is reported. Understanding the influence of materials selection, deposition techniques and processing variables on the mechanical stability of perovskite solar cells is a crucial step in their development.

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In situ observation of heat-induced degradation of perovskite solar cells

Cited by 682 publications

References 30 publications

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

Tailoring the Mesoscopic TiO2 Layer: Concomitant Parameters for Enabling High-Performance Perovskite Solar Cells

Mechanical integrity of solution-processed perovskite solar cells

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