Ambient condition retention of band-gap tuning in MAPbI<sub>3</sub> induced by high pressure quenching

Bonomi, Sara; Tredici, Ilenia G.; Albini, Benedetta; Galinetto, P.; Rizzo, Aurora; Listorti, Andrea; Tamburini, Umberto Anselmi; Malavasi, Lorenzo

doi:10.1039/c8cc08549h

Cited by 23 publications

(22 citation statements)

References 14 publications

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“…3 ). Moreover, MAPbI 3 does not show obvious PL change under the same pressure 32 , indicating a negligible change of bandgap (Supplementary Fig. 4 ).…”

Section: Resultsmentioning

confidence: 92%

Strain-activated light-induced halide segregation in mixed-halide perovskite solids

et al. 2020

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Light-induced halide segregation limits the bandgap tunability of mixed-halide perovskites for tandem photovoltaics. Here we report that light-induced halide segregation is strain-activated in MAPb(I1−xBrx)3 with Br concentration below approximately 50%, while it is intrinsic for Br concentration over approximately 50%. Free-standing single crystals of CH3NH3Pb(I0.65Br0.35)3 (35%Br) do not show halide segregation until uniaxial pressure is applied. Besides, 35%Br single crystals grown on lattice-mismatched substrates (e.g. single-crystal CaF2) show inhomogeneous segregation due to heterogenous strain distribution. Through scanning probe microscopy, the above findings are successfully translated to polycrystalline thin films. For 35%Br thin films, halide segregation selectively occurs at grain boundaries due to localized strain at the boundaries; yet for 65%Br films, halide segregation occurs in the whole layer. We close by demonstrating that only the strain-activated halide segregation (35%Br/45%Br thin films) could be suppressed if the strain is properly released via additives (e.g. KI) or ideal substrates (e.g. SiO2).

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“…3 ). Moreover, MAPbI 3 does not show obvious PL change under the same pressure 32 , indicating a negligible change of bandgap (Supplementary Fig. 4 ).…”

Section: Resultsmentioning

confidence: 92%

Strain-activated light-induced halide segregation in mixed-halide perovskite solids

et al. 2020

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“…Recently, quenching MAPbI 3 from a high pressure state was found to result in retention of bandgap reduction upon pressurization. 177 Partial retention of pressure-induced structural changes has also been reported for 2D perovskites. 178,179…”

Section: Influence Of Pressure On Phase Transitionsmentioning

confidence: 81%

Polymorphism in metal halide perovskites

et al. 2021

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“…Here, the A-site is usually occupied by an organic or inorganic monovalent cation, the B-site by a divalent lead cation, and the X-site by a halogen. [1,8,9] The unprecedented success of MAPbI 3 in solar cell applications is due to a plethora of optimal properties, such as a tunable and appropriate optical bandgap, [10][11][12] a high absorption coefficient, [13,14] a high carrier mobility, [15] a long carrier diffusion length, [16] an extraordinarily high defect tolerance, [17] and a low recombination loss, [18,19] which have propelled the PCE of solar cells based on the material to reach a record breaking value of 25.2% to date at the lab scale. [20] Although a large number of noteworthy developments have taken place in the research field of hybrid halide perovskites since its inception, the material still possesses a couple of major limitations, namely toxicity of lead and long-term ambient stability.…”

Section: Introductionmentioning

confidence: 99%

Defects and Their Passivation in Hybrid Halide Perovskites toward Solar Cell Applications

et al. 2020

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The rise of hybrid metal–halide perovskites as potential solar energy materials has revolutionized research on next‐generation solar cells. According to recent studies, the rationale behind such success is the rich defect physics of materials. Studies on the origin of different types of prevailing defects, their formation, and mechanism of defect passivation have hence become decisive avenues. Herein, the possible origins of defects and different defect analysis techniques in hybrid halide perovskites are discussed. While initiating the discussion with the archetypal methylammonium lead halide, perovskites beyond the conventional ABX3 structure are included. In this direction, some major advancements to date on defect formation in the bulk of hybrid halide perovskites, at the grains and grain boundaries, are summarized. Numerous effective methods to passivate the defects and the adverse effect of defects on device efficiency are further highlighted. Hence, the prospect of defect engineering in perovskite materials is pointed toward improving the power conversion efficiency and long‐term stability of perovskite solar cells (PSCs). The discussion rightfully addresses that the in‐depth exploration of defect engineering is anticipated to have a gigantic impact toward the achievement of predicted efficiency in metal–halide PSCs.

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Ambient condition retention of band-gap tuning in MAPbI₃ induced by high pressure quenching

Abstract: In the present work, we show a successful approach to achieve stable structural and optical changes induced by pressure on bulk amounts of MAPI after pressure release.

Cited by 23 publications

References 14 publications

Strain-activated light-induced halide segregation in mixed-halide perovskite solids

Strain-activated light-induced halide segregation in mixed-halide perovskite solids

Polymorphism in metal halide perovskites

Defects and Their Passivation in Hybrid Halide Perovskites toward Solar Cell Applications

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Ambient condition retention of band-gap tuning in MAPbI3 induced by high pressure quenching

Abstract: In the present work, we show a successful approach to achieve stable structural and optical changes induced by pressure on bulk amounts of MAPI after pressure release.

Cited by 23 publications

References 14 publications

Strain-activated light-induced halide segregation in mixed-halide perovskite solids

Strain-activated light-induced halide segregation in mixed-halide perovskite solids

Polymorphism in metal halide perovskites

Defects and Their Passivation in Hybrid Halide Perovskites toward Solar Cell Applications

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Product

Resources

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Ambient condition retention of band-gap tuning in MAPbI₃ induced by high pressure quenching