Effect of hydrostatic pressure on the structural phase transitions in CH3NH3PbX3(X = Cl, Br, I)

Gesi, K.

doi:10.1080/00150199708012851

Cited by 44 publications

(50 citation statements)

References 7 publications

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“…However, the phase diagram of MAPbX 3 has been reported as dT c /dp>0 [16] . The coupling between the soft rotational mode of the PbX 6 tetrahedrons and the disordered MA molecules may affect the pressure dependence of T c .…”

Section: Discussionmentioning

confidence: 99%

Disordered Configuration of Methylammonium of CH₃NH₃PbBr₃Determined by Single Crystal Neutron Diffractometry

et al. 2007

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In order to understand the mechanism of the structural phase transition in CH 3 NH 3 PbBr 3 , neutron diffraction data from the single crystal is analyzed by the least-squares method and the maximum entropy method. The disordered configuration of a methylammonium ion in a cage surrounded by eight PbBr 6 octahedrons is identified unambiguously. With comparing the low-temperature structure, the transition is characterized by the condensation of the rotational motion of the PbBr 6 octahedron around the Pb-Br axis, which accompanies the partial ordering of the methylammonium ion to reduce the site symmetry.

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Section: Discussionmentioning

confidence: 99%

Disordered Configuration of Methylammonium of CH₃NH₃PbBr₃Determined by Single Crystal Neutron Diffractometry

et al. 2007

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“…It is worth noting that the tetragonal-to-cubic phase transition temperature of MAPbI 3 is near 330 K [ 29 ] (for single crystals); accordingly, the perovskite fi lms should turn to nonferroelectric beyond this temperature point. However, our devices exhibit hysteresis I-V loops even at 360 K ( Figure S2, Supporting Information).…”

Section: Table 2 Lists the Hysteresis Index Values Extracted From Figmentioning

confidence: 99%

Native Defect‐Induced Hysteresis Behavior in Organolead Iodide Perovskite Solar Cells

Xie

et al. 2016

Adv Funct Materials

229

155

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1411wileyonlinelibrary.com current-voltage ( I-V ) characteristics in planar perovskite PV structures, where the reverse scanning (from open circuit voltage ( V oc ) to short circuit current( J sc )) current is superior to the forward scanning (from J sc to V oc ) current. [6][7][8][9][10] Three mechanisms have been proposed [ 6 ] to explain the hysteresis behavior of perovskite PV cells: charge trapping at the interface between perovskite and its neighboring charge transport layers, ferroelectric response of perovskites, and migration of interstitial or vacancy defects in perovskites. In earlier studies, ineffi cient electron extraction (i.e., electron trapping) at the perovskite/compact TiO 2 (c-TiO 2 ) interface [ 11 ] was considered as the origin of the I-V hysteresis. It was shown that by replacing c-TiO 2 with mesoporous TiO 2 [ 6,12 ] or by modifying the c-TiO 2 surface with a C 60 self-assemble monolayer, [ 13 ] the hysteresis can be reduced. On the other hand, it was noted that in the hysteretic devices the response time of photocurrent upon voltage change is in the range of seconds or longer, while trapping/detrapping of charges should happen at much faster timescales. [ 9 ] Ferroelectric polarization may occur in the perovskite devices, but this mechanism alone cannot explain the variation of hysteresis upon interface modifi cation [ 13 ] and the absence of hysteresis in some planar PV structures, such as indium tin oxide (ITO) /poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/ perovskite/phenyl-C61-butyric acid methyl ester (PCBM)/ C 60 /2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)/Al. [ 14 ] Recently, migration of ionic defects (e.g., Ii i or V i MA ) has been associated with the hysteresis behavior. [ 9,[15][16][17][18][19][20][21][22][23] Huang and coworkers demonstrated a giant switchable photovoltaic effect in both ITO/PEDOT:PSS/MAPbI 3 /gold (Au) [ 15 ] and lateral Au/ MAPbI 3 /Au [ 17 ] structures and explained the phenomenon by migration of methylammonium ions (MA + ) based on photothermal induced resonance measurement results. [ 17 ] Yang et al. investigated specifi cally the ionic conductivity of lead iodidebased perovskites by employing electrochemical cells, [ 18 ] and they found that the ion conduction is largely contributed by iodide ions (I − ). Eames et al. estimated the active energy of I − migration in MAPbI 3 to be 0.6 eV through chronophotoamperometry measurement of a fl ourine-doped tin oxide (FTO)/cTiO 2 /MAPbI 3 /spiro-OMeTAD/Au structure; [ 19 ]

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“…No specific signature of E g has been observed for the transition from the tetragonal to the orthorhombic phases at around -111°C 8, 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 dependence of the band gap of free CH 3 NH 3 PbI 3 crystals and of CH 3 NH 3 PbI 3 in stacked layer systems such as PMMA/CH 3 NH 3 PbI 3 .…”

mentioning

confidence: 96%

“…E g-tp and E g-Tauc increased steeply by 0.01 eV between 32°C and 40°C and decreased to 1.569 at 50°C and 1.567 at 60°C. The steep increase of E g-tp and E g-Tauc between 32°C and 40°C shall be related to the phase transition from the tetragonal to the cubic phases at 54°C 8, 25 . It is known from literature that the transition temperature from the tetragonal to the cubic phases decreases with increasing pressure 25 .…”

mentioning

confidence: 99%

Temperature Dependence of the Band Gap of CH₃NH₃PbI₃ Stabilized with PMMA: A Modulated Surface Photovoltage Study

et al. 2015

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CH 3 NH 3 PbI 3 layers chemically stabilized with poly(methyl methacrylate) (PMMA), relevant for photovoltaic applications, have been investigated by modulated surface photovoltage (SPV) spectroscopy at temperatures (T) between −182 and 60 °C. SPV is sensitive only to the PMMA/CH 3 NH 3 PbI 3 interface region where photogeneration and charge separation take place. The T dependencies of the Tauc gap (E g-Tauc , equivalent to absorption measurements) and of the gap determined from the maximum slope (E g-tp , almost at increased absorption) were analyzed on the basis of the in-phase SPV spectra. At 32 °C, the values of E g-Tauc and E g-tp were 1.540 and 1.560 eV, respectively. A jump of E g-Tauc and E g-tp by 10 meV at 40 °C was interpreted as the transition from the tetragonal to the cubic phase at T lower than values known from literature. E g-Tauc and E g-tp of the cubic phase decreased with increasing T. In contrast, E g-Tauc and E g-tp of the tetragonal phase decreased moderately with decreasing T to 1.528 and 1.546 eV at −182 °C, respectively. No signature has been observed in E g-Tauc and E g-tp for the transition from the tetragonal to the orthorhombic phase. Structural interactions at PMMA/CH 3 NH 3 PbI 3 interfaces seem important for phase transitions in CH 3 NH 3 PbI 3 layers.

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Effect of hydrostatic pressure on the structural phase transitions in CH₃NH₃PbX₃(X = Cl, Br, I)

Cited by 44 publications

References 7 publications

Disordered Configuration of Methylammonium of CH₃NH₃PbBr₃Determined by Single Crystal Neutron Diffractometry

Disordered Configuration of Methylammonium of CH₃NH₃PbBr₃Determined by Single Crystal Neutron Diffractometry

Native Defect‐Induced Hysteresis Behavior in Organolead Iodide Perovskite Solar Cells

Temperature Dependence of the Band Gap of CH₃NH₃PbI₃ Stabilized with PMMA: A Modulated Surface Photovoltage Study

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Effect of hydrostatic pressure on the structural phase transitions in CH3NH3PbX3(X = Cl, Br, I)

Cited by 44 publications

References 7 publications

Disordered Configuration of Methylammonium of CH3NH3PbBr3Determined by Single Crystal Neutron Diffractometry

Disordered Configuration of Methylammonium of CH3NH3PbBr3Determined by Single Crystal Neutron Diffractometry

Native Defect‐Induced Hysteresis Behavior in Organolead Iodide Perovskite Solar Cells

Temperature Dependence of the Band Gap of CH3NH3PbI3 Stabilized with PMMA: A Modulated Surface Photovoltage Study

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Effect of hydrostatic pressure on the structural phase transitions in CH₃NH₃PbX₃(X = Cl, Br, I)

Disordered Configuration of Methylammonium of CH₃NH₃PbBr₃Determined by Single Crystal Neutron Diffractometry

Disordered Configuration of Methylammonium of CH₃NH₃PbBr₃Determined by Single Crystal Neutron Diffractometry

Temperature Dependence of the Band Gap of CH₃NH₃PbI₃ Stabilized with PMMA: A Modulated Surface Photovoltage Study