Role of phase composition for electronic states in CH3NH3PbI3 prepared from CH3NH3I/PbCl2 solution

Naikaew, Atittaya; Prajongtat, Pongthep; Lux‐Steiner, Martha Ch.; Arunchaiya, Marisa; Dittrich, Thomas

doi:10.1063/1.4922554

Cited by 35 publications

(38 citation statements)

References 19 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These peaks could be correlated to the (100) and (200) diffraction peaks of CH 3 NH 3 PbCl 3 which is in agreement with previous reports [25]. It was interesting that the coating of PMMA on top of perovskite layer could significantly reduce the amount of CH 3 NH 3 PbCl 3 in the final perovskite films [29]. The peak at 40.47 • appeared in all the samples even without perovskite.…”

Section: Resultssupporting

confidence: 79%

“…Perovskite coated with 0 mg/mL of PMMA, a change of sign after the first day of storage in air was observed and an impurity phase of PbI 2 at around 2.3 eV [21] appeared as the storage time in air increased. This implied that perovskite degraded to PbI 2 with CH 3 NH 3 I evaporating from the surface due to interaction with air and moisture [29]. This was also confirmed by the GIXRD spectrum that PbI 2 peak appeared at 12.67 • [25] after exposure to air for more than one day.…”

Section: Resultssupporting

confidence: 65%

“…Close to E g for the as-prepared sample, and after 43 days of storage in air, both in-phase and phase-shifted by 90 • signals were positive, indicating that photo-generated holes are preferentially separated towards the sample surface while electrons towards the bulk (substrate) [29]. Furthermore, the phase shifted by 90 • signal was smaller in magnitude compared to in-phase signal.…”

Section: Resultsmentioning

confidence: 87%

See 2 more Smart Citations

Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract:Studies have shown that perovskites have a high potential of outdoing silicon based solar cells in terms of solar energy conversion, but their rate of degradation is also high. This study reports on improvement on the stability of CH 3 NH 3 PbI 3 by passivating it with polymethylmethacrylate (PMMA). Structural and electronic properties of CH 3 NH 3 PbI 3 stabilized by polymethylmethacrylate (PMMA) were investigated by varying concentrations of PMMA in the polymer solutions. Stability tests were performed over a period of time using modulated surface photovoltage (SPV) spectroscopy, X-ray diffraction (XRD), and photoluminescence (PL) measurements. The XRD patterns confirm the tetragonal structure of the deposited CH 3 NH 3 PbI 3 for every concentration of PMMA. Furthermore, CH 3 NH 3 PbI 3 coated with 40 mg/mL of PMMA did not show any impurity phase even after storage in air for 43 days. The Tauc gap (E Tauc ) determined on the basis of the in-phase SPV spectra was found in the range from 1.585 to 1.62 eV for the samples stored during initial days, but shifted towards lower energies as the storage time increased. This can be proposed to be due to different chemical reactions between CH 3 NH 3 PbI 3 /PMMA interfaces and air. PL intensity increased with increasing concentration of PMMA except for the perovskite coated with 40 mg/mL of PMMA. PL quenching in the perovskite coated with 40 mg/mL of PMMA can be interpreted as fast electron transfer towards the substrate in the sample. This study shows that, with an optimum concentration of PMMA coating on CH 3 NH 3 PbI 3 , the lifetime and hence stability on electrical and structural behavior of CH 3 NH 3 PbI 3 is improved.

show abstract

Section: Resultssupporting

confidence: 79%

Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 87%

See 1 more Smart Citation

Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The in‐phase or x‐signal (black filled circles) and phase‐shifted by 90° or y‐signal (black unfilled circles) are related to fast or slow response to the light source. A negative or positive sign of the in‐phase signal means that photo‐generated electrons are separated preferentially towards the external (direction towards to mica) or internal (direction towards to FTO) interface . All perovskite samples showed the negative sign in x‐signals indicating the p‐type characteristics in depletion region .…”

Section: Resultsmentioning

confidence: 99%

Enhancing High Humidity Stability of Quasi‐2D Perovskite Thin Films through Mixed Cation Doping and Solvent Engineering

Naikaew

Kumnorkaew

Supasai³

et al. 2019

ChemNanoMat

Self Cite

View full text Add to dashboard Cite

Perovskite materials show excellent photovoltaic performance along with simple processing and low‐energy requirements. Despite their high power conversion efficiency (PCE), instability in the presence of moisture is still a major challenge. An effective method to enhance perovskite stability is by reducing dimensionality through incorporation of long organic cations into the perovskite crystal, which improves charge‐carrier extraction efficiency of the perovskites compared to conventional 3D perovskites. Quasi‐2D perovskites or 2D/3D perovskites strike a good balance between PCE and stability, having much improved stability compared to 3D structures while retaining excellent optoelectronic properties. Yielding better thermal stability and broader absorption into the near‐infrared, formamidinium iodide (FAI) doping has positive influences yet tends to cause poor surface morphology. Here, we introduce highly stable MA/FA‐based quasi‐2D perovskite fabricated by mixed cation doping (MCD), which is repeated deposition of MA and FA cations onto a quasi‐2D perovskite layer. MCD enables better morphology and surface passivation, leading to fewer defects. MA/FA‐based quasi‐2D perovskite with quasi‐cubic structure has high humidity resistivity, remaining intact after 90 days under 60% relative humidity without encapsulation. The underlying mechanism is further explained by binding and formation energies of cation mixture in solution and perovskite structure through computational analysis.

show abstract

“…Charge separation and transport length (L) of photo-generated charge carriers were studied by SPV measurements. [34][35][36][37] In the measurement of L, the SPV signal is kept constant whereas the light intensity is plotted depending on the absorption length (Goodman plot). The intersection point of the corresponding linear t gives the negative value of L. 36,37 PL was measured using lasers of two wavelengths, 362 nm and 504 nm.…”

Section: Characterizationmentioning

confidence: 99%

Enhancement of photocurrent in an ultra-thin perovskite solar cell by Ag nanoparticles deposited at low temperature

et al. 2017

Self Cite

View full text Add to dashboard Cite

Ultra-thin perovskite absorber layers have attracted increasing interest since they are suitable for application in semi-transparent perovskite and tandem solar cells. In this study, size and density controlled plasmonic silver nanoparticles are successfully incorporated into ultra-thin perovskite solar cells through a low temperature spray chemical vapor deposition method. Incorporation of Ag nanoparticles leads to a significant enhancement of 22.2% for the average short-circuit current density. This resulted in a relative improvement of 22.5% for the average power conversion efficiency. Characterization by surface photovoltage and photoluminescence provides evidence that the implemented silver nanoparticles can enhance the charge separation and the trapping of electrons into the TiO 2 layer at the CH 3 NH 3 PbI 3 /TiO 2 interface. The application of these silver nanoparticles therefore has promise to enhance the ultra-thin perovskite solar cells.

show abstract

Role of phase composition for electronic states in CH3NH3PbI3 prepared from CH3NH3I/PbCl2 solution

Cited by 35 publications

References 19 publications

Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)

Investigation of Structural and Electronic Properties of CH3NH3PbI3 Stabilized by Varying Concentrations of Poly(Methyl Methacrylate) (PMMA)

Enhancing High Humidity Stability of Quasi‐2D Perovskite Thin Films through Mixed Cation Doping and Solvent Engineering

Enhancement of photocurrent in an ultra-thin perovskite solar cell by Ag nanoparticles deposited at low temperature

Contact Info

Product

Resources

About