Interpreting time-resolved photoluminescence of perovskite materials

Péan, Emmanuel V.; Dimitrov, Stoichko D.; Castro, Catherine S. P. De; Davies, Matthew L.

doi:10.1039/d0cp04950f

Cited by 122 publications

(127 citation statements)

References 41 publications

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“…The signal decays when the material undergoes electron–hole recombination (longer lifetime, τ 1 ) and charge transfer/trapping (shorter lifetime, τ 2 ). 52,53 Cu 1 /TiO 2 (0.21) has a smaller average lifetime (0.477 ns) than pure TiO 2 (0.711 ns), suggesting that an electron is transferred from TiO 2 to Cu (Fig. S16, ESI†).…”

Section: Resultsmentioning

confidence: 99%

Electronic interaction between transition metal single-atoms and anatase TiO₂ boosts CO₂ photoreduction with H₂O

Lee

Gong

Kim

et al. 2022

Energy Environ. Sci.

108

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Section: Resultsmentioning

confidence: 99%

Electronic interaction between transition metal single-atoms and anatase TiO₂ boosts CO₂ photoreduction with H₂O

Lee

Gong

Kim

et al. 2022

Energy Environ. Sci.

108

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“…Interestingly, the PL decay of the pristine sample needs to be fitted using a triexponential function rather than a biexponential function. The three-lifetime components of the pristine sample can be associated with Shockley–Read–Hall (SRH) recombination via defect trappings, radiative recombination of free electrons/holes, and Auger recombination [ 34 , 35 ]. The lifetime decay components , , and in the pristine sample were 3.34, 19.82, and 76.75 ns, respectively.…”

Section: Resultsmentioning

confidence: 99%

Surface Treatment of Inorganic CsPbI3 Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

et al. 2022

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The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic material. In particular, nanocrystals (NCs) of inorganic perovskites have demonstrated excellent performance for light-emitting and display applications. However, the presence of surface defects on the NCs negatively impacts their performance in devices. Herein, we report a compatible facial post-treatment of CsPbI3 nanocrystals using guanidinium iodide (GuI). It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium cation. As a consequence, the film of treated CsPbI3 nanocrystals exhibited significantly enhanced luminescence and charge transport properties, leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8% with high brightness (peak luminance of 7039 cd m−2 and a peak current density of 10.8 cd A−1). The EQE is over threefold higher than performance of untreated device (EQE: 3.8%). The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min (at current density of 25 mA cm−2), outperforming the untreated devices (T50 ~ 6 min).

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“…Despite the similar decay time between MY‐DWNT and HY‐DWNT, tau 1 (τ 1 ) from the MY‐DWNT sample was slightly lower than HY‐DWNT, which may indicate marginally better charge transfer in the MY‐DWNT sample. [ 50 ]…”

Section: Resultsmentioning

confidence: 99%

Large‐Diameter Carbon Nanotube Transparent Conductor Overcoming Performance–Yield Tradeoff

Zhang

Nam

Han

et al. 2021

Adv Funct Materials

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The floating catalyst chemical vapor deposition (FCCVD) method for producing single‐walled carbon nanotubes (SWNTs) has demonstrated great potential in transparent conductive film (TCF) application. In FCCVD, reducing the concentration of carbon nanotubes (CNTs) is a well‐agreed method of improving the conductivity of SWNT TCF, achieved by producing thinner and longer CNT bundles. However, this method decreases the yield dramatically, which has persisted throughout the TCF development. Here, the production of large‐diameter double‐walled CNT (DWNT) TCFs via FCCVD is reported, which overcomes the tradeoff between performance and yield. These TCFs of DWNTs with an average diameter of ≈4 nm have a low sheet resistance of 35 Ω sq−1 at 90% transmittance. The conductivity here aligns with the best‐performing SWNT TCFs reported to date, showing a production yield greater than two orders of magnitude. The main factor contributing to the high performance and yield is considered to be the large tube diameter, which greatly improves the yield threshold of CNT bundling and leads to long tube length and unique junctions broadening. Moreover, the application of DWNT TCFs in perovskite solar cells exhibits a power conversion efficiency of 17.4%, which has not been reported yet in indium‐free CNT‐based solar cells.

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Interpreting time-resolved photoluminescence of perovskite materials

Abstract: Time-resolved photoluminescence (TRPL) spectroscopy is a powerful technique to investigate excited charge carrier recombinations in semiconductors and molecular systems. The analysis of the TRPL decays of many molecular systems (e.g....

Cited by 122 publications

References 41 publications

Electronic interaction between transition metal single-atoms and anatase TiO₂ boosts CO₂ photoreduction with H₂O

Electronic interaction between transition metal single-atoms and anatase TiO₂ boosts CO₂ photoreduction with H₂O

Surface Treatment of Inorganic CsPbI3 Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

Large‐Diameter Carbon Nanotube Transparent Conductor Overcoming Performance–Yield Tradeoff

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Interpreting time-resolved photoluminescence of perovskite materials

Abstract: Time-resolved photoluminescence (TRPL) spectroscopy is a powerful technique to investigate excited charge carrier recombinations in semiconductors and molecular systems. The analysis of the TRPL decays of many molecular systems (e.g....

Cited by 122 publications

References 41 publications

Electronic interaction between transition metal single-atoms and anatase TiO2 boosts CO2 photoreduction with H2O

Electronic interaction between transition metal single-atoms and anatase TiO2 boosts CO2 photoreduction with H2O

Surface Treatment of Inorganic CsPbI3 Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

Large‐Diameter Carbon Nanotube Transparent Conductor Overcoming Performance–Yield Tradeoff

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Electronic interaction between transition metal single-atoms and anatase TiO₂ boosts CO₂ photoreduction with H₂O

Electronic interaction between transition metal single-atoms and anatase TiO₂ boosts CO₂ photoreduction with H₂O