Light and Thermally Induced Evolutional Charge Transport in CH3NH3PbI3 Perovskite Solar Cells

Peng, Jinrong; Sun, Yong; Chen, Yani; Yao, Yao; Liang, Ziqi

doi:10.1021/acsenergylett.6b00393

Cited by 24 publications

(44 citation statements)

References 43 publications

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“…11A and B). 28 A similar conclusion was drawn by another modified CELIV measurement. 26 It was found that in both planar and mesoporous MAPbI 3 devices all the remaining trapped carriers disappeared after a photogeneration-extraction sequence, which suggested the absence of deep traps in perovskites.…”

Section: View Article Onlinesupporting

confidence: 75%

“…4A). 28 It was found that both hole and electron mobilities were gradually increased upon light soaking (Fig. 4B).…”

Section: Devices With Electrodesmentioning

confidence: 87%

“…11C and D). 28 Balanced charge transport and unchanged electrical conductivity were finally achieved during phase transition at 310-330 K, resulting in the highest PCE. A similar phenomenon was observed in the Hall measurement of MAPbBr 3 single crystals.…”

Section: View Article Onlinementioning

confidence: 99%

“…This result was well consistent with the rapid switch of TOF hole and electron mobilities during the same phase transition in MAPbI 3 solar cells. 28 The Hall effect technique is an all-round steady-state method to simultaneously acquire the bulk charge mobility, free carrier density, electrical conductivity and diffusion length of both perovskite films and single crystals. Meanwhile, the doping effect of perovskites with different chemical compositions can also be examined by this method.…”

Section: View Article Onlinementioning

confidence: 99%

“…There are various strategies to evaluate the trap states of perovskites. For example, the TOF method is a powerful transient method to make qualitative analysis about both shallow and deep trap states, 28 while the SCLC technique is a commonly used steady-state method to obtain trap densities in perovskite polycrystalline films or single crystals. 29,30 In addition, the capacitance (C)-frequency ( f ) technique, low-frequency noise measurements, and the spatially resolved and correlated emission/ absorption method can also be applied to measure the defect densities of perovskites.…”

Section: View Article Onlinementioning

confidence: 99%

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Insights into charge carrier dynamics in organo-metal halide perovskites: from neat films to solar cells

et al. 2017

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Organo-metal halide perovskites have recently obtained world-wide attention as promising solar cell materials. They have broad and strong light absorption along with excellent carrier transport properties which partially explain their record power conversion efficiencies above 22%. However, the basic understanding of the underlying physical mechanisms is still limited and there remain large discrepancies among reported transport characteristics of perovskite materials. Notably, the carrier mobility of perovskite samples either in thin films or within solar cells obtained using different techniques can vary by up to 7-8 orders of magnitude. This tutorial review aims to offer insights into the scope, advantages, limitations and latest developments of the techniques that have been applied for studying charge carrier dynamics in perovskites. We summarize a comprehensive set of measurements including (1) time-resolved laser spectroscopies (transient absorption, time-resolved photoluminescence, terahertz spectroscopy and microwave conductivity); (2) electrical transient techniques (charge extraction by linearly increasing voltage and time-of-flight); and (3) steady-state methods (field-effect transistor, Hall effect and space charge limited current). Firstly, the basics of the above measurements are described. We then comparatively summarize the charge carrier characteristics of perovskite-based neat films, bilayer films and solar cells. Finally, we compare the different approaches in evaluating the key parameters of transport dynamics and unravel the reasons for the large discrepancies among these methods. We anticipate that this tutorial review will serve as the entry point for understanding the experimental results from the above techniques and provide insights into charge carrier dynamics in perovskite materials and devices.

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Section: View Article Onlinesupporting

confidence: 75%

“…4A). 28 It was found that both hole and electron mobilities were gradually increased upon light soaking (Fig. 4B).…”

Section: Devices With Electrodesmentioning

confidence: 87%

Section: View Article Onlinementioning

confidence: 99%

Section: View Article Onlinementioning

confidence: 99%

Section: View Article Onlinementioning

confidence: 99%

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Insights into charge carrier dynamics in organo-metal halide perovskites: from neat films to solar cells

et al. 2017

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Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells

et al. 2017

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In the present study, random current fluctuations measured at different temperatures and for different illumination levels are used to understand the charge carrier kinetics in methylammonium lead iodide CH3NH3PbI3‐based perovskite solar cells. A model, combining trapping/detrapping, recombination mechanisms, and electron–phonon scattering, is formulated evidencing how the presence of shallow and deeper band tail states influences the solar cell recombination losses. At low temperatures, the observed cascade capture process indicates that the trapping of the charge carriers by shallow defects is phonon assisted directly followed by their recombination. By increasing the temperature, a phase modification of the CH3NH3PbI3 absorber layer occurs and for temperatures above the phase transition at about 160 K the capture of the charge carrier takes place in two steps. The electron is first captured by a shallow defect and then it can be either emitted or thermalize down to a deeper band tail state and recombines subsequently. This result reveals that in perovskite solar cells the recombination kinetics is strongly influenced by the electron–phonon interactions. A clear correlation between the morphological structure of the perovskite grains, the energy disorder of the defect states, and the device performance is demonstrated.

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From Sunrise to Sunset: Unraveling Metastability in Perovskite Solar Cells by Coupled Outdoor Testing and Energy Yield Modelling

Remec,

Tomšič,

Khenkin

et al. 2024

Advanced Energy Materials

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Perovskite‐based solar cells exhibit peculiar outdoor performance which is not yet fully understood. The results of outdoor tests may contain hidden, but valuable information that cannot be fully extracted from measurements alone. One such phenomenon is the effect of nighttime degradation and the subsequent light‐soaking recovery, which can take from a few hours in the morning up to the entire day. In this work, long‐term outdoor monitoring is combined with energy yield modeling to qualitatively and quantitatively investigate the effect of light‐soaking recovery in both single junction and tandem perovskite‐based devices. Following the novel methodology presented in this study, it is observed that the light‐soaking effect depends not only on the daily irradiation but also on the device temperature, and it can be described using a simple empirical formalism. Incorporating this dependency into the energy yield model results in an excellent agreement between the simulated and the measured outdoor data, which allows to perform long‐term prediction studies. The model estimates that the light‐soaking metastability effect decreases the attainable annual energy yield by up to ≈5% for the studied single junction devices, and for tandems by up to ≈3%, depending on the geographical location, and even more for non‐optimal device orientation.

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Light and Thermally Induced Evolutional Charge Transport in CH₃NH₃PbI₃ Perovskite Solar Cells

Cited by 24 publications

References 43 publications

Insights into charge carrier dynamics in organo-metal halide perovskites: from neat films to solar cells

Insights into charge carrier dynamics in organo-metal halide perovskites: from neat films to solar cells

Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells

From Sunrise to Sunset: Unraveling Metastability in Perovskite Solar Cells by Coupled Outdoor Testing and Energy Yield Modelling

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