Correlation between hysteresis dynamics and inductance in hybrid perovskite solar cells: studying the dependency on ETL/perovskite interfaces

Yekani, Rana; Chiu, Hsien‐Chieh; Strandell, Dallas; Wang, Zhuoran; Bessette, Stéphanie; Gauvin, Raynald; Kambhampati, Patanjali; Demopoulos, George P.

doi:10.1039/d2nr05836g

Cited by 6 publications

(10 citation statements)

References 55 publications

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“…We attribute this observation to the fact that LD shows the least intense LiF peak, as well as the absence of the Li 2 O peak, in the corresponding XPS spectra (Figure 5b,f). Therefore, in line with our previous work, 36 we suggest that larger combined magnitude of R HF , R MF , and R LF indicates higher charge transfer resistance. Since the perovskite layer and ETL are not subject to variation in this work, the changes in R MF and R LF can be mainly attributed to the injection barrier at the perovskite/HTL interface.…”

Section: Resultssupporting

confidence: 93%

“…There has been some controversy over the use of HI to gauge the performance of PSCs, as this metric is calculated based on parameters that are interdependent and therefore is not a reflection of what truly affects PSC hysteresis behavior. In particular, in our previous work, we demonstrated how despite similar HI, the phenomenon of hysteresis can take place at a different locus in J–V curves, which is indicative of the band alignment for a given scan direction under which the rate of nonradiative recombination is enhanced. Consequently, we find the analysis of the hysteresis locus and changes in PV metrics between RS and FS, instead of HI, to be a better approach in understanding the charge carrier phenomenon in PSCs.…”

Section: Resultsmentioning

confidence: 76%

“…The ETL is deposited through hydrothermal growth of rutile titania nanorods over an anatase seed layer (deposited via spray pyrolysis), which will be nominally denoted as AR (for FTO-Anatase−Rutile). 36 Both the perovskite layer, with the composition of (Cs 5 Rb 5 MA 0.15 FA 0.75 )Pb(I 0.83 Br 0.17 ) 3 , and the HTL (spiro-OMeTAD) are deposited using spin-coating. All studied HTL films contain LiTFSI and 4-tbp as additives.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, we employed the n–i–p device architecture of FTO/ETL/perovskite/HTL/metal contact, as schematically shown in Figure a. The ETL is deposited through hydrothermal growth of rutile titania nanorods over an anatase seed layer (deposited via spray pyrolysis), which will be nominally denoted as AR (for FTO- A natase– R utile) . Both the perovskite layer, with the composition of (Cs 5 Rb 5 MA 0.15 FA 0.75 )Pb(I 0.83 Br 0.17 ) 3 , and the HTL (spiro-OMeTAD) are deposited using spin-coating.…”

Section: Resultsmentioning

confidence: 99%

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Impact of Photo-Induced Doping of Spiro-OMeTAD as HTL on Perovskite Solar Cell Hysteresis Dynamics

Yekani,

Wang,

Ghamari

et al. 2024

J. Phys. Chem. C

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The doping strategy employed for enhancing the hole conductivity of spiro-OMeTAD as a hole transport layer (HTL) in perovskite solar cells (PSCs) is rarely specified in the literature. However, as revealed in this work, the specifics of the doping process with respect to the type of storage and its duration can have important consequences for the evolution of hysteresis dynamics in PSCs. The variability in photovoltaic metrics and hysteresis loci in current−voltage (J−V) curves are studied before and after light soaking, as well as at different scan rates, to determine operational differences as a result of a given doping process. With the aid of X-ray photoelectron spectroscopy (XPS) results showing the formation of deleterious compounds such as Li 2 O and LiF, next to proposed operational band alignments, the evolution of hysteresis trends for different doping strategies is explained. Finally, utilizing electrochemical impedance spectroscopy (EIS), signatures of HTL bulk and interfacial conductivity modulation are identified. The propagation of a third semicircle in the low-frequency part of the Nyquist plot is ascribed to performance loss caused by unfavorable interfacial electrochemical reactions, while the shrinkage of the high-frequency arc is linked with performance gain due to increased HTL bulk conductivity. This work underlines the important correlation between the spiro-OMeTAD doping strategy with hysteresis evolution as well as loss and gain in PSC performance under operational conditions.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Impact of Photo-Induced Doping of Spiro-OMeTAD as HTL on Perovskite Solar Cell Hysteresis Dynamics

Yekani,

Wang,

Ghamari

et al. 2024

J. Phys. Chem. C

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“…The assessment of hysteresis with IS has been discussed in recent studies. [19,42,43] Gonzales et al, formulated a general model to correlate IS data and device hysteresis at different voltages of the J-V curve in PSCs. [42] The model was used to evaluate hysteresis via the impedance parameters and track transitions between capacitive and inductive domains at low and high voltages, respectively.…”

Section: Dark Measurement At Different DC Biasesmentioning

confidence: 99%

Beyond Protocols: Understanding the Electrical Behavior of Perovskite Solar Cells by Impedance Spectroscopy

Ghahremanirad

Almora

Drew

et al. 2023

Advanced Energy Materials

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Impedance spectroscopy (IS) is an effective characterization technique used to probe and distinguish charge dynamics occurring at different timescales in optoelectronic and electric devices. With the rapid rise of research being conducted on perovskite solar cells (PSCs), IS has significantly contributed to the understanding of their device performance and degradation mechanisms, including metastable effects such as current–voltage hysteresis. The ionic–electronic behavior of PSCs and the presence of a wide variety of perovskite compositions and cell architectures add complexity to the accurate interpretation of the physical processes occurring in these devices. In this review, the most common IS protocols are explained to help perform accurate impedance measurements on PSC devices. It critically reviews the most commonly used equivalent circuits alongside drift‐diffusion modeling as a complementary technique to analyze the impedance response of PSCs. As an emerging method for characterizing the interfacial recombination between the perovskite layer and selective contacts, light intensity modulated impedance spectroscopy technique is further discussed. Lastly, important works on the application of IS measurement protocols for PSCs are summarized followed by a detailed discussion, providing a critical perspective and outlook on the growing topic of IS on PSCs.

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Hysteresis, Impedance, and Transients Effects in Halide Perovskite Solar Cells and Memory Devices Analysis by Neuron‐Style Models

Bisquert

2024

Advanced Energy Materials

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Halide perovskites are at the forefront of active research in many applications, such as high performance solar cells, photodetectors, and synapses and neurons for neuromorphic computation. As a result of ion transport and ionic‐electronic interactions, current and recombination are influenced by delay and memory effects that cause hysteresis of current–voltage curves and long switching times. A methodology to formulate device models is shown, in which the conduction and recombination electronic variables are influenced by internal state variables. The models are inspired in biological frameworks of the Hodgkin–Huxley class of models. Here, the theoretical precedents, the main physical components of the models, and their application to describe dynamical measurements in halide perovskite devices are summarized. The application of several measurement methods is analyzed, as the current–voltage curves at different scan rates, the impedance spectroscopy response, and the time transients. The transition from normal (capacitive) to inverted (inductive) hysteresis, and the convergence of current–voltage curves to a stable value, are described. It is proposed that neuron‐style models capture dynamical complexity with a favorable economy of parameters, toward the identification of the dominant global dynamic processes across a wide voltage span that determines the practical response of different types of devices.

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Correlation between hysteresis dynamics and inductance in hybrid perovskite solar cells: studying the dependency on ETL/perovskite interfaces

Abstract: In this study, to elucidate origin of inductance and its relation to the phenomenon of hysteresis in hybrid perovskite solar cells (PSCs), two electron transport layer (ETL) structures are utilized:...

Cited by 6 publications

References 55 publications

Impact of Photo-Induced Doping of Spiro-OMeTAD as HTL on Perovskite Solar Cell Hysteresis Dynamics

Impact of Photo-Induced Doping of Spiro-OMeTAD as HTL on Perovskite Solar Cell Hysteresis Dynamics

Beyond Protocols: Understanding the Electrical Behavior of Perovskite Solar Cells by Impedance Spectroscopy

Hysteresis, Impedance, and Transients Effects in Halide Perovskite Solar Cells and Memory Devices Analysis by Neuron‐Style Models

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