Evaluating the Capacitive Response in Metal Halide Perovskite Solar Cells

Khan, Mohd Taukeer; Khan, Firoz; Al‐Ahmed, Amir; Ahmad, Shahzada; Al‐Sulaiman, Fahad A.

doi:10.1002/tcr.202100330

Cited by 21 publications

(12 citation statements)

References 121 publications

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“…The opposite is true if we apply a positive voltage at the gold contact, Figure 4B. The capacitive and inductive effects of these ions at the interfaces can be monitored by IS (Guerrero et al, 2021;Berruet et al, 2022;Taukeer Khan et al, 2022) as discussed in the latter sections.…”

Section: Hysteresis Of Current-voltagementioning

confidence: 99%

Inductive and Capacitive Hysteresis of Halide Perovskite Solar Cells and Memristors Under Illumination

et al. 2022

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The current–voltage curves of memristors exhibit significant hysteresis effects of use for information storage and computing. Here, we provide a comparison of different devices based on MAPbI3 perovskite with different contact configurations, from a 15% efficient solar cell to a pure memristor that lacks directional photocurrent. Current–voltage curves and impedance spectroscopy give insights into the different types of hysteresis, photocapacitance, and inductance present in halide perovskites. It is shown that both halide perovskite memristors and solar cells show a large inverted hysteresis effect at the forward bias that is related to the presence of a chemical inductor component in the equivalent circuit. Based on the results, we classify the observed response according to recombination current in devices with selective contacts, to voltage-activated single-carrier device conduction in devices with symmetric contacts. These findings serve to gain an understanding of the mechanism of memristor currents in mixed ionic-electronic conductors such as halide perovskites. We establish the link in the electrical response between solar cells and memristors.

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Section: Hysteresis Of Current-voltagementioning

confidence: 99%

Inductive and Capacitive Hysteresis of Halide Perovskite Solar Cells and Memristors Under Illumination

et al. 2022

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“…IS has been extensively applied to halide perovskites in the last decade and the matter has been extensively reviewed. [ 29,40 ] The distinct types of capacitance present in halide perovskites have been well understood [ 41 ] and they will be used below to build the equivalent circuit models.…”

Section: The Transfer Functions Of Frequency Resolved Measurementsmentioning

confidence: 99%

Radiative Recombination Processes in Halide Perovskites Observed by Light Emission Voltage Modulated Spectroscopy

et al. 2023

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and discharge of the carriers at the contact layers; [12,[25][26][27] however, these phenomena are currently not very well understood.The light emission kinetics in perovskite LEDs and in organic light-emitting diodes (OLEDs) is usually investigated using a range of steady-state and timeresolved methods. [26,28] Remarkably, frequency-resolved methods such as impedance spectroscopy (IS) are highly effective for the separation of concomitant kinetic phenomena. [29] The connection between time transients and light-stimulated frequency methods in halide perovskite has been reviewed recently. [30] Here, we explore a new experimental measuring technique that can provide significant information about recombination in high-performance solar cells and LEDs. We analyze the frequency-resolved light emission with respect to an applied modu lated voltage, that we denote light emission voltage modulated spectroscopy (LEVS). The main point of this investigation is to reveal significant features of the radiative charge recombination that are difficult to be discerned in other measurement techniques. [30] This methodology will be especially useful when the radiative recombination event is convoluted with previous electronic carrier steps such as transport, trapping, or contact polarization effects, and/or ionic-related phenomena. It has previously been remarked that the capacitance and luminance of LEDs show correlated features [21,31,32] and some studies of electrically stimulated light emission spectroscopy have been reported, [33][34][35] but unfortunately, a general methodology has not been fully developed.Here we describe the first LEVS experiments in halide perovskite LEDs and establish an equivalent circuit model to understand the observed spectra, based on the previous experience in IS. We show that the method provides unique information on the recombination processes that cannot be accessed by purely electrical techniques, thus highlighting the interest of this new experimental technique for the characterization of optoelectronic devices, especially those presenting multiple physical phenomena, as it is the case of halide perovskite-based systems. The Transfer Functions of Frequency Resolved Measurements IS is a general-purpose characterization technique that is used in a large variety of fields to extract dynamic information on anyThe kinetics of light emission in halide perovskite light-emitting diodes (LEDs) and solar cells is composed of a radiative recombination of voltage-injected carriers mediated by additional steps such as carrier trapping, redistribution of injected carriers, and photon recycling that affect the observed luminescence decays. These processes are investigated in high-performance halide perovskite LEDs, with external quantum efficiency (EQE) and luminance values higher than 20% and 80 000 Cd m −2 , by measuring the frequency-resolved emitted light with respect to modulated voltage through a new methodology termed light emission voltage modulated spectroscopy (LEVS). The spectra are shown to provid...

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“…Over the past years, EIS has revealed several eccentric behaviors including giant photo‐induced low‐frequency (LF) capacitance, inductive loop at mid‐frequencies, and negative capacitance, however, the origin of these phenomena has still not been conclusively understood. [ 21–23 ] Studies have been devoted to a deeper understanding of these prevailing features, which play important roles in the improvement of the PSCs performance. [ 24–27 ] The low‐frequency negative capacitance and its correlation to slow transients in the injection current have been studied.…”

Section: Introductionmentioning

confidence: 99%

Impact of Polymeric Hole‐Selective Layers on Chemical Inductance in Inverted Perovskite Solar Cells

et al. 2022

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An essential role is played by the charge selective layers, in particular, the hole transport layer (HTL) in determining the performance of perovskite solar cells (PSCs). HTLs contribution is even more substantial in the inverted PSCs (p-i-n) as it also affects the crystallization process of the overlayer perovskite deposition. We probed the influence of HTL on inverted PSCs and quantify the role through admittance spectroscopy, and established the photovoltaic performance correlation with the microstructure of the perovskite. By measuring the lowfrequency impedance responses of inverted PSCs, we quantify the photo-induced charge transfer dynamics in the PSCs, revealing negative chemical inductor features at low frequencies in the Nyquist plots. The noted additional recombination pathways are attributed to the ionic vacancies in the interfacial states. The PSCs fabricated with PTAA showed a higher opencircuit voltage, lower recombination, and higher charge carrier lifetime. We supported the chemical inductance behavior through variable temperature frequency-dependent capacitance measurements.

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Evaluating the Capacitive Response in Metal Halide Perovskite Solar Cells

Cited by 21 publications

References 121 publications

Inductive and Capacitive Hysteresis of Halide Perovskite Solar Cells and Memristors Under Illumination

Inductive and Capacitive Hysteresis of Halide Perovskite Solar Cells and Memristors Under Illumination

Radiative Recombination Processes in Halide Perovskites Observed by Light Emission Voltage Modulated Spectroscopy

Impact of Polymeric Hole‐Selective Layers on Chemical Inductance in Inverted Perovskite Solar Cells

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