Analysis of the Hysteresis Behavior of Perovskite Solar Cells with Interfacial Fullerene Self-Assembled Monolayers

Vallés‐Pelarda, Marta; Hames, Bruno Clasen; García‐Benito, Inés; Almora, Osbel; Molina‐Ontoria, Agustín; Sánchez, Rafael Sánchez; García-Belmonte, Germà; Martı́n, Nazario; Mora‐Seró, Iván

doi:10.1021/acs.jpclett.6b02103

Cited by 72 publications

(72 citation statements)

References 30 publications

(65 reference statements)

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“…The hysteresis effect has been ubiquitouslyo bserved in perovskite solar cells and its origins are generally related to the presence of traps, ion motion and even ferroelectric effects. [36][37][38] With the passivation of surface traps by DMBG, it is interesting to examine the hysteresis in our perovskite solar cells. For this purpose, we recorded J-V characteristics of CH 3 rections are summarized in Ta ble 2.…”

Section: Resultsmentioning

confidence: 99%

Retardation of Trap‐Assisted Recombination in Lead Halide Perovskite Solar Cells by a Dimethylbiguanide Anchor Layer

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You

et al. 2018

Chemistry A European J

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Reaching the full potential of solar cells based on photo‐absorbers of organic‐inorganic hybrid perovskites requires highly efficient charge extraction at the interface between perovskite and charge transporting layer. This demand is generally challenged by the presence of under‐coordinated metal or halogen ions, causing surface charge trapping and resultant recombination losses. These problems can be tackled by introducing a small molecule interfacial anchor layer based on dimethylbiguanide (DMBG). Benefitting from interactions between the nitrogen‐containing functional groups in DMBG and unsaturated ions in CH3NH3PbI3 perovskites, the electron extraction of TiO2 is dramatically improved in association with reduced Schottky–Read–Hall recombination, as revealed by photoluminescence spectroscopy. As a consequence, the power conversion efficiency of CH3NH3PbI3 solar cells is boosted from 17.14 to 19.1 %, showing appreciably reduced hysteresis. The demonstrated molecular strategy based on DMBG enables one to achieve meliorations on key figures of merit in halide perovskite solar cells with improved stability.

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Section: Resultsmentioning

confidence: 99%

Retardation of Trap‐Assisted Recombination in Lead Halide Perovskite Solar Cells by a Dimethylbiguanide Anchor Layer

Xue

You

et al. 2018

Chemistry A European J

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“…More recently, an increasing number of studies indicate enhanced PCEs in connection with a diminished or even hysteresis-free behavior. This is typically achieved by improving the electron extraction and by reducing the number of surface traps, employing fullerene derivatives [6][7][8], electron selective layers such as SnO 2 [9][10][11] or ZnO [12], by optimizing the growth of the perovskite active layer [13,14], by impurity co-doping of the electron transfer layer [15] or of the perovskite absorber [16]. However, in general, as the employed measurement procedures are rather different and, in some cases, insufficiently controlled or specified, it is quite difficult to assess and compare the potential hysteretic effects: to what extent the hysteretic effects or their absence are truly related to fabrication methods or are a consequence of the measurement conditions?…”

Section: Introductionmentioning

confidence: 99%

How measurement protocols influence the dynamic J-V characteristics of perovskite solar cells: Theory and experiment

et al. 2018

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The dynamic effects observed in the J-V measurements represent one important hallmark in the behavior of the perovskite solar cells. Proper measurement protocols (MPs) should be employed for the experimental data reproducibility, in particular for a reliable evaluation of the power conversion efficiency (PCE), as well as for a meaningful characterization of the type and magnitude of the hysteresis. We discuss here several MPs by comparing the experimental J-V characteristics with simulated ones using the dynamic electrical model (DEM). Pre-poling conditions and bias scan rate can have a dramatic influence not only on the apparent solar cell performance, but also on the hysteretic phenomena. Under certain measurement conditions, a hysteresis-free behavior with relatively high PCEs may be observed, although the J-V characteristics may be far away from the stationary case. Furthermore, forward-reverse and reverse-forward bias scans show qualitatively different behaviors regarding the type of the hysteresis, normal and inverted, depending on the bias pre-poling. We emphasize here that correlated double-scans, forward-reverse or reverseforward, where the second scan is conducted in the opposite sweep direction and begins immediately after the first scan is complete, are essential for a correct assessment of the dynamic hysteresis. In this context, we define a hysteresis index which consistently assigns the hysteresis type and magnitude. Our DEM simulations, supported by experimental data, provide further guidance for an efficient and accurate determination of the stationary J-V characteristics, showing that the type and magnitude of the dynamic hysteresis may be affected by unintentional pre-conditioning in typical experiments.

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“…Hysteresis index (HI) is calculated according to ref. :

HI = \frac{J_{RS} (0.8 V_{OC}) - J_{FS} (0.8 V_{OC})}{J_{RS} (0.8 V_{OC})}

. Interestingly, the GdF 3 –aminobutanol‐based device shows the smallest hysteresis index of 0.016, while the hysteresis index of pristine one is 0.090.…”

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confidence: 98%

Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High‐Performance and Stable Perovskite Solar Cells

et al. 2019

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As one kind of promising next‐generation photovoltaic devices, perovskite solar cells (PVSCs) have experienced unprecedented rapid growth in device performance over the past few years. However, the practical applications of PVSCs require much improved device long‐term stability and performance, and internal defects and external humidity sensitivity are two key limitation need to be overcome. Here, gadolinium fluoride (GdF3) is added into perovskite precursor as a redox shuttle and growth‐assist; meanwhile, aminobutanol vapor is used for Ostwald ripening in the formation of the perovskite layer. Consequently, a high‐quality perovskite film with large grain size and few grain boundaries is obtained, resulting in the reduction of trap state density and carrier recombination. As a result, a power conversion efficiency of 21.21% is achieved with superior stability and negligible hysteresis.

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Analysis of the Hysteresis Behavior of Perovskite Solar Cells with Interfacial Fullerene Self-Assembled Monolayers

Abstract: ABSTRACT:The use of self-assembled monolayers (SAMs) of fullerene derivatives reduces 11 the hysteresis of perovskite solar cells (PSCs

Cited by 72 publications

References 30 publications

Retardation of Trap‐Assisted Recombination in Lead Halide Perovskite Solar Cells by a Dimethylbiguanide Anchor Layer

Retardation of Trap‐Assisted Recombination in Lead Halide Perovskite Solar Cells by a Dimethylbiguanide Anchor Layer

How measurement protocols influence the dynamic J-V characteristics of perovskite solar cells: Theory and experiment

Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High‐Performance and Stable Perovskite Solar Cells

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