Planar CH3NH3PbI3 Perovskite Solar Cells with Constant 17.2% Average Power Conversion Efficiency Irrespective of the Scan Rate

Heo, Jin Hyuck; Song, Dae Ho; Han, Hyo Kyung; Kim, Seong Yeon; Kim, Jun Ho; Kim, Dasom; Shin, Hee Won; Ahn, Tae Kyu; Wolf, Christoph; Lee, Tae Woo; Im, Sang Hyuk

doi:10.1002/adma.201500048

Cited by 440 publications

(219 citation statements)

References 30 publications

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“…To date, many reasons have been indicated to be the causes of hysteresis behavior, such as ion migration and transient ferroelectric polarization [44]. On the other hand, any factor disadvantageous to charge transfer kinetic processes can also result in pronounced hysteresis, like serious charge recombination, slow transport, and less efficient interfacial charge extraction [45,46]. Herein we focus specifically on revealing the influence of ETL underlayer on the hysteresis behavior.…”

Section: Resultsmentioning

confidence: 98%

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

et al. 2017

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Here, the interfacial synergism of discontinuous spot shaped SnO 2 and TiO 2 mesoporous nanocomposite as electron transfer layer (ETL) underlayer is presented in highly efficient mesoscopic perovskite solar cells (M-PSCs). Based on this new strategy, strong charge recombination observed in previous SnO 2 -based ETLs is suppressed to a great extent as the pathways of charge recombination and energy loss are blocked effectively. Meanwhile, the internal series resistance of entire M-PSC is decreased remarkably. The new ETL is more kinetically favorable to electron transfer and thus results in significant photovoltaic improvement and alleviated hysteresis effect of M-PSCs.

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Section: Resultsmentioning

confidence: 98%

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

et al. 2017

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“…Similarly, if ionic migration is responsible it is unclear as to which species are mobile, and whether it is interstitial or vacancy impurities that are responsible for the observed behavior. 22 Our work suggests that measurements of multiple types of device structures can be useful in the understanding the properties and behavior of (MA)PbI 3 and that future work on transport in field-effect devices is a fruitful complement to that on solar cells. The device had a length and width of 200µm and 2,600µm respectively and a geometric capacitance of the dielectric was 23nFcm -2 .…”

mentioning

confidence: 92%

“…In an attempt to elucidate the more likely mechanism, we carried out a set of impedance measurements on (MA)PbI 3 capacitor structures, akin to similar recent studies. 18,[21][22] The structure studied is shown in the inset to Figure 3(a). Relative permittivity was extracted from the impedance spectra using a 2-component circuit model as described in the Supporting Information, and is plotted as a function of frequency and temperature in Figure 3(a) and (b).…”

mentioning

confidence: 99%

“…Hybrid organic-inorganic perovskite solar-cells are notable for their various instabilities and measurement-dependent behavior. [18][19][20][21][22][23][24][25] These instabilities vary widely between device structures due to different processing methods, such as growth in ambient or in controlled atmospheres, and due to measurement conditions. The origins of this behavior are generally attributed to a variety of mechanisms including mass diffusion of ions, [25][26][27] structural changes, 28 and grain boundaries.…”

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confidence: 99%

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Temperature-Dependent Polarization in Field-Effect Transport and Photovoltaic Measurements of Methylammonium Lead Iodide

Labram¹,

Fabini²,

Perry³

et al. 2015

J. Phys. Chem. Lett.

111

145

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ABSTRACT:While recent improvements in the reported peak power conversion efficiency (PCE) of hybrid organic-inorganic perovskite solar cells have been truly astonishing, there are many fundamental questions about the electronic behavior of these materials. Here we have studied a set of electronic devices employing methylammonium lead iodide ((MA)PbI 3 ) as the active material and conducted a series of temperature-dependent measurements. Field-effect transistor, capacitor and photovoltaic cell measurements all reveal behavior consistent with substantial and strongly temperature-dependent polarization susceptibility in (MA)PbI 3 at temporal and spatial scales that significantly impact functional behavior. The relative PCE of (MA)PbI 3 photovoltaic cells is observed to reduce drastically with decreasing temperature, suggesting that such polarization effects could be a prerequisite for high-performance device operation. The pace at which new materials and designs for solar cells emerge is very slow, [1][2][3][4][5][6] and is arguably comparable to the discovery of high T c superconductors. [7][8] The finding that hybrid organic metal halide solar cells based on CH 3 NH 3 PbI 3 can lead to high power conversion efficiency (PCE) using simple coating methods, in a material comprising earth-abundant elements has therefore garnered significant interest. 6, 9-10 Not only has the peak reported PCE exceeded 20% in a short time, [11][12][13] but the processing techniques widely employed suggest that commercial products could be fabricated using low-cost, large-area techniques, potentially compatible with flexible substrates. 14The ABX 3 perovskite crystal structure is characterized by three-dimensionally corner connected network of BX 6/2 octahedra that is filled by the A ions. Perovskite compounds where the A is an organic cation, B is usually a main group element, and X is a group 7 anion (halide) We found that the electrical characteristics of (MA)PbI 3 had a complex temperature dependence. At room temperature these devices exhibit low source-drain currents and no fieldinduced current modulation (see Figure 1(a)). However when the temperature is reduced below 220K, a field-effect is observed and the drain current continues to increase as the temperature is reduced. Where the drain current is observed to be substantially in excess of gate current the gradual-channel approximation 44 has been applied to extract a value of field-effect mobility. The gradual channel approximation for extraction of carrier mobility in field-effect devices assumes a single electronic charge carrier, uniform carrier accumulation in the channel, and timeindependent behavior and consequently does not provide a simple estimation of the carrier motion for measurements with non-ideal effects. This is consistent with our observation of absolute values of electron mobility substantially lower than those previously reported using other techniques. 16 Nonetheless it can be applied as a proxy for relative transistor performance, assuming a high transcondu...

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“…In this regard, combination of solvent and dopants have been tested, such as: the introduction of different source of metal or the solvent, the utilization of single or mixed solvent,19, 20 a variety of lead salt precursors,21, 22 as well as so‐called engineering step23 or the exotic additive: ionic liquid,24 Lewis base25, 26, 27 or other organic and inorganic additives (MACl,28 Guanidinium,29 water,30, 31 H 3 PO 2 ,32, 33 1,8‐diiodooctane (DIO),34 1‐chloronaphthalene (CN),35 hydroiodic acid (HI),36, 37 aluminum acetylacetonate (Al‐acac 3 ),38 LiI,39 Na + 40 etc. ), which induce the nucleation and crystallization process of perovskite thin films.…”

Section: Introductionmentioning

confidence: 99%

Alkali Metal Doping for Improved CH₃NH₃PbI₃ Perovskite Solar Cells

et al. 2017

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Organic–inorganic hybrid halide perovskites are proven to be a promising semiconductor material as the absorber layer of solar cells. However, the perovskite films always suffer from nonuniform coverage or high trap state density due to the polycrystalline characteristics, which degrade the photoelectric properties of thin films. Herein, the alkali metal ions which are stable against oxidation and reduction are used in the perovskite precursor solution to induce the process of crystallization and nucleation, then affect the properties of the perovskite film. It is found that the addition of the alkali metal ions clearly improves the quality of perovskite film: enlarges the grain sizes, reduces the defect state density, passivates the grain boundaries, increases the built‐in potential (V bi), resulting to the enhancement in the power conversion efficiency of perovskite thin film solar cell.

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Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Constant 17.2% Average Power Conversion Efficiency Irrespective of the Scan Rate

Cited by 440 publications

References 30 publications

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

Temperature-Dependent Polarization in Field-Effect Transport and Photovoltaic Measurements of Methylammonium Lead Iodide

Alkali Metal Doping for Improved CH₃NH₃PbI₃ Perovskite Solar Cells

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Planar CH3NH3PbI3 Perovskite Solar Cells with Constant 17.2% Average Power Conversion Efficiency Irrespective of the Scan Rate

Cited by 440 publications

References 30 publications

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

Temperature-Dependent Polarization in Field-Effect Transport and Photovoltaic Measurements of Methylammonium Lead Iodide

Alkali Metal Doping for Improved CH3NH3PbI3 Perovskite Solar Cells

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Product

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Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Constant 17.2% Average Power Conversion Efficiency Irrespective of the Scan Rate

Alkali Metal Doping for Improved CH₃NH₃PbI₃ Perovskite Solar Cells