Roles of Sn content in physical features and charge transportation mechanism of Pb-Sn binary perovskite solar cells

Badrooj, Mohammad; Jamali‐Sheini, Farid; Torabi, Naeimeh

doi:10.1016/j.solener.2020.09.019

Cited by 17 publications

(10 citation statements)

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“…These conditions along with the effects of increasing Sn concentration on the morphology of the active layer caused a decreasing trend for cell yields from 16.83% for CH 3 NH 3 PbI 3 to 0.86% for CH 3 NH 3 SnI 3 with a gradual increase in x value. In this section of the present research, we tried to investigate the I – V characteristics of these cells under dark conditions and to provide a comprehensive view of the electrical and photovoltaic properties of mixed Sn/Pb perovskite cells according to the conclusions of our previous study . In the first step, the I – V characteristic of cells with different concentrations of Sn was measured under dark conditions, as shown in Figure .…”

Section: Resultsmentioning

confidence: 98%

“…This barrier is equivalent to the difference in electrostatic potentials on both sides of this junction, which is obtained using eq where N A and N D are on the p-side (perovskite layer) and n-side (TiO 2 layer), respectively, n i is the intrinsic carrier density of a semiconductor, K is Boltzmann’s constant, T is the temperature, and q is the electric charge. The previous study by this group showed that on increasing Sn concentration in CH 3 NH 3 Sn x Pb 1– x I 3 compounds, N A values decreased significantly and as a result, W and V bi values show a downward trend. Reducing V bi reduces the electrostatic potential difference throughout the depleted zone and reduces the difference in the work functions of the p-side and the n-side of the junction.…”

Section: Resultsmentioning

confidence: 99%

“…It is clear that with increasing Sn concentration, μ values increase significantly (from x = 0 to 1, more than a 10-time increase). Since on increasing Sn concentration the density of carriers in the perovskite layer decreases sharply, so the probability of carrier scattering processes, at a constant temperature, decreases, upon which the increasing trend of μ observed in cells is expected.…”

Section: Resultsmentioning

confidence: 99%

“…This information can also be very helpful in justifying the behavior of cells when exposed to light. In our previous study, 18 the electrical characterization of CH 3 NH 3 Sn x Pb 1−x I 3 [0 ≤ x ≤ 1] PSCs showed that increasing the concentration of Sn ions in the perovskite structure changes the electrical conductivity behavior from p-type to n-type, which leads to a decrease in the performance of photovoltaic parameters of cells from J sc = 38.52 mA•cm −2 and V oc = 0.91 V for CH 3 NH 3 PbI 3 to J sc = 3.75 mA•cm −2 and V oc = 0.51 V for CH 3 NH 3 SnI 3 . These conditions along with the effects of increasing Sn concentration on the morphology of the active layer caused a decreasing trend for cell yields from 16.83% for CH 3 NH 3 PbI 3 to 0.86% for CH 3 NH 3 SnI 3 with a gradual increase in x value.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…2 Meanwhile, perovskite materials with a much wider band gap, from 1.80 eV for FA 0.83 Cs 0.17 PbI 0.5 Br 0.5 to 1.60 eV for FA 0.79 MA 0.16 Cs 0.05 Pb (I 0.83 Br 0.17 ) 3 , were successfully synthesized and used as the absorber layer in perovskite tandem solar cells. In the previous study by this group, 18 the physical properties and charge transport mechanism of CH 3 NH 3 Sn x Pb 1−x I 3 [0 ≤ x ≤ 1] PSCs under light irradiation were reported. Following this research, in the present study, the optical and electrical properties of these solar cells under dark conditions were studied.…”

Section: ■ Introductionmentioning

confidence: 99%

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Optoelectronic Properties of Mixed Sn/Pb Perovskite Solar Cells: The Study of Compressive Strain by Raman Modes

2020

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Mixed Sn/Pb perovskite solar cells offer a suitable alternative pathway to reduce lead toxicity and regulate optical band gap and therefore have significant potential for the development of clean and renewable energy technologies. In this study, the optical and electrical properties of CH 3 NH 3 Sn x Pb 1−x I 3 [0 ≤ x ≤ 1] solar cells under dark conditions were investigated. The compressive strain values of perovskite layers were measured and reported by analyzing the shift of their active Raman modes. Electrical characterizations under dark conditions showed that the values of the threshold voltage (V th ) and inverse saturation current (I 0 ) of the cells decrease and increase with increasing Sn concentration, respectively. Examination of the behavior of the space charge limited current (SCLC) of cells showed that the presence of Sn atoms increases the ability of the electrical carrier mobility (μ) of cells. Based on the results and calculations, the charge transport mechanism indices including the ideality factor (n), trap-filled limit voltage (V TFL ), trap-state density (n trap ), and the lifetime of minor carriers (τ n ) in each of the samples were characterized and reported.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Optoelectronic Properties of Mixed Sn/Pb Perovskite Solar Cells: The Study of Compressive Strain by Raman Modes

2020

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Filterless Near‐Infrared Narrowband Photodetectors Based on Mixed Metal Perovskite Single Crystals

Liu,

Chen,

Zhou

et al. 2024

Advanced Optical Materials

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Iodine‐based Sn‐Pb mixed perovskite single crystals (SCs) are promising candidates for near‐infrared (NIR) narrowband photodetectors due to their low bandgaps. However, they are highly defective when grown in ambient air due to the extremely poor air stability of Sn2+ ions in precursor solutions. It is discovered that the oxidation of Sn2+ to Sn4+ ions not only consumes Sn2+ ions but also increases the precursor solution viscosity. The increased viscosity slows down the solute diffusion and hinders the anisotropic growth of SCs, leading to Sn‐Pb perovskite SCs with curved convex surfaces and unevenly distributed composition. By preventing the solute‐diffusion‐limited growth mode with hypophosphorous acid (H3PO2), high‐quality Sn‐Pb perovskite SCs can be robustly grown in ambient air with low trap density of 6.58 × 109 cm−3 and high carrier mobility‐lifetime product (µτ) of 1.5 × 10−3 cm2 V−1. Accordingly, a series of filterless NIR narrowband photodetectors with gradually tuned detection centers and dual detection modes has been achieved, delivering a maximum external quantum efficiency of 15.2% and detectivity of 1.19 × 1010 Jones.

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Design and numerical simulation of highly efficient mixed‐organic cation mixed‐metal cation perovskite solar cells

Alzahrani

Kanoun

Kanoun³

et al. 2022

Intl J of Energy Research

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Summary Mixed cation perovskite type materials have recently shown considerable potential in high‐efficiency single‐ and multi‐junction solar cell devices. However, the operating principles of multiple cation‐based perovskite solar cells are currently poorly understood. Furthermore, the photovoltaic performances of mixed cations‐based perovskites solar cells are investigated using device simulator program. Inorganic TiO2 and Cu2O were used as electron transport layer and hole transport layer, respectively, because of their better performance. The impact of thickness, doping concentration and density of defect is examined using on the device performance. In addition, the effect of band offsets on performance was also investigated through altering the electron affinity of interface layers. Our calculated results reveal that a 700 nm absorber thickness is appropriate for a good solar cell device. Furthermore, impressive cell efficiency findings were obtained by adjusting defect density (1015‐1016 cm−3) of the mixed perovskite active layer. The optimum conduction and valence band offsets, respectively, were determined to be 0.1 to 0.4 eV and 0.1 to 0.1 eV, allowing for a good performance of mixed perovskite devices. As an alternative to typical halide perovskite solar cells, our findings can be utilized to design and construct efficient mixed cations perovskite solar cell devices.

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Roles of Sn content in physical features and charge transportation mechanism of Pb-Sn binary perovskite solar cells

Cited by 17 publications

References 53 publications

Optoelectronic Properties of Mixed Sn/Pb Perovskite Solar Cells: The Study of Compressive Strain by Raman Modes

Optoelectronic Properties of Mixed Sn/Pb Perovskite Solar Cells: The Study of Compressive Strain by Raman Modes

Filterless Near‐Infrared Narrowband Photodetectors Based on Mixed Metal Perovskite Single Crystals

Design and numerical simulation of highly efficient mixed‐organic cation mixed‐metal cation perovskite solar cells

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